[
  {
    "sku": "C3136-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3136 K",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1250,
    "static_load_kN": 1730,
    "fatigue_load_limit_kN": 156,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 26500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3136 K denotes a toroidal roller bearing whose 96 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (36) encode the 180 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 180 mm shaft deflects; the 1,700 r/min reference and 2,400 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3136 K deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 180 mm bore, shaft expansion is already measurable: calculate the required float inside the 96 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 180 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 1,700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 3136 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 1250/1730 kN ratings belong to this exact execution (C 3136 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 1250/1730 kN ratings and 26500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 3136 K have?",
        "a": "A C 3136 K measures 180 mm bore × 300 mm outside diameter × 96 mm width (7.087 × 11.811 × 3.78 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1250 kN, static C0 1730 kN, fatigue limit Pu 156 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 26500 g."
      },
      {
        "q": "What does C 3136 K mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 180 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3136 K used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3136 K sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3136",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×300×96 mm ISO 15 envelope and equivalent catalogue C/C0; C 3136 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23136",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (180×300×96 mm) SKF spherical roller bearing SKF 23136 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23136 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23136-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (180×300×96 mm) SKF spherical roller bearing SKF 23136 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23136 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3136-K",
      "C 3136 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C4136-V",
    "brand": "SKF",
    "manufacturer_designation": "C 4136 V",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1760,
    "static_load_kN": 2700,
    "fatigue_load_limit_kN": 240,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "weight_g": 34500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 4136 V belongs to the CARB family — compact aligning roller bearings: envelope 180×300×118 mm, radial rating 1760/2700 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 4136 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here V. The cylindrical 180 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 180×300×118 mm are identical — only the mounting method changes. The 34500 g mass over the 180×300×118 mm envelope yields about 9.78 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 118 mm wide cavity does not fill itself.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 180 mm bore, shaft expansion is already measurable: calculate the required float inside the 118 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4136 V must float; the two are designed to be used as a pair.",
      "Never use C 4136 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 180 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 1760/2700 kN ratings and 34500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 4136 V mean in SKF part numbering?",
        "a": "C marks CARB; 41 the dimension series; the size code gives 180 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 4136 V used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 4136 V sealed?",
        "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24136",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×300×118 mm envelope as the SKF spherical roller bearing SKF 24136 CC/W33, but catalogue C/C0 differ (1760/2700 kN vs 1449/2160 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "24136-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×300×118 mm envelope as the SKF spherical roller bearing SKF 24136 CCK30/W33, but catalogue C/C0 differ (1760/2700 kN vs 1449/2160 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C4136-V",
      "C 4136 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3236",
    "brand": "SKF",
    "manufacturer_designation": "C 3236",
    "series": "C3200-series",
    "type": "carb_toroidal",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1530,
    "static_load_kN": 2200,
    "fatigue_load_limit_kN": 193,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 38000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3236 belongs to the CARB family — compact aligning roller bearings: envelope 180×320×112 mm, radial rating 1530/2200 kN C/C0, and no axial-locating function by design. The designation C 3236 separates into C (CARB), 32 (dimension series), 36 (180 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 180×320×112 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 180 mm shaft deflects; the 1,500 r/min reference and 2,000 r/min limiting speed are both catalogue values. The 38000 g mass over the 180×320×112 mm envelope yields about 8.50 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 180 mm bore, shaft expansion is already measurable: calculate the required float inside the 112 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "Never use C 3236 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 180 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3236 must float; the two are designed to be used as a pair.",
      "The 1530/2200 kN ratings and 38000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 3236 locate the shaft axially?",
        "a": "No — that is the defining feature. C 3236 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3236 designation read?",
        "a": "C = CARB toroidal family; 32 = dimension series; 36 = 180 mm bore (code 36 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (1530 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3236 is the cylindrical bore for direct shaft fitting, pressed steel cage."
      },
      {
        "q": "How is C 3236 mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 180 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 112 mm roller set."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3236-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×320×112 mm ISO 15 envelope and equivalent catalogue C/C0; C 3236 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23236",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (180×320×112 mm) SKF spherical roller bearing SKF 23236 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23236 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23236-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (180×320×112 mm) SKF spherical roller bearing SKF 23236 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23236 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3236",
      "C 3236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3236-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3236 K",
    "series": "C3200-series",
    "type": "carb_toroidal",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1530,
    "static_load_kN": 2200,
    "fatigue_load_limit_kN": 193,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 38000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3236 K: the toroidal rollers allow the 180 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. The designation C 3236 K separates into C (CARB), 32 (dimension series), 36 (180 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 180×320×112 mm follows the ISO 15 plan. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 180×320 mm size with 1530 kN dynamic and a 1,500 r/min reference speed. The 38000 g mass over the 180×320×112 mm envelope yields about 8.50 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 112 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 180 mm bore, shaft expansion is already measurable: calculate the required float inside the 112 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "Never use C 3236 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 180 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3236 K must float; the two are designed to be used as a pair.",
      "Reference and limiting speeds are different limits: the 1,500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 1530/2200 kN ratings and 38000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 3236 K locate the shaft axially?",
        "a": "No — that is the defining feature. C 3236 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3236 K designation read?",
        "a": "C = CARB toroidal family; 32 = dimension series; 36 = 180 mm bore (code 36 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (1530 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3236 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage."
      },
      {
        "q": "How is C 3236 K mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3236",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×320×112 mm ISO 15 envelope and equivalent catalogue C/C0; C 3236 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23236",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (180×320×112 mm) SKF spherical roller bearing SKF 23236 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23236 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23236-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (180×320×112 mm) SKF spherical roller bearing SKF 23236 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23236 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3236-K",
      "C 3236 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3038",
    "brand": "SKF",
    "manufacturer_designation": "C 3038",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 930,
    "static_load_kN": 1460,
    "fatigue_load_limit_kN": 132,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 17500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3038: the toroidal rollers allow the 190 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 3038 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here the bare number. The cylindrical 190 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 190×290×75 mm are identical — only the mounting method changes. Speed planning separates the 1,800 r/min thermal reference from the 2,400 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 75 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 75 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 190 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 1,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 3038 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 930/1460 kN ratings belong to this exact execution (C 3038); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 930/1460 kN ratings and 17500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3038 have?",
        "a": "A C 3038 measures 190 mm bore × 290 mm outside diameter × 75 mm width (7.48 × 11.417 × 2.953 in). From SKF catalogue PUB BU/P1 17000: dynamic C 930 kN, static C0 1460 kN, fatigue limit Pu 132 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 17500 g."
      },
      {
        "q": "What does C 3038 mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 190 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3038 used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3038-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×290×75 mm ISO 15 envelope and equivalent catalogue C/C0; C 3038 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23038",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (190×290×75 mm) SKF spherical roller bearing SKF 23038 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23038 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23038-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (190×290×75 mm) SKF spherical roller bearing SKF 23038 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23038 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3038",
      "C 3038"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3038-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3038 K",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 930,
    "static_load_kN": 1460,
    "fatigue_load_limit_kN": 132,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 17500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 3038 K combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 190 mm bore, 290 mm outside diameter, 75 mm wide unit rated 930 kN dynamic. The designation C 3038 K separates into C (CARB), 30 (dimension series), 38 (190 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 190×290×75 mm follows the ISO 15 plan. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 190×290 mm size with 930 kN dynamic and a 1,800 r/min reference speed. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 75 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 290 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 75 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "Never use C 3038 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 190 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 1,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 930/1460 kN ratings belong to this exact execution (C 3038 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 930/1460 kN ratings and 17500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 3038 K mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 3038 K?",
        "a": "A C 3038 K measures 190 mm bore × 290 mm outside diameter × 75 mm width (7.48 × 11.417 × 2.953 in). From SKF catalogue PUB BU/P1 17000: dynamic C 930 kN, static C0 1460 kN, fatigue limit Pu 132 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 17500 g."
      },
      {
        "q": "Can a CARB bearing like C 3038 K locate the shaft axially?",
        "a": "No — that is the defining feature. C 3038 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3038 K designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 38 = 190 mm bore (code 38 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3038",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×290×75 mm ISO 15 envelope and equivalent catalogue C/C0; C 3038 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23038",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (190×290×75 mm) SKF spherical roller bearing SKF 23038 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23038 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23038-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (190×290×75 mm) SKF spherical roller bearing SKF 23038 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23038 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3038-K",
      "C 3038 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3138-V",
    "brand": "SKF",
    "manufacturer_designation": "C 3138 V",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1700,
    "static_load_kN": 2550,
    "fatigue_load_limit_kN": 224,
    "limiting_speed_rpm": 190,
    "max_rpm": 190,
    "weight_g": 34000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists C 3138 V in the dimension series 31 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. In C 3138 V the 31 dimension series fixes the 320 mm OD and 104 mm width around the 190 mm bore (code 38 × 5); the suffix V then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). The cylindrical 190 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 190×320×104 mm are identical — only the mounting method changes. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 190 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 190 mm seat or heat it (max 120 °C) and seat it square; never press through the 104 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 104 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "Never use C 3138 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 190 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3138 V must float; the two are designed to be used as a pair.",
      "Reference and limiting speeds are different limits: the catalogue lists no thermal reference speed for this full-complement/sealed execution, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 1700/2550 kN ratings and 34000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 3138 V mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 190 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 104 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 3138 V?",
        "a": "A C 3138 V measures 190 mm bore × 320 mm outside diameter × 104 mm width (7.48 × 12.598 × 4.094 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1700 kN, static C0 2550 kN, fatigue limit Pu 224 kN, limiting speed 190 r/min, no reference speed listed, mass about 34000 g."
      },
      {
        "q": "Can a CARB bearing like C 3138 V locate the shaft axially?",
        "a": "No — that is the defining feature. C 3138 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3138 V designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 38 = 190 mm bore (code 38 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3138-KV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×320×104 mm ISO 15 envelope and equivalent catalogue C/C0; C 3138 KV is the 1:12 tapered-bore K full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23138",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×320×104 mm envelope as the SKF spherical roller bearing SKF 23138 CC/W33, but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23138-CCK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×320×104 mm envelope as the SKF spherical roller bearing SKF 23138 CCK/W33, but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3138-V",
      "C 3138 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3138-KV",
    "brand": "SKF",
    "manufacturer_designation": "C 3138 KV",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1700,
    "static_load_kN": 2550,
    "fatigue_load_limit_kN": 224,
    "limiting_speed_rpm": 190,
    "max_rpm": 190,
    "weight_g": 34000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists C 3138 KV in the dimension series 31 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 3138 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KV. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 190 mm seat. No thermal reference speed is listed for this full-complement execution; the mechanical limiting speed is 190 r/min. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 320 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 104 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3138 KV must float; the two are designed to be used as a pair.",
      "Never use C 3138 KV as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 1700/2550 kN ratings belong to this exact execution (C 3138 KV); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 1700/2550 kN ratings and 34000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3138 KV have?",
        "a": "A C 3138 KV measures 190 mm bore × 320 mm outside diameter × 104 mm width (7.48 × 12.598 × 4.094 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1700 kN, static C0 2550 kN, fatigue limit Pu 224 kN, limiting speed 190 r/min, no reference speed listed, mass about 34000 g."
      },
      {
        "q": "What does C 3138 KV mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 190 mm bore; KV is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3138 KV used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3138-V",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×320×104 mm ISO 15 envelope and equivalent catalogue C/C0; C 3138 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23138",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×320×104 mm envelope as the SKF spherical roller bearing SKF 23138 CC/W33, but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23138-CCK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×320×104 mm envelope as the SKF spherical roller bearing SKF 23138 CCK/W33, but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3138-KV",
      "C 3138 KV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C2238",
    "brand": "SKF",
    "manufacturer_designation": "C 2238",
    "series": "C2200-series",
    "type": "carb_toroidal",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1370,
    "static_load_kN": 1730,
    "fatigue_load_limit_kN": 153,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 34500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 2238 is the dimension series 22 CARB toroidal roller bearings member of the CARB range: 190 mm bore, 340 mm OD, 92 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (22) identify the ISO dimension series and the last two (38) encode the 190 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 190 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 92 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 92 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "The quoted 1370/1730 kN ratings belong to this exact execution (C 2238); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Reference and limiting speeds are different limits: the 1,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 2238 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 1370/1730 kN ratings and 34500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 2238 have?",
        "a": "A C 2238 measures 190 mm bore × 340 mm outside diameter × 92 mm width (7.48 × 13.386 × 3.622 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1370 kN, static C0 1730 kN, fatigue limit Pu 153 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 34500 g."
      },
      {
        "q": "What does C 2238 mean in SKF part numbering?",
        "a": "C marks CARB; 22 the dimension series; the size code gives 190 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 2238 used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C2238-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×340×92 mm ISO 15 envelope and equivalent catalogue C/C0; C 2238 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C2238",
      "C 2238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C2238-K",
    "brand": "SKF",
    "manufacturer_designation": "C 2238 K",
    "series": "C2200-series",
    "type": "carb_toroidal",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1370,
    "static_load_kN": 1730,
    "fatigue_load_limit_kN": 153,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 34500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 2238 K combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 190 mm bore, 340 mm outside diameter, 92 mm wide unit rated 1370 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 2238 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 190×340 mm size with 1370 kN dynamic and a 1,800 r/min reference speed. Speed planning separates the 1,800 r/min thermal reference from the 2,400 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 190 mm bore, shaft expansion is already measurable: calculate the required float inside the 92 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 190 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 1,800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 2238 K must float; the two are designed to be used as a pair.",
      "The 1370/1730 kN ratings and 34500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 2238 K have?",
        "a": "A C 2238 K measures 190 mm bore × 340 mm outside diameter × 92 mm width (7.48 × 13.386 × 3.622 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1370 kN, static C0 1730 kN, fatigue limit Pu 153 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 34500 g."
      },
      {
        "q": "What does C 2238 K mean in SKF part numbering?",
        "a": "C marks CARB; 22 the dimension series; the size code gives 190 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 2238 K used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C2238",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×340×92 mm ISO 15 envelope and equivalent catalogue C/C0; C 2238 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C2238-K",
      "C 2238 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3040",
    "brand": "SKF",
    "manufacturer_designation": "C 3040",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1120,
    "static_load_kN": 1730,
    "fatigue_load_limit_kN": 153,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 22500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 3040 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 200 mm bore, 310 mm outside diameter, 82 mm wide unit rated 1120 kN dynamic. The designation C 3040 separates into C (CARB), 30 (dimension series), 40 (200 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 200×310×82 mm follows the ISO 15 plan. The cylindrical 200 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 200×310×82 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3040 deliberately carries none. Mounting: slide the bearing onto the 200 mm seat or heat it (max 120 °C) and seat it square; never press through the 82 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 200 mm bore, shaft expansion is already measurable: calculate the required float inside the 82 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3040 must float; the two are designed to be used as a pair.",
      "The quoted 1120/1730 kN ratings belong to this exact execution (C 3040); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 3040 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 1120/1730 kN ratings and 22500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 3040 mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 200 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 82 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 3040?",
        "a": "A C 3040 measures 200 mm bore × 310 mm outside diameter × 82 mm width (7.874 × 12.205 × 3.228 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1120 kN, static C0 1730 kN, fatigue limit Pu 153 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 22500 g."
      },
      {
        "q": "Can a CARB bearing like C 3040 locate the shaft axially?",
        "a": "No — that is the defining feature. C 3040 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3040 designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 40 = 200 mm bore (code 40 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3040-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×310×82 mm ISO 15 envelope and equivalent catalogue C/C0; C 3040 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23040",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×310×82 mm envelope as the SKF spherical roller bearing SKF 23040 CC/W33, but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23040-CCK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×310×82 mm envelope as the SKF spherical roller bearing SKF 23040 CCK/W33, but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3040",
      "C 3040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3040-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3040 K",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1120,
    "static_load_kN": 1730,
    "fatigue_load_limit_kN": 153,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 22500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3040 K denotes a toroidal roller bearing whose 82 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 3040 K the 30 dimension series fixes the 310 mm OD and 82 mm width around the 200 mm bore (code 40 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. The K suffix gives a 1:12 tapered 200 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 200×310×82 mm are identical — only the mounting method changes. Speed planning separates the 1,700 r/min thermal reference from the 2,400 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 200 mm bore, shaft expansion is already measurable: calculate the required float inside the 82 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "Never use C 3040 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 200 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3040 K must float; the two are designed to be used as a pair.",
      "The 1120/1730 kN ratings and 22500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (1120 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3040 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage."
      },
      {
        "q": "How is C 3040 K mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 3040 K?",
        "a": "A C 3040 K measures 200 mm bore × 310 mm outside diameter × 82 mm width (7.874 × 12.205 × 3.228 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1120 kN, static C0 1730 kN, fatigue limit Pu 153 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 22500 g."
      },
      {
        "q": "Can a CARB bearing like C 3040 K locate the shaft axially?",
        "a": "No — that is the defining feature. C 3040 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3040",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×310×82 mm ISO 15 envelope and equivalent catalogue C/C0; C 3040 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23040",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×310×82 mm envelope as the SKF spherical roller bearing SKF 23040 CC/W33, but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23040-CCK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×310×82 mm envelope as the SKF spherical roller bearing SKF 23040 CCK/W33, but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3040-K",
      "C 3040 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C4040-V",
    "brand": "SKF",
    "manufacturer_designation": "C 4040 V",
    "series": "C4000-series",
    "type": "carb_toroidal",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1630,
    "static_load_kN": 2650,
    "fatigue_load_limit_kN": 236,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "weight_g": 30500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 4040 V belongs to the CARB family — compact aligning roller bearings: envelope 200×310×109 mm, radial rating 1630/2650 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (40) encode the 200 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 200 mm shaft deflects; no reference speed is listed and the limiting speed is 260 r/min. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 109 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 109 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 200 mm bore, shaft expansion is already measurable: calculate the required float inside the 109 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "The quoted 1630/2650 kN ratings belong to this exact execution (C 4040 V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4040 V must float; the two are designed to be used as a pair.",
      "Never use C 4040 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 1630/2650 kN ratings and 30500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 4040 V have?",
        "a": "A C 4040 V measures 200 mm bore × 310 mm outside diameter × 109 mm width (7.874 × 12.205 × 4.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1630 kN, static C0 2650 kN, fatigue limit Pu 236 kN, limiting speed 260 r/min, no reference speed listed, mass about 30500 g."
      },
      {
        "q": "What does C 4040 V mean in SKF part numbering?",
        "a": "C marks CARB; 40 the dimension series; the size code gives 200 mm bore; V is the execution (cylindrical bore for direct shaft fitting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 4040 V used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24040",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×310×109 mm envelope as the SKF spherical roller bearing SKF 24040 CC/W33, but catalogue C/C0 differ (1630/2650 kN vs 1353/2120 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "24040-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×310×109 mm envelope as the SKF spherical roller bearing SKF 24040 CCK30/W33, but catalogue C/C0 differ (1630/2650 kN vs 1353/2120 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C4040-V",
      "C 4040 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3140",
    "brand": "SKF",
    "manufacturer_designation": "C 3140",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1600,
    "static_load_kN": 2320,
    "fatigue_load_limit_kN": 200,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 41000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3140 is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 200 mm bore, 340 mm OD, 112 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (40) encode the 200 mm bore; suffixes describe bore and execution. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 200×340 mm size with 1600 kN dynamic and a 1,500 r/min reference speed. Selection arithmetic: C 1600 kN against C0 2320 kN gives a C0/C ratio of 1.45, and the 200 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 200 mm seat or heat it (max 120 °C) and seat it square; never press through the 112 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 200 mm bore, shaft expansion is already measurable: calculate the required float inside the 112 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "The quoted 1600/2320 kN ratings belong to this exact execution (C 3140); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Never use C 3140 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 200 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 1600/2320 kN ratings and 41000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3140 have?",
        "a": "A C 3140 measures 200 mm bore × 340 mm outside diameter × 112 mm width (7.874 × 13.386 × 4.409 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1600 kN, static C0 2320 kN, fatigue limit Pu 200 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 41000 g."
      },
      {
        "q": "What does C 3140 mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 200 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3140 used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3140-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×340×112 mm ISO 15 envelope and equivalent catalogue C/C0; C 3140 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23140",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (200×340×112 mm) SKF spherical roller bearing SKF 23140 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23140 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23140-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (200×340×112 mm) SKF spherical roller bearing SKF 23140 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23140 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3140",
      "C 3140"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3140-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3140 K",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1600,
    "static_load_kN": 2320,
    "fatigue_load_limit_kN": 200,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 41000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3140 K: the toroidal rollers allow the 200 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 3140 K the 31 dimension series fixes the 340 mm OD and 112 mm width around the 200 mm bore (code 40 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 200 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 112 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 112 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 200 mm bore, shaft expansion is already measurable: calculate the required float inside the 112 mm wide bearing rather than assuming the free-end clearance is \"enough\" at operating temperature.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3140 K must float; the two are designed to be used as a pair.",
      "The quoted 1600/2320 kN ratings belong to this exact execution (C 3140 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 3140 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 1600/2320 kN ratings and 41000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 3140 K mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 3140 K?",
        "a": "A C 3140 K measures 200 mm bore × 340 mm outside diameter × 112 mm width (7.874 × 13.386 × 4.409 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1600 kN, static C0 2320 kN, fatigue limit Pu 200 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 41000 g."
      },
      {
        "q": "Can a CARB bearing like C 3140 K locate the shaft axially?",
        "a": "No — that is the defining feature. C 3140 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3140 K designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 40 = 200 mm bore (code 40 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3140",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×340×112 mm ISO 15 envelope and equivalent catalogue C/C0; C 3140 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23140",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (200×340×112 mm) SKF spherical roller bearing SKF 23140 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23140 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23140-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (200×340×112 mm) SKF spherical roller bearing SKF 23140 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23140 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3140-K",
      "C 3140 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3044",
    "brand": "SKF",
    "manufacturer_designation": "C 3044",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 2040,
    "fatigue_load_limit_kN": 176,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 29500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3044 is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 220 mm bore, 340 mm OD, 90 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 3044 separates into C (CARB), 30 (dimension series), 44 (220 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 220×340×90 mm follows the ISO 15 plan. The cylindrical 220 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 220×340×90 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3044 deliberately carries none. Mounting: slide the bearing onto the 220 mm seat or heat it (max 120 °C) and seat it square; never press through the 90 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (29.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Never use C 3044 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 220 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 1,600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 1320/2040 kN ratings belong to this exact execution (C 3044); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 1320/2040 kN ratings and 29500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 3044?",
        "a": "A C 3044 measures 220 mm bore × 340 mm outside diameter × 90 mm width (8.661 × 13.386 × 3.543 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1320 kN, static C0 2040 kN, fatigue limit Pu 176 kN, reference speed 1,600 r/min, limiting speed 2,200 r/min, mass about 29500 g."
      },
      {
        "q": "Can a CARB bearing like C 3044 locate the shaft axially?",
        "a": "No — that is the defining feature. C 3044 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3044 designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 44 = 220 mm bore (code 44 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (1320 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3044 is the cylindrical bore for direct shaft fitting, pressed steel cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3044-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×340×90 mm ISO 15 envelope and equivalent catalogue C/C0; C 3044 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23044",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (220×340×90 mm) SKF spherical roller bearing SKF 23044 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23044 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23044-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (220×340×90 mm) SKF spherical roller bearing SKF 23044 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23044 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3044",
      "C 3044"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3044-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3044 K",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 2040,
    "fatigue_load_limit_kN": 176,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 29500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3044 K: the toroidal rollers allow the 220 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 3044 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 220 mm seat. Selection arithmetic: C 1320 kN against C0 2040 kN gives a C0/C ratio of 1.55, and the 176 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the normal-load position — the 340 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (29.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 220 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 1,600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3044 K must float; the two are designed to be used as a pair.",
      "Never use C 3044 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 1320/2040 kN ratings and 29500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3044 K have?",
        "a": "A C 3044 K measures 220 mm bore × 340 mm outside diameter × 90 mm width (8.661 × 13.386 × 3.543 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1320 kN, static C0 2040 kN, fatigue limit Pu 176 kN, reference speed 1,600 r/min, limiting speed 2,200 r/min, mass about 29500 g."
      },
      {
        "q": "What does C 3044 K mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 220 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3044 K used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3044",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×340×90 mm ISO 15 envelope and equivalent catalogue C/C0; C 3044 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23044",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (220×340×90 mm) SKF spherical roller bearing SKF 23044 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23044 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23044-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (220×340×90 mm) SKF spherical roller bearing SKF 23044 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23044 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3044-K",
      "C 3044 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C4044-V",
    "brand": "SKF",
    "manufacturer_designation": "C 4044 V",
    "series": "C4000-series",
    "type": "carb_toroidal",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1930,
    "static_load_kN": 3250,
    "fatigue_load_limit_kN": 280,
    "limiting_speed_rpm": 200,
    "max_rpm": 200,
    "weight_g": 40000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 4044 V is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 220 mm bore, 340 mm OD, 118 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 4044 V the 40 dimension series fixes the 340 mm OD and 118 mm width around the 220 mm bore (code 44 × 5); the suffix V then selects the cylindrical bore for direct shaft fitting, full-complement V execution (no cage). The V suffix denotes a full complement: the toroidal rollers fill the 118 mm space without a cage, raising C to 1930 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. The 40000 g mass over the 220×340×118 mm envelope yields about 8.77 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: slide the bearing onto the 220 mm seat or heat it (max 120 °C) and seat it square; never press through the 118 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (40 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4044 V must float; the two are designed to be used as a pair.",
      "Never use C 4044 V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 220 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 1930/3250 kN ratings and 40000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 4044 V?",
        "a": "A C 4044 V measures 220 mm bore × 340 mm outside diameter × 118 mm width (8.661 × 13.386 × 4.646 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1930 kN, static C0 3250 kN, fatigue limit Pu 280 kN, limiting speed 200 r/min, no reference speed listed, mass about 40000 g."
      },
      {
        "q": "Can a CARB bearing like C 4044 V locate the shaft axially?",
        "a": "No — that is the defining feature. C 4044 V deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 4044 V designation read?",
        "a": "C = CARB toroidal family; 40 = dimension series; 44 = 220 mm bore (code 44 × 5); suffix V selects cylindrical bore for direct shaft fitting, full-complement V execution (no cage). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (1930 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4044 V is the cylindrical bore for direct shaft fitting, full-complement V execution (no cage)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C4044-K30V",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×340×118 mm ISO 15 envelope and equivalent catalogue C/C0; C 4044 K30V is the 1:30 tapered-bore K30 full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "24044",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×340×118 mm envelope as the SKF spherical roller bearing SKF 24044 CC/W33, but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "24044-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×340×118 mm envelope as the SKF spherical roller bearing SKF 24044 CCK30/W33, but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C4044-V",
      "C 4044 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C4044-K30V",
    "brand": "SKF",
    "manufacturer_designation": "C 4044 K30V",
    "series": "C4000-series",
    "type": "carb_toroidal",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1930,
    "static_load_kN": 3250,
    "fatigue_load_limit_kN": 280,
    "limiting_speed_rpm": 200,
    "max_rpm": 200,
    "weight_g": 40000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 4044 K30V denotes a toroidal roller bearing whose 118 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 4044 is the full-complement cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K30V. The V suffix denotes a full complement: the toroidal rollers fill the 118 mm space without a cage, raising C to 1930 kN but cutting the speed ceiling (no reference speed is listed) versus the caged size. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 118 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (40 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 1930/3250 kN ratings belong to this exact execution (C 4044 K30V); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4044 K30V must float; the two are designed to be used as a pair.",
      "Never use C 4044 K30V as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 1930/3250 kN ratings and 40000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 4044 K30V have?",
        "a": "A C 4044 K30V measures 220 mm bore × 340 mm outside diameter × 118 mm width (8.661 × 13.386 × 4.646 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1930 kN, static C0 3250 kN, fatigue limit Pu 280 kN, limiting speed 200 r/min, no reference speed listed, mass about 40000 g."
      },
      {
        "q": "What does C 4044 K30V mean in SKF part numbering?",
        "a": "C marks CARB; 40 the dimension series; the size code gives 220 mm bore; K30V is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, full-complement V execution (no cage)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 4044 K30V used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 4044 K30V sealed?",
        "a": "No, it is an open execution relying on the housing seals; the full-complement V design has no thermal reference speed in the catalogue."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C4044-V",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×340×118 mm ISO 15 envelope and equivalent catalogue C/C0; C 4044 V is the cylindrical-bore full-complement V execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "24044",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×340×118 mm envelope as the SKF spherical roller bearing SKF 24044 CC/W33, but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "24044-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×340×118 mm envelope as the SKF spherical roller bearing SKF 24044 CCK30/W33, but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C4044-K30V",
      "C 4044 K30V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3144",
    "brand": "SKF",
    "manufacturer_designation": "C 3144",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1900,
    "static_load_kN": 2900,
    "fatigue_load_limit_kN": 245,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "weight_g": 52000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3144 denotes a toroidal roller bearing whose 120 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (44) encode the 220 mm bore; suffixes describe bore and execution. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 220×370 mm size with 1900 kN dynamic and a 1,400 r/min reference speed. Selection arithmetic: C 1900 kN against C0 2900 kN gives a C0/C ratio of 1.53, and the 245 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 220 mm seat or heat it (max 120 °C) and seat it square; never press through the 120 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (52 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3144 must float; the two are designed to be used as a pair.",
      "Never use C 3144 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 220 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 1,400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 1900/2900 kN ratings and 52000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 3144 have?",
        "a": "A C 3144 measures 220 mm bore × 370 mm outside diameter × 120 mm width (8.661 × 14.567 × 4.724 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1900 kN, static C0 2900 kN, fatigue limit Pu 245 kN, reference speed 1,400 r/min, limiting speed 1,800 r/min, mass about 52000 g."
      },
      {
        "q": "What does C 3144 mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 220 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3144 used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3144 sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3144-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×370×120 mm ISO 15 envelope and equivalent catalogue C/C0; C 3144 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23144",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (220×370×120 mm) SKF spherical roller bearing SKF 23144 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23144 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23144-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (220×370×120 mm) SKF spherical roller bearing SKF 23144 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23144 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3144",
      "C 3144"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3144-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3144 K",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1900,
    "static_load_kN": 2900,
    "fatigue_load_limit_kN": 245,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "weight_g": 52000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3144 K is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 220×370×120 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 3144 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 220 mm seat. Speed planning separates the 1,400 r/min thermal reference from the 1,800 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 120 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (52 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3144 K must float; the two are designed to be used as a pair.",
      "Never use C 3144 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 1900/2900 kN ratings belong to this exact execution (C 3144 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 1900/2900 kN ratings and 52000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3144 K have?",
        "a": "A C 3144 K measures 220 mm bore × 370 mm outside diameter × 120 mm width (8.661 × 14.567 × 4.724 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1900 kN, static C0 2900 kN, fatigue limit Pu 245 kN, reference speed 1,400 r/min, limiting speed 1,800 r/min, mass about 52000 g."
      },
      {
        "q": "What does C 3144 K mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 220 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3144 K used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3144",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×370×120 mm ISO 15 envelope and equivalent catalogue C/C0; C 3144 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23144",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (220×370×120 mm) SKF spherical roller bearing SKF 23144 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23144 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23144-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (220×370×120 mm) SKF spherical roller bearing SKF 23144 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23144 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3144-K",
      "C 3144 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C2244",
    "brand": "SKF",
    "manufacturer_designation": "C 2244",
    "series": "C2200-series",
    "type": "carb_toroidal",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2000,
    "static_load_kN": 2500,
    "fatigue_load_limit_kN": 208,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 57500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 2244 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 220×400×108 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 2244 the 22 dimension series fixes the 400 mm OD and 108 mm width around the 220 mm bore (code 44 × 5); the suffix the bare number then selects the cylindrical bore for direct shaft fitting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 220 mm seat. Speed planning separates the 1,500 r/min thermal reference from the 2,000 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 400 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (57.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 1,500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 2000/2500 kN ratings belong to this exact execution (C 2244); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Never use C 2244 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 2000/2500 kN ratings and 57500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 2244?",
        "a": "A C 2244 measures 220 mm bore × 400 mm outside diameter × 108 mm width (8.661 × 15.748 × 4.252 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2000 kN, static C0 2500 kN, fatigue limit Pu 208 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 57500 g."
      },
      {
        "q": "Can a CARB bearing like C 2244 locate the shaft axially?",
        "a": "No — that is the defining feature. C 2244 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 2244 designation read?",
        "a": "C = CARB toroidal family; 22 = dimension series; 44 = 220 mm bore (code 44 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (2000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 2244 is the cylindrical bore for direct shaft fitting, pressed steel cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C2244-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×400×108 mm ISO 15 envelope and equivalent catalogue C/C0; C 2244 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C2244",
      "C 2244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C2244-K",
    "brand": "SKF",
    "manufacturer_designation": "C 2244 K",
    "series": "C2200-series",
    "type": "carb_toroidal",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2000,
    "static_load_kN": 2500,
    "fatigue_load_limit_kN": 208,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 57500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 2244 K: the toroidal rollers allow the 220 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 2244 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. The K suffix gives a 1:12 tapered 220 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 220×400×108 mm are identical — only the mounting method changes. Speed planning separates the 1,500 r/min thermal reference from the 2,000 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 108 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (57.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 220 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 1,500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 2244 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 2000/2500 kN ratings belong to this exact execution (C 2244 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 2000/2500 kN ratings and 57500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Is the C 2244 K sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 2244 K have?",
        "a": "A C 2244 K measures 220 mm bore × 400 mm outside diameter × 108 mm width (8.661 × 15.748 × 4.252 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2000 kN, static C0 2500 kN, fatigue limit Pu 208 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 57500 g."
      },
      {
        "q": "What does C 2244 K mean in SKF part numbering?",
        "a": "C marks CARB; 22 the dimension series; the size code gives 220 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C2244",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×400×108 mm ISO 15 envelope and equivalent catalogue C/C0; C 2244 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C2244-K",
      "C 2244 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3048",
    "brand": "SKF",
    "manufacturer_designation": "C 3048",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1340,
    "static_load_kN": 2160,
    "fatigue_load_limit_kN": 183,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 32000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3048 denotes a toroidal roller bearing whose 92 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 3048 separates into C (CARB), 30 (dimension series), 48 (240 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 240×360×92 mm follows the ISO 15 plan. The cylindrical 240 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 240×360×92 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3048 deliberately carries none. Mounting: slide the bearing onto the 240 mm seat or heat it (max 120 °C) and seat it square; never press through the 92 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (32 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 1,500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 1340/2160 kN ratings belong to this exact execution (C 3048); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3048 must float; the two are designed to be used as a pair.",
      "Never use C 3048 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 1340/2160 kN ratings and 32000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 3048 locate the shaft axially?",
        "a": "No — that is the defining feature. C 3048 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3048 designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 48 = 240 mm bore (code 48 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (1340 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3048 is the cylindrical bore for direct shaft fitting, pressed steel cage."
      },
      {
        "q": "How is C 3048 mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 240 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 92 mm roller set."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3048-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 240×360×92 mm ISO 15 envelope and equivalent catalogue C/C0; C 3048 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23048",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (240×360×92 mm) SKF spherical roller bearing SKF 23048 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23048 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23048-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (240×360×92 mm) SKF spherical roller bearing SKF 23048 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23048 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3048",
      "C 3048"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3048-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3048 K",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1340,
    "static_load_kN": 2160,
    "fatigue_load_limit_kN": 183,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 32000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 3048 K combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 240 mm bore, 360 mm outside diameter, 92 mm wide unit rated 1340 kN dynamic. The designation C 3048 K separates into C (CARB), 30 (dimension series), 48 (240 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 240×360×92 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 240 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 240×360×92 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 92 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 92 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (32 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 1,500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 1340/2160 kN ratings belong to this exact execution (C 3048 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3048 K must float; the two are designed to be used as a pair.",
      "Never use C 3048 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 1340/2160 kN ratings and 32000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 3048 K mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 3048 K?",
        "a": "A C 3048 K measures 240 mm bore × 360 mm outside diameter × 92 mm width (9.449 × 14.173 × 3.622 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1340 kN, static C0 2160 kN, fatigue limit Pu 183 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 32000 g."
      },
      {
        "q": "Can a CARB bearing like C 3048 K locate the shaft axially?",
        "a": "No — that is the defining feature. C 3048 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3048 K designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 48 = 240 mm bore (code 48 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3048",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 240×360×92 mm ISO 15 envelope and equivalent catalogue C/C0; C 3048 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23048",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (240×360×92 mm) SKF spherical roller bearing SKF 23048 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23048 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23048-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (240×360×92 mm) SKF spherical roller bearing SKF 23048 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23048 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3048-K",
      "C 3048 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3148",
    "brand": "SKF",
    "manufacturer_designation": "C 3148",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2320,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 285,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 64000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3148 is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 240×400×128 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (48) encode the 240 mm bore; suffixes describe bore and execution. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 240×400 mm size with 2320 kN dynamic and a 1,300 r/min reference speed. Selection arithmetic: C 2320 kN against C0 3450 kN gives a C0/C ratio of 1.49, and the 285 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 240 mm seat or heat it (max 120 °C) and seat it square; never press through the 128 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (64 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 240 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 1,300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3148 must float; the two are designed to be used as a pair.",
      "Never use C 3148 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 2320/3450 kN ratings and 64000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 3148 mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 240 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3148 used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3148 sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3148-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 240×400×128 mm ISO 15 envelope and equivalent catalogue C/C0; C 3148 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23148",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (240×400×128 mm) SKF spherical roller bearing SKF 23148 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23148 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23148-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (240×400×128 mm) SKF spherical roller bearing SKF 23148 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23148 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3148",
      "C 3148"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3148-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3148 K",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2320,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 285,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 64000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3148 K belongs to the CARB family — compact aligning roller bearings: envelope 240×400×128 mm, radial rating 2320/3450 kN C/C0, and no axial-locating function by design. The designation C 3148 K separates into C (CARB), 31 (dimension series), 48 (240 mm bore) and K (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage); envelope 240×400×128 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 240 mm seat. Selection arithmetic: C 2320 kN against C0 3450 kN gives a C0/C ratio of 1.49, and the 285 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 128 mm wide cavity does not fill itself.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (64 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Never use C 3148 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 240 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3148 K must float; the two are designed to be used as a pair.",
      "The 2320/3450 kN ratings and 64000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 3148 K?",
        "a": "A C 3148 K measures 240 mm bore × 400 mm outside diameter × 128 mm width (9.449 × 15.748 × 5.039 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2320 kN, static C0 3450 kN, fatigue limit Pu 285 kN, reference speed 1,300 r/min, limiting speed 1,700 r/min, mass about 64000 g."
      },
      {
        "q": "Can a CARB bearing like C 3148 K locate the shaft axially?",
        "a": "No — that is the defining feature. C 3148 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3148 K designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 48 = 240 mm bore (code 48 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (2320 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3148 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3148",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 240×400×128 mm ISO 15 envelope and equivalent catalogue C/C0; C 3148 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23148",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (240×400×128 mm) SKF spherical roller bearing SKF 23148 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23148 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23148-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (240×400×128 mm) SKF spherical roller bearing SKF 23148 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23148 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3148-K",
      "C 3148 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3052",
    "brand": "SKF",
    "manufacturer_designation": "C 3052",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1760,
    "static_load_kN": 2850,
    "fatigue_load_limit_kN": 232,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "weight_g": 47000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 3052 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 260 mm bore, 400 mm outside diameter, 104 mm wide unit rated 1760 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 3052 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here the bare number. The cylindrical 260 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 260×400×104 mm are identical — only the mounting method changes. The 47000 g mass over the 260×400×104 mm envelope yields about 6.77 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 104 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (47 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 1760/2850 kN ratings belong to this exact execution (C 3052); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3052 must float; the two are designed to be used as a pair.",
      "Never use C 3052 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 1760/2850 kN ratings and 47000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3052 have?",
        "a": "A C 3052 measures 260 mm bore × 400 mm outside diameter × 104 mm width (10.236 × 15.748 × 4.094 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1760 kN, static C0 2850 kN, fatigue limit Pu 232 kN, reference speed 1,300 r/min, limiting speed 1,800 r/min, mass about 47000 g."
      },
      {
        "q": "What does C 3052 mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 260 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3052 used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3052-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 260×400×104 mm ISO 15 envelope and equivalent catalogue C/C0; C 3052 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23052",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×400×104 mm envelope as the SKF spherical roller bearing SKF 23052 CC/W33, but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23052-CCK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×400×104 mm envelope as the SKF spherical roller bearing SKF 23052 CCK/W33, but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3052",
      "C 3052"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3052-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3052 K",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1760,
    "static_load_kN": 2850,
    "fatigue_load_limit_kN": 232,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "weight_g": 47000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3052 K belongs to the CARB family — compact aligning roller bearings: envelope 260×400×104 mm, radial rating 1760/2850 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (52) encode the 260 mm bore; suffixes describe bore and execution. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 260×400 mm size with 1760 kN dynamic and a 1,300 r/min reference speed. The 47000 g mass over the 260×400×104 mm envelope yields about 6.77 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 104 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (47 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3052 K must float; the two are designed to be used as a pair.",
      "Never use C 3052 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Reference and limiting speeds are different limits: the 1,300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 1760/2850 kN ratings belong to this exact execution (C 3052 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 1760/2850 kN ratings and 47000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Is the C 3052 K sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3052 K have?",
        "a": "A C 3052 K measures 260 mm bore × 400 mm outside diameter × 104 mm width (10.236 × 15.748 × 4.094 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1760 kN, static C0 2850 kN, fatigue limit Pu 232 kN, reference speed 1,300 r/min, limiting speed 1,800 r/min, mass about 47000 g."
      },
      {
        "q": "What does C 3052 K mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 260 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3052",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 260×400×104 mm ISO 15 envelope and equivalent catalogue C/C0; C 3052 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23052",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×400×104 mm envelope as the SKF spherical roller bearing SKF 23052 CC/W33, but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23052-CCK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×400×104 mm envelope as the SKF spherical roller bearing SKF 23052 CCK/W33, but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3052-K",
      "C 3052 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3152",
    "brand": "SKF",
    "manufacturer_designation": "C 3152",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2650,
    "static_load_kN": 4050,
    "fatigue_load_limit_kN": 325,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "weight_g": 88000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3152 is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 260 mm bore, 440 mm OD, 144 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 3152 separates into C (CARB), 31 (dimension series), 52 (260 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 260×440×144 mm follows the ISO 15 plan. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 260×440 mm size with 2650 kN dynamic and a 1,100 r/min reference speed. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 144 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 144 mm wide cavity does not fill itself.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (88 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 1,100 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 2650/4050 kN ratings belong to this exact execution (C 3152); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3152 must float; the two are designed to be used as a pair.",
      "The 2650/4050 kN ratings and 88000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 3152 mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 260 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 144 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 3152?",
        "a": "A C 3152 measures 260 mm bore × 440 mm outside diameter × 144 mm width (10.236 × 17.323 × 5.669 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2650 kN, static C0 4050 kN, fatigue limit Pu 325 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 88000 g."
      },
      {
        "q": "Can a CARB bearing like C 3152 locate the shaft axially?",
        "a": "No — that is the defining feature. C 3152 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3152 designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 52 = 260 mm bore (code 52 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3152-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 260×440×144 mm ISO 15 envelope and equivalent catalogue C/C0; C 3152 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23152",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (260×440×144 mm) SKF spherical roller bearing SKF 23152 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23152 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23152-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (260×440×144 mm) SKF spherical roller bearing SKF 23152 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23152 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3152",
      "C 3152"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3152-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3152 K",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2650,
    "static_load_kN": 4050,
    "fatigue_load_limit_kN": 325,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "weight_g": 88000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3152 K belongs to the CARB family — compact aligning roller bearings: envelope 260×440×144 mm, radial rating 2650/4050 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (52) encode the 260 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 260 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3152 K deliberately carries none. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 144 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (88 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 2650/4050 kN ratings belong to this exact execution (C 3152 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 260 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 1,100 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 2650/4050 kN ratings and 88000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3152 K have?",
        "a": "A C 3152 K measures 260 mm bore × 440 mm outside diameter × 144 mm width (10.236 × 17.323 × 5.669 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2650 kN, static C0 4050 kN, fatigue limit Pu 325 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 88000 g."
      },
      {
        "q": "What does C 3152 K mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 260 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3152 K used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3152",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 260×440×144 mm ISO 15 envelope and equivalent catalogue C/C0; C 3152 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23152",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (260×440×144 mm) SKF spherical roller bearing SKF 23152 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23152 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23152-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (260×440×144 mm) SKF spherical roller bearing SKF 23152 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23152 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3152-K",
      "C 3152 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3056",
    "brand": "SKF",
    "manufacturer_designation": "C 3056",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1860,
    "static_load_kN": 3100,
    "fatigue_load_limit_kN": 250,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "weight_g": 50500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3056 is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 280 mm bore, 420 mm OD, 106 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 3056 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here the bare number. The cylindrical 280 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 280×420×106 mm are identical — only the mounting method changes. The 50500 g mass over the 280×420×106 mm envelope yields about 6.64 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 106 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (50.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3056 must float; the two are designed to be used as a pair.",
      "Never use C 3056 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Reference and limiting speeds are different limits: the 1,200 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 1860/3100 kN ratings belong to this exact execution (C 3056); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 1860/3100 kN ratings and 50500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 3056 have?",
        "a": "A C 3056 measures 280 mm bore × 420 mm outside diameter × 106 mm width (11.024 × 16.535 × 4.173 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1860 kN, static C0 3100 kN, fatigue limit Pu 250 kN, reference speed 1,200 r/min, limiting speed 1,600 r/min, mass about 50500 g."
      },
      {
        "q": "What does C 3056 mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 280 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3056 used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3056 sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3056-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 280×420×106 mm ISO 15 envelope and equivalent catalogue C/C0; C 3056 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23056",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (280×420×106 mm) SKF spherical roller bearing SKF 23056 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23056 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23056-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (280×420×106 mm) SKF spherical roller bearing SKF 23056 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23056 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3056",
      "C 3056"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3056-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3056 K",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1860,
    "static_load_kN": 3100,
    "fatigue_load_limit_kN": 250,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "weight_g": 50500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3056 K is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 280 mm bore, 420 mm OD, 106 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 3056 K the 30 dimension series fixes the 420 mm OD and 106 mm width around the 280 mm bore (code 56 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. The K suffix gives a 1:12 tapered 280 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 280×420×106 mm are identical — only the mounting method changes. Speed planning separates the 1,200 r/min thermal reference from the 1,600 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 106 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (50.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Never use C 3056 K as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 280 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The quoted 1860/3100 kN ratings belong to this exact execution (C 3056 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 1860/3100 kN ratings and 50500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 3056 K mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 3056 K?",
        "a": "A C 3056 K measures 280 mm bore × 420 mm outside diameter × 106 mm width (11.024 × 16.535 × 4.173 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1860 kN, static C0 3100 kN, fatigue limit Pu 250 kN, reference speed 1,200 r/min, limiting speed 1,600 r/min, mass about 50500 g."
      },
      {
        "q": "Can a CARB bearing like C 3056 K locate the shaft axially?",
        "a": "No — that is the defining feature. C 3056 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3056 K designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 56 = 280 mm bore (code 56 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3056",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 280×420×106 mm ISO 15 envelope and equivalent catalogue C/C0; C 3056 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23056",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (280×420×106 mm) SKF spherical roller bearing SKF 23056 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23056 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23056-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (280×420×106 mm) SKF spherical roller bearing SKF 23056 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23056 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3056-K",
      "C 3056 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3156",
    "brand": "SKF",
    "manufacturer_designation": "C 3156",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 146,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2850,
    "static_load_kN": 4500,
    "fatigue_load_limit_kN": 355,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 94500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3156 denotes a toroidal roller bearing whose 146 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 3156 separates into C (CARB), 31 (dimension series), 56 (280 mm bore) and the bare number (cylindrical bore for direct shaft fitting, pressed steel cage); envelope 280×460×146 mm follows the ISO 15 plan. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 280×460 mm size with 2850 kN dynamic and a 1,100 r/min reference speed. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 146 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 146 mm wide cavity does not fill itself.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (94.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3156 must float; the two are designed to be used as a pair.",
      "Reference and limiting speeds are different limits: the 1,100 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 2850/4500 kN ratings belong to this exact execution (C 3156); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 2850/4500 kN ratings and 94500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 3156?",
        "a": "A C 3156 measures 280 mm bore × 460 mm outside diameter × 146 mm width (11.024 × 18.11 × 5.748 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2850 kN, static C0 4500 kN, fatigue limit Pu 355 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 94500 g."
      },
      {
        "q": "Can a CARB bearing like C 3156 locate the shaft axially?",
        "a": "No — that is the defining feature. C 3156 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3156 designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 56 = 280 mm bore (code 56 × 5); suffix the bare number selects cylindrical bore for direct shaft fitting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (2850 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3156 is the cylindrical bore for direct shaft fitting, pressed steel cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3156-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 280×460×146 mm ISO 15 envelope and equivalent catalogue C/C0; C 3156 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23156",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (280×460×146 mm) SKF spherical roller bearing SKF 23156 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23156 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23156-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (280×460×146 mm) SKF spherical roller bearing SKF 23156 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23156 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3156",
      "C 3156"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3156-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3156 K",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 146,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2850,
    "static_load_kN": 4500,
    "fatigue_load_limit_kN": 355,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 94500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists C 3156 K in the dimension series 31 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. In C 3156 K the 31 dimension series fixes the 460 mm OD and 146 mm width around the 280 mm bore (code 56 × 5); the suffix K then selects the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 280 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 146 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 146 mm wide cavity does not fill itself.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (94.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3156 K must float; the two are designed to be used as a pair.",
      "Reference and limiting speeds are different limits: the 1,100 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 2850/4500 kN ratings belong to this exact execution (C 3156 K); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 2850/4500 kN ratings and 94500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 3156 K?",
        "a": "A C 3156 K measures 280 mm bore × 460 mm outside diameter × 146 mm width (11.024 × 18.11 × 5.748 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2850 kN, static C0 4500 kN, fatigue limit Pu 355 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 94500 g."
      },
      {
        "q": "Can a CARB bearing like C 3156 K locate the shaft axially?",
        "a": "No — that is the defining feature. C 3156 K deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3156 K designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 56 = 280 mm bore (code 56 × 5); suffix K selects tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (2850 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3156 K is the tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3156",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 280×460×146 mm ISO 15 envelope and equivalent catalogue C/C0; C 3156 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23156",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (280×460×146 mm) SKF spherical roller bearing SKF 23156 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23156 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23156-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (280×460×146 mm) SKF spherical roller bearing SKF 23156 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23156 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3156-K",
      "C 3156 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3060-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3060 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2160,
    "static_load_kN": 3750,
    "fatigue_load_limit_kN": 290,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "weight_g": 72000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3060 M denotes a toroidal roller bearing whose 118 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (60) encode the 300 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 300 mm shaft deflects; the 1,100 r/min reference and 1,500 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3060 M deliberately carries none. Mounting: slide the bearing onto the 300 mm seat or heat it (max 120 °C) and seat it square; never press through the 118 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (72 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 300 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 1,100 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 3060 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 2160/3750 kN ratings belong to this exact execution (C 3060 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 2160/3750 kN ratings and 72000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 3060 M have?",
        "a": "A C 3060 M measures 300 mm bore × 460 mm outside diameter × 118 mm width (11.811 × 18.11 × 4.646 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2160 kN, static C0 3750 kN, fatigue limit Pu 290 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 72000 g."
      },
      {
        "q": "What does C 3060 M mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 300 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3060 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3060 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3060-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 300×460×118 mm ISO 15 envelope and equivalent catalogue C/C0; C 3060 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23060",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (300×460×118 mm) SKF spherical roller bearing SKF 23060 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23060 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23060-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (300×460×118 mm) SKF spherical roller bearing SKF 23060 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23060 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3060-M",
      "C 3060 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3060-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3060 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2160,
    "static_load_kN": 3750,
    "fatigue_load_limit_kN": 290,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "weight_g": 72000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3060 KM: the toroidal rollers allow the 300 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. The designation C 3060 KM separates into C (CARB), 30 (dimension series), 60 (300 mm bore) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 300×460×118 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 300 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 300×460×118 mm are identical — only the mounting method changes. Speed planning separates the 1,100 r/min thermal reference from the 1,500 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 118 mm wide cavity does not fill itself.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (72 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 1,100 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 2160/3750 kN ratings belong to this exact execution (C 3060 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 3060 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 300 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 2160/3750 kN ratings and 72000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 3060 KM mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 3060 KM?",
        "a": "A C 3060 KM measures 300 mm bore × 460 mm outside diameter × 118 mm width (11.811 × 18.11 × 4.646 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2160 kN, static C0 3750 kN, fatigue limit Pu 290 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 72000 g."
      },
      {
        "q": "Can a CARB bearing like C 3060 KM locate the shaft axially?",
        "a": "No — that is the defining feature. C 3060 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3060 KM designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 60 = 300 mm bore (code 60 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3060-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 300×460×118 mm ISO 15 envelope and equivalent catalogue C/C0; C 3060 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23060",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (300×460×118 mm) SKF spherical roller bearing SKF 23060 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23060 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23060-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (300×460×118 mm) SKF spherical roller bearing SKF 23060 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23060 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3060-KM",
      "C 3060 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C4060-M",
    "brand": "SKF",
    "manufacturer_designation": "C 4060 M",
    "series": "C4000-series",
    "type": "carb_toroidal",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2900,
    "static_load_kN": 4900,
    "fatigue_load_limit_kN": 390,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 95500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 4060 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 300×460×160 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (60) encode the 300 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 300 mm seat. The 95500 g mass over the 300×460×160 mm envelope yields about 9.67 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: slide the bearing onto the 300 mm seat or heat it (max 120 °C) and seat it square; never press through the 160 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (95.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 2900/4900 kN ratings belong to this exact execution (C 4060 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Never use C 4060 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 300 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 2900/4900 kN ratings and 95500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Is the C 4060 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 4060 M have?",
        "a": "A C 4060 M measures 300 mm bore × 460 mm outside diameter × 160 mm width (11.811 × 18.11 × 6.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2900 kN, static C0 4900 kN, fatigue limit Pu 390 kN, reference speed 900 r/min, limiting speed 1,200 r/min, mass about 95500 g."
      },
      {
        "q": "What does C 4060 M mean in SKF part numbering?",
        "a": "C marks CARB; 40 the dimension series; the size code gives 300 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C4060-K30M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 300×460×160 mm ISO 15 envelope and equivalent catalogue C/C0; C 4060 K30M is the 1:30 tapered-bore K30 M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "24060",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (300×460×160 mm) SKF spherical roller bearing SKF 24060 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24060 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "24060-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (300×460×160 mm) SKF spherical roller bearing SKF 24060 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24060 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C4060-M",
      "C 4060 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C4060-K30M",
    "brand": "SKF",
    "manufacturer_designation": "C 4060 K30M",
    "series": "C4000-series",
    "type": "carb_toroidal",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2900,
    "static_load_kN": 4900,
    "fatigue_load_limit_kN": 390,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 95500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 4060 K30M is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 300 mm bore, 460 mm OD, 160 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 4060 K30M the 40 dimension series fixes the 460 mm OD and 160 mm width around the 300 mm bore (code 60 × 5); the suffix K30M then selects the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 300 mm shaft deflects; the 900 r/min reference and 1,200 r/min limiting speed are both catalogue values. Selection arithmetic: C 2900 kN against C0 4900 kN gives a C0/C ratio of 1.69, and the 390 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (95.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Never use C 4060 K30M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 300 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4060 K30M must float; the two are designed to be used as a pair.",
      "The 2900/4900 kN ratings and 95500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 4060 K30M?",
        "a": "A C 4060 K30M measures 300 mm bore × 460 mm outside diameter × 160 mm width (11.811 × 18.11 × 6.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2900 kN, static C0 4900 kN, fatigue limit Pu 390 kN, reference speed 900 r/min, limiting speed 1,200 r/min, mass about 95500 g."
      },
      {
        "q": "Can a CARB bearing like C 4060 K30M locate the shaft axially?",
        "a": "No — that is the defining feature. C 4060 K30M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 4060 K30M designation read?",
        "a": "C = CARB toroidal family; 40 = dimension series; 60 = 300 mm bore (code 60 × 5); suffix K30M selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (2900 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 4060 K30M is the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C4060-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 300×460×160 mm ISO 15 envelope and equivalent catalogue C/C0; C 4060 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "24060",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (300×460×160 mm) SKF spherical roller bearing SKF 24060 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 24060 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "24060-CCK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (300×460×160 mm) SKF spherical roller bearing SKF 24060 CCK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24060 CCK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C4060-K30M",
      "C 4060 K30M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3160",
    "brand": "SKF",
    "manufacturer_designation": "C 3160",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3250,
    "static_load_kN": 5200,
    "fatigue_load_limit_kN": 400,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 125000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 3160 combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 300 mm bore, 500 mm outside diameter, 160 mm wide unit rated 3250 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 3160 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here the bare number. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 300×500 mm size with 3250 kN dynamic and a 950 r/min reference speed. Speed planning separates the 950 r/min thermal reference from the 1,300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 500 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (125 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3160 must float; the two are designed to be used as a pair.",
      "Never use C 3160 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 300 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 950 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 3250/5200 kN ratings and 125000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Is the C 3160 sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3160 have?",
        "a": "A C 3160 measures 300 mm bore × 500 mm outside diameter × 160 mm width (11.811 × 19.685 × 6.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3250 kN, static C0 5200 kN, fatigue limit Pu 400 kN, reference speed 950 r/min, limiting speed 1,300 r/min, mass about 125000 g."
      },
      {
        "q": "What does C 3160 mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 300 mm bore; the bare number is the execution (cylindrical bore for direct shaft fitting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3160-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 300×500×160 mm ISO 15 envelope and equivalent catalogue C/C0; C 3160 K is the 1:12 tapered-bore K steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23160",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (300×500×160 mm) SKF spherical roller bearing SKF 23160 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23160 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23160-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (300×500×160 mm) SKF spherical roller bearing SKF 23160 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23160 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3160",
      "C 3160"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3160-K",
    "brand": "SKF",
    "manufacturer_designation": "C 3160 K",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3250,
    "static_load_kN": 5200,
    "fatigue_load_limit_kN": 400,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 125000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3160 K denotes a toroidal roller bearing whose 160 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 3160 is the steel-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K. The unsuffixed execution carries a pressed steel window cage — the balanced standard for the 300×500 mm size with 3250 kN dynamic and a 950 r/min reference speed. Speed planning separates the 950 r/min thermal reference from the 1,300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the steel-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (125 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 300 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 950 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3160 K must float; the two are designed to be used as a pair.",
      "The 3250/5200 kN ratings and 125000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Is the C 3160 K sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3160 K have?",
        "a": "A C 3160 K measures 300 mm bore × 500 mm outside diameter × 160 mm width (11.811 × 19.685 × 6.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3250 kN, static C0 5200 kN, fatigue limit Pu 400 kN, reference speed 950 r/min, limiting speed 1,300 r/min, mass about 125000 g."
      },
      {
        "q": "What does C 3160 K mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 300 mm bore; K is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, pressed steel cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3160",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 300×500×160 mm ISO 15 envelope and equivalent catalogue C/C0; C 3160 is the cylindrical-bore steel-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23160",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (300×500×160 mm) SKF spherical roller bearing SKF 23160 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23160 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23160-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (300×500×160 mm) SKF spherical roller bearing SKF 23160 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23160 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3160-K",
      "C 3160 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3064-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3064 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2280,
    "static_load_kN": 4000,
    "fatigue_load_limit_kN": 305,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 78000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3064 M: the toroidal rollers allow the 320 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 3064 M the 30 dimension series fixes the 480 mm OD and 121 mm width around the 320 mm bore (code 64 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 320 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 121 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (78 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 1,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 2280/4000 kN ratings belong to this exact execution (C 3064 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 3064 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 320 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 2280/4000 kN ratings and 78000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 3064 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 3064 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3064 M designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 64 = 320 mm bore (code 64 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (2280 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3064 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      },
      {
        "q": "How is C 3064 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 320 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 121 mm roller set."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3064-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 320×480×121 mm ISO 15 envelope and equivalent catalogue C/C0; C 3064 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23064",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (320×480×121 mm) SKF spherical roller bearing SKF 23064 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23064 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23064-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (320×480×121 mm) SKF spherical roller bearing SKF 23064 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23064 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3064-M",
      "C 3064 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3064-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3064 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2280,
    "static_load_kN": 4000,
    "fatigue_load_limit_kN": 305,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 78000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3064 KM denotes a toroidal roller bearing whose 121 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 3064 KM the 30 dimension series fixes the 480 mm OD and 121 mm width around the 320 mm bore (code 64 × 5); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 320 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3064 KM deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (78 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 1,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 2280/4000 kN ratings belong to this exact execution (C 3064 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3064 KM must float; the two are designed to be used as a pair.",
      "The 2280/4000 kN ratings and 78000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 3064 KM mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 3064 KM?",
        "a": "A C 3064 KM measures 320 mm bore × 480 mm outside diameter × 121 mm width (12.598 × 18.898 × 4.764 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2280 kN, static C0 4000 kN, fatigue limit Pu 305 kN, reference speed 1,000 r/min, limiting speed 1,400 r/min, mass about 78000 g."
      },
      {
        "q": "Can a CARB bearing like C 3064 KM locate the shaft axially?",
        "a": "No — that is the defining feature. C 3064 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3064 KM designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 64 = 320 mm bore (code 64 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3064-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 320×480×121 mm ISO 15 envelope and equivalent catalogue C/C0; C 3064 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23064",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (320×480×121 mm) SKF spherical roller bearing SKF 23064 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23064 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23064-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (320×480×121 mm) SKF spherical roller bearing SKF 23064 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23064 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3064-KM",
      "C 3064 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3164-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3164 M",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4150,
    "static_load_kN": 6300,
    "fatigue_load_limit_kN": 480,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 164000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3164 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 320×540×176 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 3164 M the 31 dimension series fixes the 540 mm OD and 176 mm width around the 320 mm bore (code 64 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The cylindrical 320 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 320×540×176 mm are identical — only the mounting method changes. Selection arithmetic: C 4150 kN against C0 6300 kN gives a C0/C ratio of 1.52, and the 480 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: slide the bearing onto the 320 mm seat or heat it (max 120 °C) and seat it square; never press through the 176 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (164 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Never use C 3164 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 320 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 900 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 4150/6300 kN ratings belong to this exact execution (C 3164 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 4150/6300 kN ratings and 164000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the C 3164 M designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 64 = 320 mm bore (code 64 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (4150 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3164 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      },
      {
        "q": "How is C 3164 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 320 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 176 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 3164 M?",
        "a": "A C 3164 M measures 320 mm bore × 540 mm outside diameter × 176 mm width (12.598 × 21.26 × 6.929 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4150 kN, static C0 6300 kN, fatigue limit Pu 480 kN, reference speed 900 r/min, limiting speed 1,300 r/min, mass about 164000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3164-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 320×540×176 mm ISO 15 envelope and equivalent catalogue C/C0; C 3164 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23164",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (320×540×176 mm) SKF spherical roller bearing SKF 23164 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23164 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23164-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (320×540×176 mm) SKF spherical roller bearing SKF 23164 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23164 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3164-M",
      "C 3164 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3164-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3164 KM",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4150,
    "static_load_kN": 6300,
    "fatigue_load_limit_kN": 480,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 164000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3164 KM is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 320×540×176 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 3164 KM the 31 dimension series fixes the 540 mm OD and 176 mm width around the 320 mm bore (code 64 × 5); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The KM suffix is a one-piece machined brass cage centred on the rollers, supplied for the 320 mm and larger sizes needing robust guidance under heavy load. Speed planning separates the 900 r/min thermal reference from the 1,300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 176 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (164 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3164 KM must float; the two are designed to be used as a pair.",
      "Never use C 3164 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 320 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 4150/6300 kN ratings and 164000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 3164 KM locate the shaft axially?",
        "a": "No — that is the defining feature. C 3164 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3164 KM designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 64 = 320 mm bore (code 64 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (4150 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3164 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage."
      },
      {
        "q": "How is C 3164 KM mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3164-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 320×540×176 mm ISO 15 envelope and equivalent catalogue C/C0; C 3164 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23164",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (320×540×176 mm) SKF spherical roller bearing SKF 23164 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23164 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23164-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (320×540×176 mm) SKF spherical roller bearing SKF 23164 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23164 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3164-KM",
      "C 3164 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3068-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3068 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 133,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2900,
    "static_load_kN": 5000,
    "fatigue_load_limit_kN": 375,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 100000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 3068 M combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 340 mm bore, 520 mm outside diameter, 133 mm wide unit rated 2900 kN dynamic. The designation C 3068 M separates into C (CARB), 30 (dimension series), 68 (340 mm bore) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 340×520×133 mm follows the ISO 15 plan. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 340 mm and larger sizes needing robust guidance under heavy load. Speed planning separates the 950 r/min thermal reference from the 1,300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 340 mm seat or heat it (max 120 °C) and seat it square; never press through the 133 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (100 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 950 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 2900/5000 kN ratings belong to this exact execution (C 3068 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Never use C 3068 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 2900/5000 kN ratings and 100000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the C 3068 M designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 68 = 340 mm bore (code 68 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (2900 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3068 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      },
      {
        "q": "How is C 3068 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 340 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 133 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 3068 M?",
        "a": "A C 3068 M measures 340 mm bore × 520 mm outside diameter × 133 mm width (13.386 × 20.472 × 5.236 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2900 kN, static C0 5000 kN, fatigue limit Pu 375 kN, reference speed 950 r/min, limiting speed 1,300 r/min, mass about 100000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3068-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 340×520×133 mm ISO 15 envelope and equivalent catalogue C/C0; C 3068 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3068-M",
      "C 3068 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3068-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3068 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 133,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2900,
    "static_load_kN": 5000,
    "fatigue_load_limit_kN": 375,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 100000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3068 KM is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 340 mm bore, 520 mm OD, 133 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (68) encode the 340 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 340 mm shaft deflects; the 950 r/min reference and 1,300 r/min limiting speed are both catalogue values. Selection arithmetic: C 2900 kN against C0 5000 kN gives a C0/C ratio of 1.72, and the 375 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 133 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (100 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 340 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 950 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 3068 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 2900/5000 kN ratings belong to this exact execution (C 3068 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 2900/5000 kN ratings and 100000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Is the C 3068 KM sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3068 KM have?",
        "a": "A C 3068 KM measures 340 mm bore × 520 mm outside diameter × 133 mm width (13.386 × 20.472 × 5.236 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2900 kN, static C0 5000 kN, fatigue limit Pu 375 kN, reference speed 950 r/min, limiting speed 1,300 r/min, mass about 100000 g."
      },
      {
        "q": "What does C 3068 KM mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 340 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3068-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 340×520×133 mm ISO 15 envelope and equivalent catalogue C/C0; C 3068 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3068-KM",
      "C 3068 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3168-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3168 M",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 190,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4900,
    "static_load_kN": 7500,
    "fatigue_load_limit_kN": 560,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 205000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3168 M belongs to the CARB family — compact aligning roller bearings: envelope 340×580×190 mm, radial rating 4900/7500 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 3168 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. The cylindrical 340 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 340×580×190 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3168 M deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 190 mm wide cavity does not fill itself.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (205 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 340 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 850 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 4900/7500 kN ratings belong to this exact execution (C 3168 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 3168 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 4900/7500 kN ratings and 205000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Is the C 3168 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3168 M have?",
        "a": "A C 3168 M measures 340 mm bore × 580 mm outside diameter × 190 mm width (13.386 × 22.835 × 7.48 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4900 kN, static C0 7500 kN, fatigue limit Pu 560 kN, reference speed 850 r/min, limiting speed 1,100 r/min, mass about 205000 g."
      },
      {
        "q": "What does C 3168 M mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 340 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3168-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 340×580×190 mm ISO 15 envelope and equivalent catalogue C/C0; C 3168 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23168",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 340×580×190 mm envelope as the SKF spherical roller bearing SKF 23168 CC/W33, but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23168-CCK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 340×580×190 mm envelope as the SKF spherical roller bearing SKF 23168 CCK/W33, but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3168-M",
      "C 3168 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3168-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3168 KM",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 190,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4900,
    "static_load_kN": 7500,
    "fatigue_load_limit_kN": 560,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 205000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3168 KM denotes a toroidal roller bearing whose 190 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 3168 KM separates into C (CARB), 31 (dimension series), 68 (340 mm bore) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 340×580×190 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 340 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 340×580×190 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 190 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 190 mm wide cavity does not fill itself.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (205 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3168 KM must float; the two are designed to be used as a pair.",
      "Reference and limiting speeds are different limits: the 850 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 4900/7500 kN ratings belong to this exact execution (C 3168 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 4900/7500 kN ratings and 205000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 3168 KM?",
        "a": "A C 3168 KM measures 340 mm bore × 580 mm outside diameter × 190 mm width (13.386 × 22.835 × 7.48 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4900 kN, static C0 7500 kN, fatigue limit Pu 560 kN, reference speed 850 r/min, limiting speed 1,100 r/min, mass about 205000 g."
      },
      {
        "q": "Can a CARB bearing like C 3168 KM locate the shaft axially?",
        "a": "No — that is the defining feature. C 3168 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3168 KM designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 68 = 340 mm bore (code 68 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (4900 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3168 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3168-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 340×580×190 mm ISO 15 envelope and equivalent catalogue C/C0; C 3168 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23168",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 340×580×190 mm envelope as the SKF spherical roller bearing SKF 23168 CC/W33, but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23168-CCK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 340×580×190 mm envelope as the SKF spherical roller bearing SKF 23168 CCK/W33, but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3168-KM",
      "C 3168 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C4168-K30MB",
    "brand": "SKF",
    "manufacturer_designation": "C 4168 K30MB",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 5600,
    "static_load_kN": 9150,
    "fatigue_load_limit_kN": 680,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 271000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 4168 K30MB is the dimension series 41 CARB toroidal roller bearings member of the CARB range: 340 mm bore, 580 mm OD, 243 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 4168 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K30MB. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 340 mm shaft deflects; the 670 r/min reference and 900 r/min limiting speed are both catalogue values. The 271000 g mass over the 340×580×243 mm envelope yields about 16.47 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 580 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (271 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4168 K30MB must float; the two are designed to be used as a pair.",
      "Never use C 4168 K30MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 5600/9150 kN ratings belong to this exact execution (C 4168 K30MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 5600/9150 kN ratings and 271000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 4168 K30MB have?",
        "a": "A C 4168 K30MB measures 340 mm bore × 580 mm outside diameter × 243 mm width (13.386 × 22.835 × 9.567 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5600 kN, static C0 9150 kN, fatigue limit Pu 680 kN, reference speed 670 r/min, limiting speed 900 r/min, mass about 271000 g."
      },
      {
        "q": "What does C 4168 K30MB mean in SKF part numbering?",
        "a": "C marks CARB; 41 the dimension series; the size code gives 340 mm bore; K30MB is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 4168 K30MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 4168 K30MB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24168",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (340×580×243 mm) SKF spherical roller bearing SKF 24168 ECCJ/W33 with ratings within 10 % — not a drop-in substitute: SKF 24168 ECCJ/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "24168-ECCK30J-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (340×580×243 mm) SKF spherical roller bearing SKF 24168 ECCK30J/W33 with ratings within 10 % — not a drop-in substitute: SKF 24168 ECCK30J/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C4168-K30MB",
      "C 4168 K30MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3972-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3972 M",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 360,
    "D_mm": 480,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1760,
    "static_load_kN": 3250,
    "fatigue_load_limit_kN": 245,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 45000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3972 M is the dimension series 39 CARB toroidal roller bearings member of the CARB range: 360 mm bore, 480 mm OD, 90 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 3972 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 360 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 90 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 90 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (45 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3972 M must float; the two are designed to be used as a pair.",
      "Never use C 3972 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Reference and limiting speeds are different limits: the 1,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 1760/3250 kN ratings belong to this exact execution (C 3972 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 1760/3250 kN ratings and 45000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3972 M have?",
        "a": "A C 3972 M measures 360 mm bore × 480 mm outside diameter × 90 mm width (14.173 × 18.898 × 3.543 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1760 kN, static C0 3250 kN, fatigue limit Pu 245 kN, reference speed 1,000 r/min, limiting speed 1,400 r/min, mass about 45000 g."
      },
      {
        "q": "What does C 3972 M mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 360 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3972 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3972-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 360×480×90 mm ISO 15 envelope and equivalent catalogue C/C0; C 3972 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23972",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 360×480×90 mm envelope as the SKF spherical roller bearing SKF 23972 CC/W33, but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23972-CCK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 360×480×90 mm envelope as the SKF spherical roller bearing SKF 23972 CCK/W33, but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3972-M",
      "C 3972 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3972-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3972 KM",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 360,
    "D_mm": 480,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1760,
    "static_load_kN": 3250,
    "fatigue_load_limit_kN": 245,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 45000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3972 KM denotes a toroidal roller bearing whose 90 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 3972 KM separates into C (CARB), 39 (dimension series), 72 (360 mm bore) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 360×480×90 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 360 mm shaft deflects; the 1,000 r/min reference and 1,400 r/min limiting speed are both catalogue values. The 45000 g mass over the 360×480×90 mm envelope yields about 4.89 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (45 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 1,000 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 1760/3250 kN ratings belong to this exact execution (C 3972 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 3972 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 360 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 1760/3250 kN ratings and 45000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 3972 KM?",
        "a": "A C 3972 KM measures 360 mm bore × 480 mm outside diameter × 90 mm width (14.173 × 18.898 × 3.543 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1760 kN, static C0 3250 kN, fatigue limit Pu 245 kN, reference speed 1,000 r/min, limiting speed 1,400 r/min, mass about 45000 g."
      },
      {
        "q": "Can a CARB bearing like C 3972 KM locate the shaft axially?",
        "a": "No — that is the defining feature. C 3972 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3972 KM designation read?",
        "a": "C = CARB toroidal family; 39 = dimension series; 72 = 360 mm bore (code 72 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (1760 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3972 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3972-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 360×480×90 mm ISO 15 envelope and equivalent catalogue C/C0; C 3972 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23972",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 360×480×90 mm envelope as the SKF spherical roller bearing SKF 23972 CC/W33, but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23972-CCK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 360×480×90 mm envelope as the SKF spherical roller bearing SKF 23972 CCK/W33, but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3972-KM",
      "C 3972 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3072-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3072 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 134,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2900,
    "static_load_kN": 5000,
    "fatigue_load_limit_kN": 375,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 106000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3072 M belongs to the CARB family — compact aligning roller bearings: envelope 360×540×134 mm, radial rating 2900/5000 kN C/C0, and no axial-locating function by design. The designation C 3072 M separates into C (CARB), 30 (dimension series), 72 (360 mm bore) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 360×540×134 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 360 mm shaft deflects; the 900 r/min reference and 1,300 r/min limiting speed are both catalogue values. Speed planning separates the 900 r/min thermal reference from the 1,300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 134 mm wide cavity does not fill itself.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (106 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Never use C 3072 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 360 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 900 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 2900/5000 kN ratings belong to this exact execution (C 3072 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 2900/5000 kN ratings and 106000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 3072 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 3072 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3072 M designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 72 = 360 mm bore (code 72 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (2900 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3072 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      },
      {
        "q": "How is C 3072 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 360 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 134 mm roller set."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3072-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 360×540×134 mm ISO 15 envelope and equivalent catalogue C/C0; C 3072 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3072-M",
      "C 3072 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3072-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3072 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 134,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2900,
    "static_load_kN": 5000,
    "fatigue_load_limit_kN": 375,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 106000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3072 KM: the toroidal rollers allow the 360 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (72) encode the 360 mm bore; suffixes describe bore and execution. The K suffix gives a 1:12 tapered 360 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 360×540×134 mm are identical — only the mounting method changes. The 106000 g mass over the 360×540×134 mm envelope yields about 8.06 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 134 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (106 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 2900/5000 kN ratings belong to this exact execution (C 3072 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 360 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 900 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 2900/5000 kN ratings and 106000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 3072 KM have?",
        "a": "A C 3072 KM measures 360 mm bore × 540 mm outside diameter × 134 mm width (14.173 × 21.26 × 5.276 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2900 kN, static C0 5000 kN, fatigue limit Pu 375 kN, reference speed 900 r/min, limiting speed 1,300 r/min, mass about 106000 g."
      },
      {
        "q": "What does C 3072 KM mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 360 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3072 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3072 KM sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3072-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 360×540×134 mm ISO 15 envelope and equivalent catalogue C/C0; C 3072 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3072-KM",
      "C 3072 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3172-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3172 M",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 5000,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 585,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 220000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3172 M is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 360 mm bore, 600 mm OD, 192 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 3172 M separates into C (CARB), 31 (dimension series), 72 (360 mm bore) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 360×600×192 mm follows the ISO 15 plan. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 360 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 192 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 600 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (220 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3172 M must float; the two are designed to be used as a pair.",
      "Never use C 3172 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 360 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 5000/8000 kN ratings and 220000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the C 3172 M designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 72 = 360 mm bore (code 72 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (5000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3172 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      },
      {
        "q": "How is C 3172 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 360 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 192 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 3172 M?",
        "a": "A C 3172 M measures 360 mm bore × 600 mm outside diameter × 192 mm width (14.173 × 23.622 × 7.559 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5000 kN, static C0 8000 kN, fatigue limit Pu 585 kN, reference speed 800 r/min, limiting speed 1,100 r/min, mass about 220000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3172-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 360×600×192 mm ISO 15 envelope and equivalent catalogue C/C0; C 3172 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23172",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 360×600×192 mm envelope as the SKF spherical roller bearing SKF 23172 CC/W33, but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23172-CCK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 360×600×192 mm envelope as the SKF spherical roller bearing SKF 23172 CCK/W33, but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3172-M",
      "C 3172 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3172-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3172 KM",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 5000,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 585,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 220000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3172 KM belongs to the CARB family — compact aligning roller bearings: envelope 360×600×192 mm, radial rating 5000/8000 kN C/C0, and no axial-locating function by design. The designation C 3172 KM separates into C (CARB), 31 (dimension series), 72 (360 mm bore) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 360×600×192 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 360 mm seat. Selection arithmetic: C 5000 kN against C0 8000 kN gives a C0/C ratio of 1.60, and the 585 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (220 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Never use C 3172 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 360 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 5000/8000 kN ratings belong to this exact execution (C 3172 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 5000/8000 kN ratings and 220000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 864); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the C 3172 KM designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 72 = 360 mm bore (code 72 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (5000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3172 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage."
      },
      {
        "q": "How is C 3172 KM mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 3172 KM?",
        "a": "A C 3172 KM measures 360 mm bore × 600 mm outside diameter × 192 mm width (14.173 × 23.622 × 7.559 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5000 kN, static C0 8000 kN, fatigue limit Pu 585 kN, reference speed 800 r/min, limiting speed 1,100 r/min, mass about 220000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3172-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 360×600×192 mm ISO 15 envelope and equivalent catalogue C/C0; C 3172 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23172",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 360×600×192 mm envelope as the SKF spherical roller bearing SKF 23172 CC/W33, but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23172-CCK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 360×600×192 mm envelope as the SKF spherical roller bearing SKF 23172 CCK/W33, but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3172-KM",
      "C 3172 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3076-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3076 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 135,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3000,
    "static_load_kN": 5200,
    "fatigue_load_limit_kN": 380,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 110000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3076 M is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 380 mm bore, 560 mm OD, 135 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 3076 M the 30 dimension series fixes the 560 mm OD and 135 mm width around the 380 mm bore (code 76 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 380 mm shaft deflects; the 900 r/min reference and 1,200 r/min limiting speed are both catalogue values. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 135 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 135 mm wide cavity does not fill itself.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (110 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Never use C 3076 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 380 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 900 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 3000/5200 kN ratings belong to this exact execution (C 3076 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 3000/5200 kN ratings and 110000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 3076 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 3076 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3076 M designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 76 = 380 mm bore (code 76 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (3000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3076 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      },
      {
        "q": "How is C 3076 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 380 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 135 mm roller set."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3076-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 380×560×135 mm ISO 15 envelope and equivalent catalogue C/C0; C 3076 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3076-M",
      "C 3076 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3076-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3076 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 135,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3000,
    "static_load_kN": 5200,
    "fatigue_load_limit_kN": 380,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 110000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3076 KM denotes a toroidal roller bearing whose 135 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 3076 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. The K suffix gives a 1:12 tapered 380 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 380×560×135 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3076 KM deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (110 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 3000/5200 kN ratings belong to this exact execution (C 3076 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3076 KM must float; the two are designed to be used as a pair.",
      "Never use C 3076 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 3000/5200 kN ratings and 110000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3076 KM have?",
        "a": "A C 3076 KM measures 380 mm bore × 560 mm outside diameter × 135 mm width (14.961 × 22.047 × 5.315 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3000 kN, static C0 5200 kN, fatigue limit Pu 380 kN, reference speed 900 r/min, limiting speed 1,200 r/min, mass about 110000 g."
      },
      {
        "q": "What does C 3076 KM mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 380 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3076 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3076-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 380×560×135 mm ISO 15 envelope and equivalent catalogue C/C0; C 3076 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3076-KM",
      "C 3076 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3176-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 3176 MB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 380,
    "D_mm": 620,
    "B_mm": 194,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4400,
    "static_load_kN": 7200,
    "fatigue_load_limit_kN": 520,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 243000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3176 MB is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 380 mm bore, 620 mm OD, 194 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (76) encode the 380 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 380 mm shaft deflects; the 750 r/min reference and 1,000 r/min limiting speed are both catalogue values. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 194 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 194 mm wide cavity does not fill itself.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (243 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 380 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 750 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3176 MB must float; the two are designed to be used as a pair.",
      "The 4400/7200 kN ratings and 243000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 3176 MB mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 380 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3176 MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3176 MB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3176-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 380×620×194 mm ISO 15 envelope and equivalent catalogue C/C0; C 3176 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23176",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (380×620×194 mm) SKF spherical roller bearing SKF 23176 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23176 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23176-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (380×620×194 mm) SKF spherical roller bearing SKF 23176 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23176 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3176-MB",
      "C 3176 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3176-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 3176 KMB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 380,
    "D_mm": 620,
    "B_mm": 194,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4400,
    "static_load_kN": 7200,
    "fatigue_load_limit_kN": 520,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 243000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3176 KMB: the toroidal rollers allow the 380 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (76) encode the 380 mm bore; suffixes describe bore and execution. The K suffix gives a 1:12 tapered 380 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 380×620×194 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3176 KMB deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (243 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3176 KMB must float; the two are designed to be used as a pair.",
      "Never use C 3176 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 380 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 4400/7200 kN ratings and 243000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3176 KMB have?",
        "a": "A C 3176 KMB measures 380 mm bore × 620 mm outside diameter × 194 mm width (14.961 × 24.409 × 7.638 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4400 kN, static C0 7200 kN, fatigue limit Pu 520 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 243000 g."
      },
      {
        "q": "What does C 3176 KMB mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 380 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3176 KMB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3176-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 380×620×194 mm ISO 15 envelope and equivalent catalogue C/C0; C 3176 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23176",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (380×620×194 mm) SKF spherical roller bearing SKF 23176 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23176 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23176-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (380×620×194 mm) SKF spherical roller bearing SKF 23176 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23176 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3176-KMB",
      "C 3176 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3980-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3980 KM",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2120,
    "static_load_kN": 4000,
    "fatigue_load_limit_kN": 290,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 66500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3980 KM: the toroidal rollers allow the 400 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 3980 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 400 mm seat. Selection arithmetic: C 2120 kN against C0 4000 kN gives a C0/C ratio of 1.89, and the 290 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 106 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (66.5 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 2120/4000 kN ratings belong to this exact execution (C 3980 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Never use C 3980 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 400 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 2120/4000 kN ratings and 66500 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 3980 KM mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 400 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3980 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3980 KM sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23980",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (400×540×106 mm) SKF spherical roller bearing SKF 23980 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23980 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23980-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (400×540×106 mm) SKF spherical roller bearing SKF 23980 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23980 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3980-KM",
      "C 3980 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3080-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3080 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 148,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3650,
    "static_load_kN": 6200,
    "fatigue_load_limit_kN": 450,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 145000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists C 3080 M in the dimension series 30 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. In C 3080 M the 30 dimension series fixes the 600 mm OD and 148 mm width around the 400 mm bore (code 80 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 400 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 148 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 600 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (145 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3080 M must float; the two are designed to be used as a pair.",
      "The quoted 3650/6200 kN ratings belong to this exact execution (C 3080 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 3080 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 3650/6200 kN ratings and 145000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 3080 M?",
        "a": "A C 3080 M measures 400 mm bore × 600 mm outside diameter × 148 mm width (15.748 × 23.622 × 5.827 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3650 kN, static C0 6200 kN, fatigue limit Pu 450 kN, reference speed 800 r/min, limiting speed 1,100 r/min, mass about 145000 g."
      },
      {
        "q": "Can a CARB bearing like C 3080 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 3080 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3080 M designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 80 = 400 mm bore (code 80 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (3650 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3080 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3080-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 400×600×148 mm ISO 15 envelope and equivalent catalogue C/C0; C 3080 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3080-M",
      "C 3080 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3080-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3080 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 148,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3650,
    "static_load_kN": 6200,
    "fatigue_load_limit_kN": 450,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 145000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 3080 KM combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 400 mm bore, 600 mm outside diameter, 148 mm wide unit rated 3650 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 3080 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 400 mm shaft deflects; the 800 r/min reference and 1,100 r/min limiting speed are both catalogue values. Speed planning separates the 800 r/min thermal reference from the 1,100 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (145 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3080 KM must float; the two are designed to be used as a pair.",
      "Never use C 3080 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 400 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 3650/6200 kN ratings and 145000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 3080 KM mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 400 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3080 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3080 KM sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3080-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 400×600×148 mm ISO 15 envelope and equivalent catalogue C/C0; C 3080 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3080-KM",
      "C 3080 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3180-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3180 M",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 400,
    "D_mm": 650,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4800,
    "static_load_kN": 8300,
    "fatigue_load_limit_kN": 585,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 258000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3180 M denotes a toroidal roller bearing whose 200 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 3180 M the 31 dimension series fixes the 650 mm OD and 200 mm width around the 400 mm bore (code 80 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 400 mm shaft deflects; the 700 r/min reference and 950 r/min limiting speed are both catalogue values. Selection arithmetic: C 4800 kN against C0 8300 kN gives a C0/C ratio of 1.73, and the 585 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (258 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 4800/8300 kN ratings belong to this exact execution (C 3180 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 3180 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 400 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 4800/8300 kN ratings and 258000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 3180 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 3180 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3180 M designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 80 = 400 mm bore (code 80 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (4800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3180 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      },
      {
        "q": "How is C 3180 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 400 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 200 mm roller set."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3180-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 400×650×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 3180 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23180",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (400×650×200 mm) SKF spherical roller bearing SKF 23180 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23180 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23180-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (400×650×200 mm) SKF spherical roller bearing SKF 23180 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23180 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3180-M",
      "C 3180 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3180-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3180 KM",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 400,
    "D_mm": 650,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4800,
    "static_load_kN": 8300,
    "fatigue_load_limit_kN": 585,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 258000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3180 KM is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 400 mm bore, 650 mm OD, 200 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 3180 KM the 31 dimension series fixes the 650 mm OD and 200 mm width around the 400 mm bore (code 80 × 5); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The K suffix gives a 1:12 tapered 400 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 400×650×200 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3180 KM deliberately carries none. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 200 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (258 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 4800/8300 kN ratings belong to this exact execution (C 3180 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3180 KM must float; the two are designed to be used as a pair.",
      "Never use C 3180 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 4800/8300 kN ratings and 258000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (4800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3180 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage."
      },
      {
        "q": "How is C 3180 KM mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 3180 KM?",
        "a": "A C 3180 KM measures 400 mm bore × 650 mm outside diameter × 200 mm width (15.748 × 25.591 × 7.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4800 kN, static C0 8300 kN, fatigue limit Pu 585 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 258000 g."
      },
      {
        "q": "Can a CARB bearing like C 3180 KM locate the shaft axially?",
        "a": "No — that is the defining feature. C 3180 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3180-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 400×650×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 3180 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23180",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (400×650×200 mm) SKF spherical roller bearing SKF 23180 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23180 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23180-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (400×650×200 mm) SKF spherical roller bearing SKF 23180 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23180 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3180-KM",
      "C 3180 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3984-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3984 M",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 420,
    "D_mm": 560,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2160,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 310,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 72000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3984 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 420×560×106 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 3984 M the 39 dimension series fixes the 560 mm OD and 106 mm width around the 420 mm bore (code 84 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 420 mm shaft deflects; the 850 r/min reference and 1,200 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3984 M deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (72 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3984 M must float; the two are designed to be used as a pair.",
      "Never use C 3984 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 420 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 2160/4250 kN ratings and 72000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 3984 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 420 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 106 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 3984 M?",
        "a": "A C 3984 M measures 420 mm bore × 560 mm outside diameter × 106 mm width (16.535 × 22.047 × 4.173 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2160 kN, static C0 4250 kN, fatigue limit Pu 310 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 72000 g."
      },
      {
        "q": "Can a CARB bearing like C 3984 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 3984 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3984 M designation read?",
        "a": "C = CARB toroidal family; 39 = dimension series; 84 = 420 mm bore (code 84 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3984-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 420×560×106 mm ISO 15 envelope and equivalent catalogue C/C0; C 3984 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23984",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (420×560×106 mm) SKF spherical roller bearing SKF 23984 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23984 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23984-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (420×560×106 mm) SKF spherical roller bearing SKF 23984 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23984 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3984-M",
      "C 3984 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3984-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3984 KM",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 420,
    "D_mm": 560,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2160,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 310,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 72000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3984 KM denotes a toroidal roller bearing whose 106 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (84) encode the 420 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 420 mm shaft deflects; the 850 r/min reference and 1,200 r/min limiting speed are both catalogue values. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 106 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 560 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (72 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 2160/4250 kN ratings belong to this exact execution (C 3984 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 420 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 850 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 2160/4250 kN ratings and 72000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 3984 KM mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 420 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3984 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3984 KM sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3984-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 420×560×106 mm ISO 15 envelope and equivalent catalogue C/C0; C 3984 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23984",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (420×560×106 mm) SKF spherical roller bearing SKF 23984 CC/W33 with ratings within 10 % — not a drop-in substitute: SKF 23984 CC/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23984-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (420×560×106 mm) SKF spherical roller bearing SKF 23984 CCK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23984 CCK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3984-KM",
      "C 3984 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3084-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3084 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3800,
    "static_load_kN": 6400,
    "fatigue_load_limit_kN": 455,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 150000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 3084 M: the toroidal rollers allow the 420 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. The designation C 3084 M separates into C (CARB), 30 (dimension series), 84 (420 mm bore) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 420×620×150 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 420 mm seat. Speed planning separates the 800 r/min thermal reference from the 1,100 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (150 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3084 M must float; the two are designed to be used as a pair.",
      "Never use C 3084 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 420 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 3800/6400 kN ratings and 150000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 3084 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 3084 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3084 M designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 84 = 420 mm bore (code 84 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (3800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3084 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      },
      {
        "q": "How is C 3084 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 420 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 150 mm roller set."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3084-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 420×620×150 mm ISO 15 envelope and equivalent catalogue C/C0; C 3084 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3084-M",
      "C 3084 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3084-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3084 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3800,
    "static_load_kN": 6400,
    "fatigue_load_limit_kN": 455,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 150000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3084 KM is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 420×620×150 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (84) encode the 420 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 420 mm shaft deflects; the 800 r/min reference and 1,100 r/min limiting speed are both catalogue values. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 150 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 620 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (150 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3084 KM must float; the two are designed to be used as a pair.",
      "Never use C 3084 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 420 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 800 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 3800/6400 kN ratings and 150000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 3084 KM have?",
        "a": "A C 3084 KM measures 420 mm bore × 620 mm outside diameter × 150 mm width (16.535 × 24.409 × 5.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3800 kN, static C0 6400 kN, fatigue limit Pu 455 kN, reference speed 800 r/min, limiting speed 1,100 r/min, mass about 150000 g."
      },
      {
        "q": "What does C 3084 KM mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 420 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3084 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3084 KM sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3084-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 420×620×150 mm ISO 15 envelope and equivalent catalogue C/C0; C 3084 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3084-KM",
      "C 3084 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3184-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3184 M",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 420,
    "D_mm": 700,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6000,
    "static_load_kN": 10400,
    "fatigue_load_limit_kN": 720,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 355000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3184 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 420×700×224 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 3184 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 420 mm shaft deflects; the 670 r/min reference and 900 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3184 M deliberately carries none. Mounting: slide the bearing onto the 420 mm seat or heat it (max 120 °C) and seat it square; never press through the 224 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (355 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 6000/10400 kN ratings belong to this exact execution (C 3184 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Never use C 3184 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 420 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 6000/10400 kN ratings and 355000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is C 3184 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3184 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3184 M have?",
        "a": "A C 3184 M measures 420 mm bore × 700 mm outside diameter × 224 mm width (16.535 × 27.559 × 8.819 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6000 kN, static C0 10400 kN, fatigue limit Pu 720 kN, reference speed 670 r/min, limiting speed 900 r/min, mass about 355000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3184-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 420×700×224 mm ISO 15 envelope and equivalent catalogue C/C0; C 3184 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23184",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 420×700×224 mm envelope as the SKF spherical roller bearing SKF 23184 CJ/W33, but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23184-CKJ-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 420×700×224 mm envelope as the SKF spherical roller bearing SKF 23184 CKJ/W33, but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3184-M",
      "C 3184 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3184-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3184 KM",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 420,
    "D_mm": 700,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6000,
    "static_load_kN": 10400,
    "fatigue_load_limit_kN": 720,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 355000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3184 KM belongs to the CARB family — compact aligning roller bearings: envelope 420×700×224 mm, radial rating 6000/10400 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (84) encode the 420 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 420 mm seat. Speed planning separates the 670 r/min thermal reference from the 900 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 700 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (355 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 420 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 670 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 6000/10400 kN ratings belong to this exact execution (C 3184 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 6000/10400 kN ratings and 355000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Is the C 3184 KM sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3184 KM have?",
        "a": "A C 3184 KM measures 420 mm bore × 700 mm outside diameter × 224 mm width (16.535 × 27.559 × 8.819 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6000 kN, static C0 10400 kN, fatigue limit Pu 720 kN, reference speed 670 r/min, limiting speed 900 r/min, mass about 355000 g."
      },
      {
        "q": "What does C 3184 KM mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 420 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3184-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 420×700×224 mm ISO 15 envelope and equivalent catalogue C/C0; C 3184 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23184",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 420×700×224 mm envelope as the SKF spherical roller bearing SKF 23184 CJ/W33, but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23184-CKJ-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 420×700×224 mm envelope as the SKF spherical roller bearing SKF 23184 CKJ/W33, but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3184-KM",
      "C 3184 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3088-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 3088 MB",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 157,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3750,
    "static_load_kN": 6400,
    "fatigue_load_limit_kN": 450,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 190000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 3088 MB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 440 mm bore, 650 mm outside diameter, 157 mm wide unit rated 3750 kN dynamic. In C 3088 MB the 30 dimension series fixes the 650 mm OD and 157 mm width around the 440 mm bore (code 88 × 5); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The cylindrical 440 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 440×650×157 mm are identical — only the mounting method changes. The 190000 g mass over the 440×650×157 mm envelope yields about 8.52 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (190 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Never use C 3088 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 440 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3088 MB must float; the two are designed to be used as a pair.",
      "The 3750/6400 kN ratings and 190000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 3088 MB?",
        "a": "A C 3088 MB measures 440 mm bore × 650 mm outside diameter × 157 mm width (17.323 × 25.591 × 6.181 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3750 kN, static C0 6400 kN, fatigue limit Pu 450 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 190000 g."
      },
      {
        "q": "Can a CARB bearing like C 3088 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 3088 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3088 MB designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 88 = 440 mm bore (code 88 × 5); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (3750 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3088 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3088-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 440×650×157 mm ISO 15 envelope and equivalent catalogue C/C0; C 3088 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3088-MB",
      "C 3088 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3088-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 3088 KMB",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 157,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3750,
    "static_load_kN": 6400,
    "fatigue_load_limit_kN": 450,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 190000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3088 KMB belongs to the CARB family — compact aligning roller bearings: envelope 440×650×157 mm, radial rating 3750/6400 kN C/C0, and no axial-locating function by design. In C 3088 KMB the 30 dimension series fixes the 650 mm OD and 157 mm width around the 440 mm bore (code 88 × 5); the suffix KMB then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 440 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 157 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 157 mm wide cavity does not fill itself.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (190 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Never use C 3088 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 440 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 750 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 3750/6400 kN ratings belong to this exact execution (C 3088 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 3750/6400 kN ratings and 190000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (3750 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3088 KMB is the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 3088 KMB mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 3088 KMB?",
        "a": "A C 3088 KMB measures 440 mm bore × 650 mm outside diameter × 157 mm width (17.323 × 25.591 × 6.181 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3750 kN, static C0 6400 kN, fatigue limit Pu 450 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 190000 g."
      },
      {
        "q": "Can a CARB bearing like C 3088 KMB locate the shaft axially?",
        "a": "No — that is the defining feature. C 3088 KMB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3088-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 440×650×157 mm ISO 15 envelope and equivalent catalogue C/C0; C 3088 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3088-KMB",
      "C 3088 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3188-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 3188 MB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 226,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6700,
    "static_load_kN": 11400,
    "fatigue_load_limit_kN": 780,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 385000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3188 MB is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 440 mm bore, 720 mm OD, 226 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 3188 MB the 31 dimension series fixes the 720 mm OD and 226 mm width around the 440 mm bore (code 88 × 5); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 440 mm shaft deflects; the 630 r/min reference and 850 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3188 MB deliberately carries none. Mounting: slide the bearing onto the 440 mm seat or heat it (max 120 °C) and seat it square; never press through the 226 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (385 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 630 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 6700/11400 kN ratings belong to this exact execution (C 3188 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3188 MB must float; the two are designed to be used as a pair.",
      "Never use C 3188 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 6700/11400 kN ratings and 385000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the C 3188 MB designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 88 = 440 mm bore (code 88 × 5); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (6700 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3188 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 3188 MB mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 440 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 226 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 3188 MB?",
        "a": "A C 3188 MB measures 440 mm bore × 720 mm outside diameter × 226 mm width (17.323 × 28.346 × 8.898 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6700 kN, static C0 11400 kN, fatigue limit Pu 780 kN, reference speed 630 r/min, limiting speed 850 r/min, mass about 385000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3188-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 440×720×226 mm ISO 15 envelope and equivalent catalogue C/C0; C 3188 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23188",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 440×720×226 mm envelope as the SKF spherical roller bearing SKF 23188 CA/W33, but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23188-CAK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 440×720×226 mm envelope as the SKF spherical roller bearing SKF 23188 CAK/W33, but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3188-MB",
      "C 3188 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3188-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 3188 KMB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 226,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6700,
    "static_load_kN": 11400,
    "fatigue_load_limit_kN": 780,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 385000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3188 KMB is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 440 mm bore, 720 mm OD, 226 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 3188 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KMB. The K suffix gives a 1:12 tapered 440 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 440×720×226 mm are identical — only the mounting method changes. The 385000 g mass over the 440×720×226 mm envelope yields about 15.23 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 720 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (385 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3188 KMB must float; the two are designed to be used as a pair.",
      "Never use C 3188 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 6700/11400 kN ratings belong to this exact execution (C 3188 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 6700/11400 kN ratings and 385000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Is the C 3188 KMB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3188 KMB have?",
        "a": "A C 3188 KMB measures 440 mm bore × 720 mm outside diameter × 226 mm width (17.323 × 28.346 × 8.898 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6700 kN, static C0 11400 kN, fatigue limit Pu 780 kN, reference speed 630 r/min, limiting speed 850 r/min, mass about 385000 g."
      },
      {
        "q": "What does C 3188 KMB mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 440 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3188-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 440×720×226 mm ISO 15 envelope and equivalent catalogue C/C0; C 3188 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23188",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 440×720×226 mm envelope as the SKF spherical roller bearing SKF 23188 CA/W33, but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23188-CAK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 440×720×226 mm envelope as the SKF spherical roller bearing SKF 23188 CAK/W33, but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3188-KMB",
      "C 3188 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C4188-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 4188 MB",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 7500,
    "static_load_kN": 12900,
    "fatigue_load_limit_kN": 900,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "weight_g": 471000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists C 4188 MB in the dimension series 41 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 4188 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here MB. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 440 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 280 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 280 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (471 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 440 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 4188 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 7500/12900 kN ratings belong to this exact execution (C 4188 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 7500/12900 kN ratings and 471000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is C 4188 MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 4188 MB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 4188 MB have?",
        "a": "A C 4188 MB measures 440 mm bore × 720 mm outside diameter × 280 mm width (17.323 × 28.346 × 11.024 in). From SKF catalogue PUB BU/P1 17000: dynamic C 7500 kN, static C0 12900 kN, fatigue limit Pu 900 kN, reference speed 500 r/min, limiting speed 670 r/min, mass about 471000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C4188-K30MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 440×720×280 mm ISO 15 envelope and equivalent catalogue C/C0; C 4188 K30MB is the 1:30 tapered-bore K30 MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "24188",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (440×720×280 mm) SKF spherical roller bearing SKF 24188 ECA/W33 with ratings within 10 % — not a drop-in substitute: SKF 24188 ECA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "24188-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (440×720×280 mm) SKF spherical roller bearing SKF 24188 ECAK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24188 ECAK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C4188-MB",
      "C 4188 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C4188-K30MB",
    "brand": "SKF",
    "manufacturer_designation": "C 4188 K30MB",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 7500,
    "static_load_kN": 12900,
    "fatigue_load_limit_kN": 900,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "weight_g": 471000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists C 4188 K30MB in the dimension series 41 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (41) identify the ISO dimension series and the last two (88) encode the 440 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 440 mm seat. Selection arithmetic: C 7500 kN against C0 12900 kN gives a C0/C ratio of 1.72, and the 900 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 720 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (471 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 7500/12900 kN ratings belong to this exact execution (C 4188 K30MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 440 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 7500/12900 kN ratings and 471000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 4188 K30MB have?",
        "a": "A C 4188 K30MB measures 440 mm bore × 720 mm outside diameter × 280 mm width (17.323 × 28.346 × 11.024 in). From SKF catalogue PUB BU/P1 17000: dynamic C 7500 kN, static C0 12900 kN, fatigue limit Pu 900 kN, reference speed 500 r/min, limiting speed 670 r/min, mass about 471000 g."
      },
      {
        "q": "What does C 4188 K30MB mean in SKF part numbering?",
        "a": "C marks CARB; 41 the dimension series; the size code gives 440 mm bore; K30MB is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 4188 K30MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 4188 K30MB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C4188-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 440×720×280 mm ISO 15 envelope and equivalent catalogue C/C0; C 4188 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "24188",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (440×720×280 mm) SKF spherical roller bearing SKF 24188 ECA/W33 with ratings within 10 % — not a drop-in substitute: SKF 24188 ECA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "24188-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (440×720×280 mm) SKF spherical roller bearing SKF 24188 ECAK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24188 ECAK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C4188-K30MB",
      "C 4188 K30MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3092-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3092 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 163,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4000,
    "static_load_kN": 7500,
    "fatigue_load_limit_kN": 520,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 205000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 3092 M combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 460 mm bore, 680 mm outside diameter, 163 mm wide unit rated 4000 kN dynamic. In C 3092 M the 30 dimension series fixes the 680 mm OD and 163 mm width around the 460 mm bore (code 92 × 5); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The cylindrical 460 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 460×680×163 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 163 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: slide the bearing onto the 460 mm seat or heat it (max 120 °C) and seat it square; never press through the 163 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (205 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 4000/7500 kN ratings belong to this exact execution (C 3092 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Never use C 3092 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 4000/7500 kN ratings and 205000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 3092 M?",
        "a": "A C 3092 M measures 460 mm bore × 680 mm outside diameter × 163 mm width (18.11 × 26.772 × 6.417 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4000 kN, static C0 7500 kN, fatigue limit Pu 520 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 205000 g."
      },
      {
        "q": "Can a CARB bearing like C 3092 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 3092 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3092 M designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 92 = 460 mm bore (code 92 × 5); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (4000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3092 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3092-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 460×680×163 mm ISO 15 envelope and equivalent catalogue C/C0; C 3092 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3092-M",
      "C 3092 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3092-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3092 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 163,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4000,
    "static_load_kN": 7500,
    "fatigue_load_limit_kN": 520,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 205000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 3092 KM combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 460 mm bore, 680 mm outside diameter, 163 mm wide unit rated 4000 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 3092 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 460 mm shaft deflects; the 700 r/min reference and 950 r/min limiting speed are both catalogue values. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 163 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 680 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (205 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3092 KM must float; the two are designed to be used as a pair.",
      "Never use C 3092 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 4000/7500 kN ratings and 205000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is C 3092 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3092 KM sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3092 KM have?",
        "a": "A C 3092 KM measures 460 mm bore × 680 mm outside diameter × 163 mm width (18.11 × 26.772 × 6.417 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4000 kN, static C0 7500 kN, fatigue limit Pu 520 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 205000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3092-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 460×680×163 mm ISO 15 envelope and equivalent catalogue C/C0; C 3092 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3092-KM",
      "C 3092 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3192-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3192 M",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 240,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6800,
    "static_load_kN": 12000,
    "fatigue_load_limit_kN": 815,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 435000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3192 M belongs to the CARB family — compact aligning roller bearings: envelope 460×760×240 mm, radial rating 6800/12000 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (92) encode the 460 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 460 mm seat. Speed planning separates the 600 r/min thermal reference from the 800 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 240 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (435 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 3192 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 6800/12000 kN ratings belong to this exact execution (C 3192 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 6800/12000 kN ratings and 435000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 3192 M mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 460 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3192 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3192 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3192-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 460×760×240 mm ISO 15 envelope and equivalent catalogue C/C0; C 3192 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23192",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 460×760×240 mm envelope as the SKF spherical roller bearing SKF 23192 CA/W33, but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23192-CAK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 460×760×240 mm envelope as the SKF spherical roller bearing SKF 23192 CAK/W33, but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3192-M",
      "C 3192 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3192-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3192 KM",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 240,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6800,
    "static_load_kN": 12000,
    "fatigue_load_limit_kN": 815,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 435000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3192 KM is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 460 mm bore, 760 mm OD, 240 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. SKF builds the CARB order number from size plus execution: the bare number C 3192 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. The K suffix gives a 1:12 tapered 460 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 460×760×240 mm are identical — only the mounting method changes. Selection arithmetic: C 6800 kN against C0 12000 kN gives a C0/C ratio of 1.76, and the 815 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (435 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 6800/12000 kN ratings belong to this exact execution (C 3192 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Never use C 3192 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 6800/12000 kN ratings and 435000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3192 KM have?",
        "a": "A C 3192 KM measures 460 mm bore × 760 mm outside diameter × 240 mm width (18.11 × 29.921 × 9.449 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6800 kN, static C0 12000 kN, fatigue limit Pu 815 kN, reference speed 600 r/min, limiting speed 800 r/min, mass about 435000 g."
      },
      {
        "q": "What does C 3192 KM mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 460 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3192 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3192-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 460×760×240 mm ISO 15 envelope and equivalent catalogue C/C0; C 3192 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23192",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 460×760×240 mm envelope as the SKF spherical roller bearing SKF 23192 CA/W33, but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      },
      {
        "equiv_sku": "23192-CAK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 460×760×240 mm envelope as the SKF spherical roller bearing SKF 23192 CAK/W33, but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN) — and the functions differ: spherical locates axially, CARB floats. Pair them; never swap one-for-one."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3192-KM",
      "C 3192 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C4192-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 4192 MB",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 8650,
    "static_load_kN": 15000,
    "fatigue_load_limit_kN": 1020,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 630,
    "max_rpm": 630,
    "weight_g": 571000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 4192 MB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 460×760×300 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 4192 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here MB. The MB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Selection arithmetic: C 8650 kN against C0 15000 kN gives a C0/C ratio of 1.73, and the 1020 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 300 mm wide cavity does not fill itself.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (571 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 8650/15000 kN ratings belong to this exact execution (C 4192 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Never use C 4192 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 8650/15000 kN ratings and 571000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 4192 MB have?",
        "a": "A C 4192 MB measures 460 mm bore × 760 mm outside diameter × 300 mm width (18.11 × 29.921 × 11.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8650 kN, static C0 15000 kN, fatigue limit Pu 1020 kN, reference speed 480 r/min, limiting speed 630 r/min, mass about 571000 g."
      },
      {
        "q": "What does C 4192 MB mean in SKF part numbering?",
        "a": "C marks CARB; 41 the dimension series; the size code gives 460 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 4192 MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C4192-K30MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 460×760×300 mm ISO 15 envelope and equivalent catalogue C/C0; C 4192 K30MB is the 1:30 tapered-bore K30 MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "24192",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (460×760×300 mm) SKF spherical roller bearing SKF 24192 ECA/W33 with ratings within 10 % — not a drop-in substitute: SKF 24192 ECA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "24192-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (460×760×300 mm) SKF spherical roller bearing SKF 24192 ECAK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24192 ECAK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C4192-MB",
      "C 4192 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C4192-K30MB",
    "brand": "SKF",
    "manufacturer_designation": "C 4192 K30MB",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 8650,
    "static_load_kN": 15000,
    "fatigue_load_limit_kN": 1020,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 630,
    "max_rpm": 630,
    "weight_g": 571000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 4192 K30MB belongs to the CARB family — compact aligning roller bearings: envelope 460×760×300 mm, radial rating 8650/15000 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 4192 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K30MB. The K30 suffix gives a 1:30 tapered 460 mm bore, mounted on a withdrawal (AH) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 460×760×300 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 300 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: mount on the withdrawal (AH) sleeve matched to the 1:30 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 300 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (571 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 480 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 4192 K30MB must float; the two are designed to be used as a pair.",
      "Never use C 4192 K30MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 8650/15000 kN ratings and 571000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 4192 K30MB have?",
        "a": "A C 4192 K30MB measures 460 mm bore × 760 mm outside diameter × 300 mm width (18.11 × 29.921 × 11.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8650 kN, static C0 15000 kN, fatigue limit Pu 1020 kN, reference speed 480 r/min, limiting speed 630 r/min, mass about 571000 g."
      },
      {
        "q": "What does C 4192 K30MB mean in SKF part numbering?",
        "a": "C marks CARB; 41 the dimension series; the size code gives 460 mm bore; K30MB is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 4192 K30MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C4192-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 460×760×300 mm ISO 15 envelope and equivalent catalogue C/C0; C 4192 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "24192",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (460×760×300 mm) SKF spherical roller bearing SKF 24192 ECA/W33 with ratings within 10 % — not a drop-in substitute: SKF 24192 ECA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "24192-ECAK30-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (460×760×300 mm) SKF spherical roller bearing SKF 24192 ECAK30/W33 with ratings within 10 % — not a drop-in substitute: SKF 24192 ECAK30/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C4192-K30MB",
      "C 4192 K30MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3292-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 3292 MB",
    "series": "C3200-series",
    "type": "carb_toroidal",
    "d_mm": 460,
    "D_mm": 830,
    "B_mm": 296,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9300,
    "static_load_kN": 15000,
    "fatigue_load_limit_kN": 1000,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 735000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3292 MB belongs to the CARB family — compact aligning roller bearings: envelope 460×830×296 mm, radial rating 9300/15000 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (32) identify the ISO dimension series and the last two (92) encode the 460 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 460 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3292 MB deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (735 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 530 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 3292 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 9300/15000 kN ratings belong to this exact execution (C 3292 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 9300/15000 kN ratings and 735000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 3292 MB mean in SKF part numbering?",
        "a": "C marks CARB; 32 the dimension series; the size code gives 460 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3292 MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3292 MB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3292-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 460×830×296 mm ISO 15 envelope and equivalent catalogue C/C0; C 3292 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23292",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (460×830×296 mm) SKF spherical roller bearing SKF 23292 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23292 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23292-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (460×830×296 mm) SKF spherical roller bearing SKF 23292 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23292 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3292-MB",
      "C 3292 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3292-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 3292 KMB",
    "series": "C3200-series",
    "type": "carb_toroidal",
    "d_mm": 460,
    "D_mm": 830,
    "B_mm": 296,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9300,
    "static_load_kN": 15000,
    "fatigue_load_limit_kN": 1000,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 735000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3292 KMB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 460×830×296 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 3292 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KMB. The K suffix gives a 1:12 tapered 460 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 460×830×296 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3292 KMB deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 296 mm wide cavity does not fill itself.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (735 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 9300/15000 kN ratings belong to this exact execution (C 3292 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Never use C 3292 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 460 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 9300/15000 kN ratings and 735000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 3292 KMB have?",
        "a": "A C 3292 KMB measures 460 mm bore × 830 mm outside diameter × 296 mm width (18.11 × 32.677 × 11.654 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9300 kN, static C0 15000 kN, fatigue limit Pu 1000 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 735000 g."
      },
      {
        "q": "What does C 3292 KMB mean in SKF part numbering?",
        "a": "C marks CARB; 32 the dimension series; the size code gives 460 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3292 KMB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3292 KMB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3292-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 460×830×296 mm ISO 15 envelope and equivalent catalogue C/C0; C 3292 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23292",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (460×830×296 mm) SKF spherical roller bearing SKF 23292 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23292 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23292-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (460×830×296 mm) SKF spherical roller bearing SKF 23292 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23292 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3292-KMB",
      "C 3292 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3996-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3996 M",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 480,
    "D_mm": 650,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3100,
    "static_load_kN": 6100,
    "fatigue_load_limit_kN": 425,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists C 3996 M in the dimension series 39 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (96) encode the 480 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 480 mm seat. Selection arithmetic: C 3100 kN against C0 6100 kN gives a C0/C ratio of 1.97, and the 425 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 128 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (120 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 3100/6100 kN ratings belong to this exact execution (C 3996 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3996 M must float; the two are designed to be used as a pair.",
      "Never use C 3996 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 3100/6100 kN ratings and 120000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 3996 M have?",
        "a": "A C 3996 M measures 480 mm bore × 650 mm outside diameter × 128 mm width (18.898 × 25.591 × 5.039 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3100 kN, static C0 6100 kN, fatigue limit Pu 425 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 120000 g."
      },
      {
        "q": "What does C 3996 M mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 480 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3996 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23996",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (480×650×128 mm) SKF spherical roller bearing SKF 23996 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23996 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23996-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (480×650×128 mm) SKF spherical roller bearing SKF 23996 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23996 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3996-M",
      "C 3996 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3096-M",
    "brand": "SKF",
    "manufacturer_designation": "C 3096 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4050,
    "static_load_kN": 7800,
    "fatigue_load_limit_kN": 530,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 215000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3096 M belongs to the CARB family — compact aligning roller bearings: envelope 480×700×165 mm, radial rating 4050/7800 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 3096 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 480 mm seat. The 215000 g mass over the 480×700×165 mm envelope yields about 8.44 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (215 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 4050/7800 kN ratings belong to this exact execution (C 3096 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Reference and limiting speeds are different limits: the 670 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 3096 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 4050/7800 kN ratings and 215000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 3096 M mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 480 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 3096 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 3096 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3096-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 480×700×165 mm ISO 15 envelope and equivalent catalogue C/C0; C 3096 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3096-M",
      "C 3096 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3096-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 3096 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4050,
    "static_load_kN": 7800,
    "fatigue_load_limit_kN": 530,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 215000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3096 KM is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 480×700×165 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 3096 KM the 30 dimension series fixes the 700 mm OD and 165 mm width around the 480 mm bore (code 96 × 5); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 480 mm shaft deflects; the 670 r/min reference and 900 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3096 KM deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 165 mm wide cavity does not fill itself.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (215 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Never use C 3096 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 480 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 670 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 4050/7800 kN ratings belong to this exact execution (C 3096 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 4050/7800 kN ratings and 215000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 3096 KM locate the shaft axially?",
        "a": "No — that is the defining feature. C 3096 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 3096 KM designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 96 = 480 mm bore (code 96 × 5); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (4050 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3096 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage."
      },
      {
        "q": "How is C 3096 KM mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3096-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 480×700×165 mm ISO 15 envelope and equivalent catalogue C/C0; C 3096 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3096-KM",
      "C 3096 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3196-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 3196 MB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 480,
    "D_mm": 790,
    "B_mm": 248,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6950,
    "static_load_kN": 12500,
    "fatigue_load_limit_kN": 830,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 523000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 3196 MB denotes a toroidal roller bearing whose 248 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 3196 MB separates into C (CARB), 31 (dimension series), 96 (480 mm bore) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 480×790×248 mm follows the ISO 15 plan. The cylindrical 480 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 480×790×248 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 248 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (523 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3196 MB must float; the two are designed to be used as a pair.",
      "Reference and limiting speeds are different limits: the 560 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 6950/12500 kN ratings belong to this exact execution (C 3196 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 6950/12500 kN ratings and 523000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (6950 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3196 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 3196 MB mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 480 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 248 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 3196 MB?",
        "a": "A C 3196 MB measures 480 mm bore × 790 mm outside diameter × 248 mm width (18.898 × 31.102 × 9.764 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6950 kN, static C0 12500 kN, fatigue limit Pu 830 kN, reference speed 560 r/min, limiting speed 750 r/min, mass about 523000 g."
      },
      {
        "q": "Can a CARB bearing like C 3196 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 3196 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3196-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 480×790×248 mm ISO 15 envelope and equivalent catalogue C/C0; C 3196 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23196",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (480×790×248 mm) SKF spherical roller bearing SKF 23196 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23196 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23196-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (480×790×248 mm) SKF spherical roller bearing SKF 23196 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23196 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3196-MB",
      "C 3196 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C3196-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 3196 KMB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 480,
    "D_mm": 790,
    "B_mm": 248,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6950,
    "static_load_kN": 12500,
    "fatigue_load_limit_kN": 830,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 523000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 3196 KMB is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 480 mm bore, 790 mm OD, 248 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 3196 KMB separates into C (CARB), 31 (dimension series), 96 (480 mm bore) and KMB (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)); envelope 480×790×248 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 480 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 480×790×248 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 3196 KMB deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 248 mm wide cavity does not fill itself.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (523 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 3196 KMB must float; the two are designed to be used as a pair.",
      "Never use C 3196 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 480 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 6950/12500 kN ratings and 523000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (6950 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 3196 KMB is the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 3196 KMB mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 3196 KMB?",
        "a": "A C 3196 KMB measures 480 mm bore × 790 mm outside diameter × 248 mm width (18.898 × 31.102 × 9.764 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6950 kN, static C0 12500 kN, fatigue limit Pu 830 kN, reference speed 560 r/min, limiting speed 750 r/min, mass about 523000 g."
      },
      {
        "q": "Can a CARB bearing like C 3196 KMB locate the shaft axially?",
        "a": "No — that is the defining feature. C 3196 KMB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C3196-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 480×790×248 mm ISO 15 envelope and equivalent catalogue C/C0; C 3196 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      },
      {
        "equiv_sku": "23196",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (480×790×248 mm) SKF spherical roller bearing SKF 23196 CA/W33 with ratings within 10 % — not a drop-in substitute: SKF 23196 CA/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      },
      {
        "equiv_sku": "23196-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Envelope-identical (480×790×248 mm) SKF spherical roller bearing SKF 23196 CAK/W33 with ratings within 10 % — not a drop-in substitute: SKF 23196 CAK/W33 locates the shaft axially while the CARB bearing must float; the two are designed to run as a locating/non-locating pair."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C3196-KMB",
      "C 3196 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-500-M",
    "brand": "SKF",
    "manufacturer_designation": "C 39/500 M",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 500,
    "D_mm": 670,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3150,
    "static_load_kN": 6300,
    "fatigue_load_limit_kN": 430,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 125000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 39/500 M denotes a toroidal roller bearing whose 128 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 39/500 M the 39 dimension series fixes the 670 mm OD and 128 mm width around the 500 mm bore (the bore is written directly after the slash (no bore code)); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 500 mm and larger sizes needing robust guidance under heavy load. Speed planning separates the 700 r/min thermal reference from the 950 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (125 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 3150/6300 kN ratings belong to this exact execution (C 39/500 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 39/500 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 500 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 3150/6300 kN ratings and 125000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 39/500 M?",
        "a": "A C 39/500 M measures 500 mm bore × 670 mm outside diameter × 128 mm width (19.685 × 26.378 × 5.039 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3150 kN, static C0 6300 kN, fatigue limit Pu 430 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 125000 g."
      },
      {
        "q": "Can a CARB bearing like C 39/500 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 39/500 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 39/500 M designation read?",
        "a": "C = CARB toroidal family; 39 = dimension series; 500 mm (slash-size) = 500 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (3150 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 39/500 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-500-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 500×670×128 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/500 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-500-M",
      "C 39/500 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-500-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 39/500 KM",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 500,
    "D_mm": 670,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3150,
    "static_load_kN": 6300,
    "fatigue_load_limit_kN": 430,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 125000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 39/500 KM combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 500 mm bore, 670 mm outside diameter, 128 mm wide unit rated 3150 kN dynamic. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (500 mm (slash-size)) encode the 500 mm bore; suffixes describe bore and execution. The KM suffix is a one-piece machined brass cage centred on the rollers, supplied for the 500 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 128 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 670 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (125 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 500 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 700 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 3150/6300 kN ratings belong to this exact execution (C 39/500 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 3150/6300 kN ratings and 125000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 39/500 KM have?",
        "a": "A C 39/500 KM measures 500 mm bore × 670 mm outside diameter × 128 mm width (19.685 × 26.378 × 5.039 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3150 kN, static C0 6300 kN, fatigue limit Pu 430 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 125000 g."
      },
      {
        "q": "What does C 39/500 KM mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 500 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 39/500 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 39/500 KM sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-500-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 500×670×128 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/500 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-500-KM",
      "C 39/500 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-500-M",
    "brand": "SKF",
    "manufacturer_designation": "C 30/500 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 167,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4250,
    "static_load_kN": 8300,
    "fatigue_load_limit_kN": 560,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 225000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 30/500 M combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 500 mm bore, 720 mm outside diameter, 167 mm wide unit rated 4250 kN dynamic. SKF builds the CARB order number from size plus execution: the bare number C 30/500 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 500 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 167 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: slide the bearing onto the 500 mm seat or heat it (max 120 °C) and seat it square; never press through the 167 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (225 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "The quoted 4250/8300 kN ratings belong to this exact execution (C 30/500 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/500 M must float; the two are designed to be used as a pair.",
      "Never use C 30/500 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 4250/8300 kN ratings and 225000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 30/500 M have?",
        "a": "A C 30/500 M measures 500 mm bore × 720 mm outside diameter × 167 mm width (19.685 × 28.346 × 6.575 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4250 kN, static C0 8300 kN, fatigue limit Pu 560 kN, reference speed 630 r/min, limiting speed 900 r/min, mass about 225000 g."
      },
      {
        "q": "What does C 30/500 M mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 500 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 30/500 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 30/500 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-500-M",
      "C 30/500 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-500-M",
    "brand": "SKF",
    "manufacturer_designation": "C 31/500 M",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 500,
    "D_mm": 830,
    "B_mm": 264,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 7500,
    "static_load_kN": 12700,
    "fatigue_load_limit_kN": 850,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 560000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 31/500 M combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 500 mm bore, 830 mm outside diameter, 264 mm wide unit rated 7500 kN dynamic. The designation C 31/500 M separates into C (CARB), 31 (dimension series), 500 mm (slash-size) (500 mm bore — bore 500 mm is written directly after the slash) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 500×830×264 mm follows the ISO 15 plan. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 500 mm and larger sizes needing robust guidance under heavy load. The 560000 g mass over the 500×830×264 mm envelope yields about 15.00 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (560 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 530 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 7500/12700 kN ratings belong to this exact execution (C 31/500 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 31/500 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 500 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 7500/12700 kN ratings and 560000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 31/500 M?",
        "a": "A C 31/500 M measures 500 mm bore × 830 mm outside diameter × 264 mm width (19.685 × 32.677 × 10.394 in). From SKF catalogue PUB BU/P1 17000: dynamic C 7500 kN, static C0 12700 kN, fatigue limit Pu 850 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 560000 g."
      },
      {
        "q": "Can a CARB bearing like C 31/500 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 31/500 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 31/500 M designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 500 mm (slash-size) = 500 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (7500 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/500 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-500-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 500×830×264 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/500 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-500-M",
      "C 31/500 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-500-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 31/500 KM",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 500,
    "D_mm": 830,
    "B_mm": 264,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 7500,
    "static_load_kN": 12700,
    "fatigue_load_limit_kN": 850,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 560000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 31/500 KM denotes a toroidal roller bearing whose 264 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 31/500 KM the 31 dimension series fixes the 830 mm OD and 264 mm width around the 500 mm bore (the bore is written directly after the slash (no bore code)); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The KM suffix is a one-piece machined brass cage centred on the rollers, supplied for the 500 mm and larger sizes needing robust guidance under heavy load. Speed planning separates the 530 r/min thermal reference from the 750 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (560 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Reference and limiting speeds are different limits: the 530 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 7500/12700 kN ratings belong to this exact execution (C 31/500 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 31/500 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 500 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 7500/12700 kN ratings and 560000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 31/500 KM locate the shaft axially?",
        "a": "No — that is the defining feature. C 31/500 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 31/500 KM designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 500 mm (slash-size) = 500 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (7500 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/500 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage."
      },
      {
        "q": "How is C 31/500 KM mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-500-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 500×830×264 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/500 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-500-KM",
      "C 31/500 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C41-500-M",
    "brand": "SKF",
    "manufacturer_designation": "C 41/500 M",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 500,
    "D_mm": 830,
    "B_mm": 325,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9800,
    "static_load_kN": 17600,
    "fatigue_load_limit_kN": 1160,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 560,
    "max_rpm": 560,
    "weight_g": 710000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 41/500 M belongs to the CARB family — compact aligning roller bearings: envelope 500×830×325 mm, radial rating 9800/17600 kN C/C0, and no axial-locating function by design. SKF builds the CARB order number from size plus execution: the bare number C 41/500 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. The cylindrical 500 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 500×830×325 mm are identical — only the mounting method changes. Speed planning separates the 430 r/min thermal reference from the 560 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 500 mm seat or heat it (max 120 °C) and seat it square; never press through the 325 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (710 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 500 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 41/500 M must float; the two are designed to be used as a pair.",
      "Never use C 41/500 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 9800/17600 kN ratings and 710000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 41/500 M have?",
        "a": "A C 41/500 M measures 500 mm bore × 830 mm outside diameter × 325 mm width (19.685 × 32.677 × 12.795 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9800 kN, static C0 17600 kN, fatigue limit Pu 1160 kN, reference speed 430 r/min, limiting speed 560 r/min, mass about 710000 g."
      },
      {
        "q": "What does C 41/500 M mean in SKF part numbering?",
        "a": "C marks CARB; 41 the dimension series; the size code gives 500 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 41/500 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 41/500 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C41-500-K30M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 500×830×325 mm ISO 15 envelope and equivalent catalogue C/C0; C 41/500 K30M is the 1:30 tapered-bore K30 M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C41-500-M",
      "C 41/500 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C41-500-K30M",
    "brand": "SKF",
    "manufacturer_designation": "C 41/500 K30M",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 500,
    "D_mm": 830,
    "B_mm": 325,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9800,
    "static_load_kN": 17600,
    "fatigue_load_limit_kN": 1160,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 560,
    "max_rpm": 560,
    "weight_g": 710000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 41/500 K30M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 500×830×325 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 41/500 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here K30M. The K30M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 500 mm and larger sizes needing robust guidance under heavy load. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 41/500 K30M deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 325 mm wide cavity does not fill itself.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "Above 200 mm bore these bearings weigh tens of kilograms (710 kg here) — lifting gear and induction heating are mandatory, and a cocked ring scores the toroidal raceway before start-up.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 500 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 41/500 K30M must float; the two are designed to be used as a pair.",
      "The 9800/17600 kN ratings and 710000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 41/500 K30M mean in SKF part numbering?",
        "a": "C marks CARB; 41 the dimension series; the size code gives 500 mm bore; K30M is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 41/500 K30M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 41/500 K30M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C41-500-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 500×830×325 mm ISO 15 envelope and equivalent catalogue C/C0; C 41/500 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C41-500-K30M",
      "C 41/500 K30M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-530-M",
    "brand": "SKF",
    "manufacturer_designation": "C 30/530 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 530,
    "D_mm": 780,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 5100,
    "static_load_kN": 9500,
    "fatigue_load_limit_kN": 630,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 300000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 30/530 M: the toroidal rollers allow the 530 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (530 mm (slash-size)) encode the 530 mm bore; suffixes describe bore and execution. The cylindrical 530 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 530×780×185 mm are identical — only the mounting method changes. Speed planning separates the 600 r/min thermal reference from the 800 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 780 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 530 mm bore the 300 kg mass and 185 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 530 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/530 M must float; the two are designed to be used as a pair.",
      "Never use C 30/530 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 5100/9500 kN ratings and 300000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 30/530 M have?",
        "a": "A C 30/530 M measures 530 mm bore × 780 mm outside diameter × 185 mm width (20.866 × 30.709 × 7.283 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5100 kN, static C0 9500 kN, fatigue limit Pu 630 kN, reference speed 600 r/min, limiting speed 800 r/min, mass about 300000 g."
      },
      {
        "q": "What does C 30/530 M mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 530 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 30/530 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 30/530 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-530-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 530×780×185 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/530 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-530-M",
      "C 30/530 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-530-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 30/530 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 530,
    "D_mm": 780,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 5100,
    "static_load_kN": 9500,
    "fatigue_load_limit_kN": 630,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 300000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/530 KM is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 530×780×185 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (530 mm (slash-size)) encode the 530 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 530 mm seat. Selection arithmetic: C 5100 kN against C0 9500 kN gives a C0/C ratio of 1.86, and the 630 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 185 mm wide cavity does not fill itself.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 530 mm bore the 300 kg mass and 185 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/530 KM must float; the two are designed to be used as a pair.",
      "Never use C 30/530 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 530 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 5100/9500 kN ratings and 300000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 30/530 KM have?",
        "a": "A C 30/530 KM measures 530 mm bore × 780 mm outside diameter × 185 mm width (20.866 × 30.709 × 7.283 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5100 kN, static C0 9500 kN, fatigue limit Pu 630 kN, reference speed 600 r/min, limiting speed 800 r/min, mass about 300000 g."
      },
      {
        "q": "What does C 30/530 KM mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 530 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 30/530 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-530-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 530×780×185 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/530 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-530-KM",
      "C 30/530 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-530-M",
    "brand": "SKF",
    "manufacturer_designation": "C 31/530 M",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 530,
    "D_mm": 870,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 8800,
    "static_load_kN": 15600,
    "fatigue_load_limit_kN": 1020,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "weight_g": 636000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 31/530 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 530×870×272 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (530 mm (slash-size)) encode the 530 mm bore; suffixes describe bore and execution. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 530 mm and larger sizes needing robust guidance under heavy load. Speed planning separates the 500 r/min thermal reference from the 670 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 530 mm bore the 636 kg mass and 272 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 530 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 31/530 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 8800/15600 kN ratings belong to this exact execution (C 31/530 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 8800/15600 kN ratings and 636000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 31/530 M have?",
        "a": "A C 31/530 M measures 530 mm bore × 870 mm outside diameter × 272 mm width (20.866 × 34.252 × 10.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8800 kN, static C0 15600 kN, fatigue limit Pu 1020 kN, reference speed 500 r/min, limiting speed 670 r/min, mass about 636000 g."
      },
      {
        "q": "What does C 31/530 M mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 530 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 31/530 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 31/530 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-530-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 530×870×272 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/530 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-530-M",
      "C 31/530 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-530-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 31/530 KM",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 530,
    "D_mm": 870,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 8800,
    "static_load_kN": 15600,
    "fatigue_load_limit_kN": 1020,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "weight_g": 636000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 31/530 KM combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 530 mm bore, 870 mm outside diameter, 272 mm wide unit rated 8800 kN dynamic. The designation C 31/530 KM separates into C (CARB), 31 (dimension series), 530 mm (slash-size) (530 mm bore — bore 530 mm is written directly after the slash) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 530×870×272 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 530 mm shaft deflects; the 500 r/min reference and 670 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 31/530 KM deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 870 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 530 mm bore the 636 kg mass and 272 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/530 KM must float; the two are designed to be used as a pair.",
      "The quoted 8800/15600 kN ratings belong to this exact execution (C 31/530 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 31/530 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 8800/15600 kN ratings and 636000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 31/530 KM mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 31/530 KM?",
        "a": "A C 31/530 KM measures 530 mm bore × 870 mm outside diameter × 272 mm width (20.866 × 34.252 × 10.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8800 kN, static C0 15600 kN, fatigue limit Pu 1020 kN, reference speed 500 r/min, limiting speed 670 r/min, mass about 636000 g."
      },
      {
        "q": "Can a CARB bearing like C 31/530 KM locate the shaft axially?",
        "a": "No — that is the defining feature. C 31/530 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 31/530 KM designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 530 mm (slash-size) = 530 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-530-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 530×870×272 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/530 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-530-KM",
      "C 31/530 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-560-M",
    "brand": "SKF",
    "manufacturer_designation": "C 39/560 M",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 560,
    "D_mm": 750,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3600,
    "static_load_kN": 7350,
    "fatigue_load_limit_kN": 490,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 175000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 39/560 M belongs to the CARB family — compact aligning roller bearings: envelope 560×750×140 mm, radial rating 3600/7350 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (560 mm (slash-size)) encode the 560 mm bore; suffixes describe bore and execution. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 560 mm and larger sizes needing robust guidance under heavy load. The 175000 g mass over the 560×750×140 mm envelope yields about 6.43 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 750 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 560 mm bore the 175 kg mass and 140 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/560 M must float; the two are designed to be used as a pair.",
      "Never use C 39/560 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 560 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 3600/7350 kN ratings and 175000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 39/560 M have?",
        "a": "A C 39/560 M measures 560 mm bore × 750 mm outside diameter × 140 mm width (22.047 × 29.528 × 5.512 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3600 kN, static C0 7350 kN, fatigue limit Pu 490 kN, reference speed 600 r/min, limiting speed 850 r/min, mass about 175000 g."
      },
      {
        "q": "What does C 39/560 M mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 560 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 39/560 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-560-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 560×750×140 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/560 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-560-M",
      "C 39/560 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-560-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 39/560 KM",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 560,
    "D_mm": 750,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3600,
    "static_load_kN": 7350,
    "fatigue_load_limit_kN": 490,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 175000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 39/560 KM is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 560×750×140 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (560 mm (slash-size)) encode the 560 mm bore; suffixes describe bore and execution. The K suffix gives a 1:12 tapered 560 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 560×750×140 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 140 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 140 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 560 mm bore the 175 kg mass and 140 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/560 KM must float; the two are designed to be used as a pair.",
      "Never use C 39/560 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Reference and limiting speeds are different limits: the 600 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 3600/7350 kN ratings belong to this exact execution (C 39/560 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 3600/7350 kN ratings and 175000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 39/560 KM have?",
        "a": "A C 39/560 KM measures 560 mm bore × 750 mm outside diameter × 140 mm width (22.047 × 29.528 × 5.512 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3600 kN, static C0 7350 kN, fatigue limit Pu 490 kN, reference speed 600 r/min, limiting speed 850 r/min, mass about 175000 g."
      },
      {
        "q": "What does C 39/560 KM mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 560 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 39/560 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 39/560 KM sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-560-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 560×750×140 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/560 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-560-KM",
      "C 39/560 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-560-M",
    "brand": "SKF",
    "manufacturer_designation": "C 30/560 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 560,
    "D_mm": 820,
    "B_mm": 195,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 5600,
    "static_load_kN": 11000,
    "fatigue_load_limit_kN": 720,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 350000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 30/560 M denotes a toroidal roller bearing whose 195 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 30/560 M the 30 dimension series fixes the 820 mm OD and 195 mm width around the 560 mm bore (the bore is written directly after the slash (no bore code)); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 560 mm and larger sizes needing robust guidance under heavy load. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 30/560 M deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 560 mm bore the 350 kg mass and 195 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Never use C 30/560 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 560 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/560 M must float; the two are designed to be used as a pair.",
      "The 5600/11000 kN ratings and 350000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 30/560 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 560 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 195 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 30/560 M?",
        "a": "A C 30/560 M measures 560 mm bore × 820 mm outside diameter × 195 mm width (22.047 × 32.283 × 7.677 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5600 kN, static C0 11000 kN, fatigue limit Pu 720 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 350000 g."
      },
      {
        "q": "Can a CARB bearing like C 30/560 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 30/560 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 30/560 M designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 560 mm (slash-size) = 560 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-560-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 560×820×195 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/560 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-560-M",
      "C 30/560 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-560-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 30/560 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 560,
    "D_mm": 820,
    "B_mm": 195,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 5600,
    "static_load_kN": 11000,
    "fatigue_load_limit_kN": 720,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 350000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/560 KM is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 560 mm bore, 820 mm OD, 195 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 30/560 KM separates into C (CARB), 30 (dimension series), 560 mm (slash-size) (560 mm bore — bore 560 mm is written directly after the slash) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 560×820×195 mm follows the ISO 15 plan. The K suffix gives a 1:12 tapered 560 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 560×820×195 mm are identical — only the mounting method changes. The 350000 g mass over the 560×820×195 mm envelope yields about 10.00 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 195 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 560 mm bore the 350 kg mass and 195 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Never use C 30/560 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 560 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 530 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 5600/11000 kN ratings belong to this exact execution (C 30/560 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 5600/11000 kN ratings and 350000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the C 30/560 KM designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 560 mm (slash-size) = 560 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (5600 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/560 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage."
      },
      {
        "q": "How is C 30/560 KM mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 30/560 KM?",
        "a": "A C 30/560 KM measures 560 mm bore × 820 mm outside diameter × 195 mm width (22.047 × 32.283 × 7.677 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5600 kN, static C0 11000 kN, fatigue limit Pu 720 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 350000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-560-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 560×820×195 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/560 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-560-KM",
      "C 30/560 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C41-560-K30MB",
    "brand": "SKF",
    "manufacturer_designation": "C 41/560 K30MB",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 560,
    "D_mm": 920,
    "B_mm": 355,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 10400,
    "static_load_kN": 19600,
    "fatigue_load_limit_kN": 1270,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 500,
    "max_rpm": 500,
    "weight_g": 989000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 41/560 K30MB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 560×920×355 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 41/560 K30MB the 41 dimension series fixes the 920 mm OD and 355 mm width around the 560 mm bore (the bore is written directly after the slash (no bore code)); the suffix K30MB then selects the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB). The K30MB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 355 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: mount on the withdrawal (AH) sleeve matched to the 1:30 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 355 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 560 mm bore the 989 kg mass and 355 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Never use C 41/560 K30MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 560 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 380 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 10400/19600 kN ratings belong to this exact execution (C 41/560 K30MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 10400/19600 kN ratings and 989000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 41/560 K30MB?",
        "a": "A C 41/560 K30MB measures 560 mm bore × 920 mm outside diameter × 355 mm width (22.047 × 36.22 × 13.976 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10400 kN, static C0 19600 kN, fatigue limit Pu 1270 kN, reference speed 380 r/min, limiting speed 500 r/min, mass about 989000 g."
      },
      {
        "q": "Can a CARB bearing like C 41/560 K30MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 41/560 K30MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 41/560 K30MB designation read?",
        "a": "C = CARB toroidal family; 41 = dimension series; 560 mm (slash-size) = 560 mm bore (the bore is written directly after the slash (no bore code)); suffix K30MB selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (10400 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 41/560 K30MB is the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C41",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C41-560-K30MB",
      "C 41/560 K30MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-600-M",
    "brand": "SKF",
    "manufacturer_designation": "C 30/600 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 600,
    "D_mm": 870,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6300,
    "static_load_kN": 12200,
    "fatigue_load_limit_kN": 780,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "weight_g": 395000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/600 M belongs to the CARB family — compact aligning roller bearings: envelope 600×870×200 mm, radial rating 6300/12200 kN C/C0, and no axial-locating function by design. In C 30/600 M the 30 dimension series fixes the 870 mm OD and 200 mm width around the 600 mm bore (the bore is written directly after the slash (no bore code)); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The cylindrical 600 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 600×870×200 mm are identical — only the mounting method changes. Speed planning separates the 500 r/min thermal reference from the 700 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 200 mm wide cavity does not fill itself.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 600 mm bore the 395 kg mass and 200 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Reference and limiting speeds are different limits: the 500 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 6300/12200 kN ratings belong to this exact execution (C 30/600 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/600 M must float; the two are designed to be used as a pair.",
      "The 6300/12200 kN ratings and 395000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 30/600 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 30/600 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 30/600 M designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 600 mm (slash-size) = 600 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (6300 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/600 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      },
      {
        "q": "How is C 30/600 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 600 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 200 mm roller set."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-600-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 600×870×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/600 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-600-M",
      "C 30/600 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-600-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 30/600 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 600,
    "D_mm": 870,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6300,
    "static_load_kN": 12200,
    "fatigue_load_limit_kN": 780,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "weight_g": 395000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/600 KM is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 600×870×200 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. SKF builds the CARB order number from size plus execution: the bare number C 30/600 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. The K suffix gives a 1:12 tapered 600 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 600×870×200 mm are identical — only the mounting method changes. Selection arithmetic: C 6300 kN against C0 12200 kN gives a C0/C ratio of 1.94, and the 780 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the adapter (H) sleeve matched to the 1:12 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 200 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 600 mm bore the 395 kg mass and 200 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/600 KM must float; the two are designed to be used as a pair.",
      "Never use C 30/600 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 6300/12200 kN ratings belong to this exact execution (C 30/600 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 6300/12200 kN ratings and 395000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 30/600 KM have?",
        "a": "A C 30/600 KM measures 600 mm bore × 870 mm outside diameter × 200 mm width (23.622 × 34.252 × 7.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6300 kN, static C0 12200 kN, fatigue limit Pu 780 kN, reference speed 500 r/min, limiting speed 700 r/min, mass about 395000 g."
      },
      {
        "q": "What does C 30/600 KM mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 600 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 30/600 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-600-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 600×870×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/600 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-600-KM",
      "C 30/600 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-600-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 31/600 MB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 600,
    "D_mm": 980,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 10200,
    "static_load_kN": 18000,
    "fatigue_load_limit_kN": 1140,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 600,
    "max_rpm": 600,
    "weight_g": 929000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 31/600 MB is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 600 mm bore, 980 mm OD, 300 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 31/600 MB separates into C (CARB), 31 (dimension series), 600 mm (slash-size) (600 mm bore — bore 600 mm is written directly after the slash) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 600×980×300 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 600 mm shaft deflects; the 430 r/min reference and 600 r/min limiting speed are both catalogue values. Speed planning separates the 430 r/min thermal reference from the 600 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Mounting: slide the bearing onto the 600 mm seat or heat it (max 120 °C) and seat it square; never press through the 300 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 600 mm bore the 929 kg mass and 300 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Never use C 31/600 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 600 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 10200/18000 kN ratings belong to this exact execution (C 31/600 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 10200/18000 kN ratings and 929000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 31/600 MB mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 600 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 300 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 31/600 MB?",
        "a": "A C 31/600 MB measures 600 mm bore × 980 mm outside diameter × 300 mm width (23.622 × 38.583 × 11.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10200 kN, static C0 18000 kN, fatigue limit Pu 1140 kN, reference speed 430 r/min, limiting speed 600 r/min, mass about 929000 g."
      },
      {
        "q": "Can a CARB bearing like C 31/600 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 31/600 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 31/600 MB designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 600 mm (slash-size) = 600 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-600-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 600×980×300 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/600 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-600-MB",
      "C 31/600 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-600-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 31/600 KMB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 600,
    "D_mm": 980,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 10200,
    "static_load_kN": 18000,
    "fatigue_load_limit_kN": 1140,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 600,
    "max_rpm": 600,
    "weight_g": 929000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 31/600 KMB denotes a toroidal roller bearing whose 300 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 31/600 KMB the 31 dimension series fixes the 980 mm OD and 300 mm width around the 600 mm bore (the bore is written directly after the slash (no bore code)); the suffix KMB then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 600 mm shaft deflects; the 430 r/min reference and 600 r/min limiting speed are both catalogue values. The 929000 g mass over the 600×980×300 mm envelope yields about 17.00 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 600 mm bore the 929 kg mass and 300 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/600 KMB must float; the two are designed to be used as a pair.",
      "Never use C 31/600 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 600 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 10200/18000 kN ratings and 929000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 31/600 KMB mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 31/600 KMB?",
        "a": "A C 31/600 KMB measures 600 mm bore × 980 mm outside diameter × 300 mm width (23.622 × 38.583 × 11.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10200 kN, static C0 18000 kN, fatigue limit Pu 1140 kN, reference speed 430 r/min, limiting speed 600 r/min, mass about 929000 g."
      },
      {
        "q": "Can a CARB bearing like C 31/600 KMB locate the shaft axially?",
        "a": "No — that is the defining feature. C 31/600 KMB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 31/600 KMB designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 600 mm (slash-size) = 600 mm bore (the bore is written directly after the slash (no bore code)); suffix KMB selects tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-600-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 600×980×300 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/600 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-600-KMB",
      "C 31/600 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C41-600-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 41/600 MB",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 600,
    "D_mm": 980,
    "B_mm": 375,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 12900,
    "static_load_kN": 23200,
    "fatigue_load_limit_kN": 1460,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "weight_g": 1150000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 41/600 MB is the dimension series 41 CARB toroidal roller bearings member of the CARB range: 600 mm bore, 980 mm OD, 375 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 41/600 MB separates into C (CARB), 41 (dimension series), 600 mm (slash-size) (600 mm bore — bore 600 mm is written directly after the slash) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 600×980×375 mm follows the ISO 15 plan. The cylindrical 600 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 600×980×375 mm are identical — only the mounting method changes. The 1150000 g mass over the 600×980×375 mm envelope yields about 21.50 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 375 mm wide cavity does not fill itself.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 600 mm bore the 1150 kg mass and 375 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Reference and limiting speeds are different limits: the 340 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 12900/23200 kN ratings belong to this exact execution (C 41/600 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 41/600 MB must float; the two are designed to be used as a pair.",
      "The 12900/23200 kN ratings and 1150000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 41/600 MB mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 600 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 375 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 41/600 MB?",
        "a": "A C 41/600 MB measures 600 mm bore × 980 mm outside diameter × 375 mm width (23.622 × 38.583 × 14.764 in). From SKF catalogue PUB BU/P1 17000: dynamic C 12900 kN, static C0 23200 kN, fatigue limit Pu 1460 kN, reference speed 340 r/min, limiting speed 450 r/min, mass about 1150000 g."
      },
      {
        "q": "Can a CARB bearing like C 41/600 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 41/600 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 41/600 MB designation read?",
        "a": "C = CARB toroidal family; 41 = dimension series; 600 mm (slash-size) = 600 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C41-600-K30MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 600×980×375 mm ISO 15 envelope and equivalent catalogue C/C0; C 41/600 K30MB is the 1:30 tapered-bore K30 MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C41-600-MB",
      "C 41/600 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C41-600-K30MB",
    "brand": "SKF",
    "manufacturer_designation": "C 41/600 K30MB",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 600,
    "D_mm": 980,
    "B_mm": 375,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 12900,
    "static_load_kN": 23200,
    "fatigue_load_limit_kN": 1460,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "weight_g": 1150000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 41/600 K30MB denotes a toroidal roller bearing whose 375 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. Reading the code: C marks the CARB toroidal family, the first two digits (41) identify the ISO dimension series and the last two (600 mm (slash-size)) encode the 600 mm bore; suffixes describe bore and execution. The K30 suffix gives a 1:30 tapered 600 mm bore, mounted on a withdrawal (AH) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 600×980×375 mm are identical — only the mounting method changes. Selection arithmetic: C 12900 kN against C0 23200 kN gives a C0/C ratio of 1.80, and the 1460 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 980 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 600 mm bore the 1150 kg mass and 375 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 600 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 340 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 41/600 K30MB must float; the two are designed to be used as a pair.",
      "Never use C 41/600 K30MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 12900/23200 kN ratings and 1150000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 41/600 K30MB mean in SKF part numbering?",
        "a": "C marks CARB; 41 the dimension series; the size code gives 600 mm bore; K30MB is the execution (tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 41/600 K30MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 41/600 K30MB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C41-600-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 600×980×375 mm ISO 15 envelope and equivalent catalogue C/C0; C 41/600 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C41-600-K30MB",
      "C 41/600 K30MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-630-M",
    "brand": "SKF",
    "manufacturer_designation": "C 39/630 M",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 630,
    "D_mm": 850,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4650,
    "static_load_kN": 10000,
    "fatigue_load_limit_kN": 640,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "weight_g": 275000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists C 39/630 M in the dimension series 39 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 39/630 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 630 mm seat. The 275000 g mass over the 630×850×165 mm envelope yields about 7.38 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 850 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 630 mm bore the 275 kg mass and 165 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/630 M must float; the two are designed to be used as a pair.",
      "Never use C 39/630 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 630 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 530 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 4650/10000 kN ratings and 275000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 39/630 M mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 630 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 39/630 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 39/630 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-630-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 630×850×165 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/630 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-630-M",
      "C 39/630 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-630-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 39/630 KM",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 630,
    "D_mm": 850,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4650,
    "static_load_kN": 10000,
    "fatigue_load_limit_kN": 640,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "weight_g": 275000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 39/630 KM: the toroidal rollers allow the 630 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 39/630 KM the 39 dimension series fixes the 850 mm OD and 165 mm width around the 630 mm bore (the bore is written directly after the slash (no bore code)); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The K suffix gives a 1:12 tapered 630 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 630×850×165 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 39/630 KM deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 850 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 630 mm bore the 275 kg mass and 165 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Never use C 39/630 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 630 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 530 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 4650/10000 kN ratings belong to this exact execution (C 39/630 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 4650/10000 kN ratings and 275000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 39/630 KM?",
        "a": "A C 39/630 KM measures 630 mm bore × 850 mm outside diameter × 165 mm width (24.803 × 33.465 × 6.496 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4650 kN, static C0 10000 kN, fatigue limit Pu 640 kN, reference speed 530 r/min, limiting speed 700 r/min, mass about 275000 g."
      },
      {
        "q": "Can a CARB bearing like C 39/630 KM locate the shaft axially?",
        "a": "No — that is the defining feature. C 39/630 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 39/630 KM designation read?",
        "a": "C = CARB toroidal family; 39 = dimension series; 630 mm (slash-size) = 630 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (4650 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 39/630 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-630-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 630×850×165 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/630 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-630-KM",
      "C 39/630 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-630-M",
    "brand": "SKF",
    "manufacturer_designation": "C 30/630 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 630,
    "D_mm": 920,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6800,
    "static_load_kN": 12900,
    "fatigue_load_limit_kN": 815,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "weight_g": 470000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/630 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 630×920×212 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 30/630 M separates into C (CARB), 30 (dimension series), 630 mm (slash-size) (630 mm bore — bore 630 mm is written directly after the slash) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 630×920×212 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 630 mm seat. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 30/630 M deliberately carries none. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 630 mm bore the 470 kg mass and 212 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Never use C 30/630 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 630 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/630 M must float; the two are designed to be used as a pair.",
      "The 6800/12900 kN ratings and 470000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 30/630 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 30/630 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 30/630 M designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 630 mm (slash-size) = 630 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (6800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/630 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      },
      {
        "q": "How is C 30/630 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 630 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 212 mm roller set."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-630-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 630×920×212 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/630 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-630-M",
      "C 30/630 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-630-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 30/630 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 630,
    "D_mm": 920,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6800,
    "static_load_kN": 12900,
    "fatigue_load_limit_kN": 815,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "weight_g": 470000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/630 KM belongs to the CARB family — compact aligning roller bearings: envelope 630×920×212 mm, radial rating 6800/12900 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (630 mm (slash-size)) encode the 630 mm bore; suffixes describe bore and execution. The K suffix gives a 1:12 tapered 630 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 630×920×212 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 212 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 212 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 630 mm bore the 470 kg mass and 212 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 630 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 480 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 30/630 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 6800/12900 kN ratings belong to this exact execution (C 30/630 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 6800/12900 kN ratings and 470000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is C 30/630 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 30/630 KM sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 30/630 KM have?",
        "a": "A C 30/630 KM measures 630 mm bore × 920 mm outside diameter × 212 mm width (24.803 × 36.22 × 8.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6800 kN, static C0 12900 kN, fatigue limit Pu 815 kN, reference speed 480 r/min, limiting speed 670 r/min, mass about 470000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-630-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 630×920×212 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/630 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-630-KM",
      "C 30/630 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-630-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 31/630 MB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 630,
    "D_mm": 1030,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 11800,
    "static_load_kN": 20800,
    "fatigue_load_limit_kN": 1290,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 560,
    "max_rpm": 560,
    "weight_g": 1090000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 31/630 MB: the toroidal rollers allow the 630 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 31/630 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here MB. The cylindrical 630 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 630×1030×315 mm are identical — only the mounting method changes. The 1090000 g mass over the 630×1030×315 mm envelope yields about 18.73 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Mounting: slide the bearing onto the 630 mm seat or heat it (max 120 °C) and seat it square; never press through the 315 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 630 mm bore the 1090 kg mass and 315 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 630 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 11800/20800 kN ratings belong to this exact execution (C 31/630 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 11800/20800 kN ratings and 1090000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 31/630 MB mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 630 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 31/630 MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 31/630 MB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-630-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 630×1030×315 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/630 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-630-MB",
      "C 31/630 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-630-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 31/630 KMB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 630,
    "D_mm": 1030,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 11800,
    "static_load_kN": 20800,
    "fatigue_load_limit_kN": 1290,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 560,
    "max_rpm": 560,
    "weight_g": 1090000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists C 31/630 KMB in the dimension series 31 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (630 mm (slash-size)) encode the 630 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 630 mm seat. Selection arithmetic: C 11800 kN against C0 20800 kN gives a C0/C ratio of 1.76, and the 1290 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 315 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 630 mm bore the 1090 kg mass and 315 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/630 KMB must float; the two are designed to be used as a pair.",
      "Never use C 31/630 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Reference and limiting speeds are different limits: the 400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 11800/20800 kN ratings belong to this exact execution (C 31/630 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 11800/20800 kN ratings and 1090000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 866); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 31/630 KMB mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 630 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 31/630 KMB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 31/630 KMB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-630-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 630×1030×315 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/630 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-630-KMB",
      "C 31/630 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-670-M",
    "brand": "SKF",
    "manufacturer_designation": "C 30/670 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 670,
    "D_mm": 980,
    "B_mm": 230,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 8150,
    "static_load_kN": 16300,
    "fatigue_load_limit_kN": 1000,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 600,
    "max_rpm": 600,
    "weight_g": 590000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 30/670 M: the toroidal rollers allow the 670 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 30/670 M the 30 dimension series fixes the 980 mm OD and 230 mm width around the 670 mm bore (the bore is written directly after the slash (no bore code)); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 670 mm seat. Speed planning separates the 430 r/min thermal reference from the 600 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 980 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 670 mm bore the 590 kg mass and 230 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Never use C 30/670 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 670 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 8150/16300 kN ratings belong to this exact execution (C 30/670 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 8150/16300 kN ratings and 590000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 30/670 M?",
        "a": "A C 30/670 M measures 670 mm bore × 980 mm outside diameter × 230 mm width (26.378 × 38.583 × 9.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8150 kN, static C0 16300 kN, fatigue limit Pu 1000 kN, reference speed 430 r/min, limiting speed 600 r/min, mass about 590000 g."
      },
      {
        "q": "Can a CARB bearing like C 30/670 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 30/670 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 30/670 M designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 670 mm (slash-size) = 670 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (8150 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/670 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-670-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 670×980×230 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/670 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-670-M",
      "C 30/670 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-670-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 30/670 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 670,
    "D_mm": 980,
    "B_mm": 230,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 8150,
    "static_load_kN": 16300,
    "fatigue_load_limit_kN": 1000,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 600,
    "max_rpm": 600,
    "weight_g": 590000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 30/670 KM: the toroidal rollers allow the 670 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. In C 30/670 KM the 30 dimension series fixes the 980 mm OD and 230 mm width around the 670 mm bore (the bore is written directly after the slash (no bore code)); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The KM suffix is a one-piece machined brass cage centred on the rollers, supplied for the 670 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 230 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 980 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 670 mm bore the 590 kg mass and 230 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 8150/16300 kN ratings belong to this exact execution (C 30/670 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 670 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Never use C 30/670 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 8150/16300 kN ratings and 590000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 30/670 KM?",
        "a": "A C 30/670 KM measures 670 mm bore × 980 mm outside diameter × 230 mm width (26.378 × 38.583 × 9.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8150 kN, static C0 16300 kN, fatigue limit Pu 1000 kN, reference speed 430 r/min, limiting speed 600 r/min, mass about 590000 g."
      },
      {
        "q": "Can a CARB bearing like C 30/670 KM locate the shaft axially?",
        "a": "No — that is the defining feature. C 30/670 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 30/670 KM designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 670 mm (slash-size) = 670 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (8150 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/670 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-670-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 670×980×230 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/670 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-670-KM",
      "C 30/670 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-670-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 31/670 MB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 670,
    "D_mm": 1090,
    "B_mm": 336,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 11800,
    "static_load_kN": 21200,
    "fatigue_load_limit_kN": 1290,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 500,
    "max_rpm": 500,
    "weight_g": 1300000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 31/670 MB belongs to the CARB family — compact aligning roller bearings: envelope 670×1090×336 mm, radial rating 11800/21200 kN C/C0, and no axial-locating function by design. The designation C 31/670 MB separates into C (CARB), 31 (dimension series), 670 mm (slash-size) (670 mm bore — bore 670 mm is written directly after the slash) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 670×1090×336 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 670 mm seat. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 336 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1090 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 670 mm bore the 1300 kg mass and 336 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Reference and limiting speeds are different limits: the 380 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 11800/21200 kN ratings belong to this exact execution (C 31/670 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/670 MB must float; the two are designed to be used as a pair.",
      "Never use C 31/670 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 11800/21200 kN ratings and 1300000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 31/670 MB?",
        "a": "A C 31/670 MB measures 670 mm bore × 1090 mm outside diameter × 336 mm width (26.378 × 42.913 × 13.228 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11800 kN, static C0 21200 kN, fatigue limit Pu 1290 kN, reference speed 380 r/min, limiting speed 500 r/min, mass about 1300000 g."
      },
      {
        "q": "Can a CARB bearing like C 31/670 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 31/670 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 31/670 MB designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 670 mm (slash-size) = 670 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (11800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/670 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-670-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 670×1090×336 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/670 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-670-MB",
      "C 31/670 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-670-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 31/670 KMB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 670,
    "D_mm": 1090,
    "B_mm": 336,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 11800,
    "static_load_kN": 21200,
    "fatigue_load_limit_kN": 1290,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 500,
    "max_rpm": 500,
    "weight_g": 1300000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 31/670 KMB: the toroidal rollers allow the 670 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 31/670 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KMB. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 670 mm seat. Speed planning separates the 380 r/min thermal reference from the 500 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1090 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 670 mm bore the 1300 kg mass and 336 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "The quoted 11800/21200 kN ratings belong to this exact execution (C 31/670 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 670 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 380 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 11800/21200 kN ratings and 1300000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 31/670 KMB have?",
        "a": "A C 31/670 KMB measures 670 mm bore × 1090 mm outside diameter × 336 mm width (26.378 × 42.913 × 13.228 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11800 kN, static C0 21200 kN, fatigue limit Pu 1290 kN, reference speed 380 r/min, limiting speed 500 r/min, mass about 1300000 g."
      },
      {
        "q": "What does C 31/670 KMB mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 670 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 31/670 KMB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 31/670 KMB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-670-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 670×1090×336 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/670 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-670-KMB",
      "C 31/670 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C41-670-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 41/670 MB",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 670,
    "D_mm": 1090,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 16000,
    "static_load_kN": 29000,
    "fatigue_load_limit_kN": 1760,
    "reference_speed_rpm": 300,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "weight_g": 1570000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 41/670 MB is the dimension series 41 CARB toroidal roller bearings member of the CARB range: 670 mm bore, 1090 mm OD, 412 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. The designation C 41/670 MB separates into C (CARB), 41 (dimension series), 670 mm (slash-size) (670 mm bore — bore 670 mm is written directly after the slash) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 670×1090×412 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 670 mm shaft deflects; the 300 r/min reference and 400 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 41/670 MB deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 412 mm wide cavity does not fill itself.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 670 mm bore the 1570 kg mass and 412 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 41/670 MB must float; the two are designed to be used as a pair.",
      "Reference and limiting speeds are different limits: the 300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 16000/29000 kN ratings belong to this exact execution (C 41/670 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 16000/29000 kN ratings and 1570000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 41/670 MB?",
        "a": "A C 41/670 MB measures 670 mm bore × 1090 mm outside diameter × 412 mm width (26.378 × 42.913 × 16.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 16000 kN, static C0 29000 kN, fatigue limit Pu 1760 kN, reference speed 300 r/min, limiting speed 400 r/min, mass about 1570000 g."
      },
      {
        "q": "Can a CARB bearing like C 41/670 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 41/670 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 41/670 MB designation read?",
        "a": "C = CARB toroidal family; 41 = dimension series; 670 mm (slash-size) = 670 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (16000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 41/670 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C41-670-K30MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 670×1090×412 mm ISO 15 envelope and equivalent catalogue C/C0; C 41/670 K30MB is the 1:30 tapered-bore K30 MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C41-670-MB",
      "C 41/670 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C41-670-K30MB",
    "brand": "SKF",
    "manufacturer_designation": "C 41/670 K30MB",
    "series": "C4100-series",
    "type": "carb_toroidal",
    "d_mm": 670,
    "D_mm": 1090,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 16000,
    "static_load_kN": 29000,
    "fatigue_load_limit_kN": 1760,
    "reference_speed_rpm": 300,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "weight_g": 1570000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 41/670 K30MB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 670 mm bore, 1090 mm outside diameter, 412 mm wide unit rated 16000 kN dynamic. The designation C 41/670 K30MB separates into C (CARB), 41 (dimension series), 670 mm (slash-size) (670 mm bore — bore 670 mm is written directly after the slash) and K30MB (tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)); envelope 670×1090×412 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 670 mm shaft deflects; the 300 r/min reference and 400 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 41/670 K30MB deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1090 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 670 mm bore the 1570 kg mass and 412 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Reference and limiting speeds are different limits: the 300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 16000/29000 kN ratings belong to this exact execution (C 41/670 K30MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Never use C 41/670 K30MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 16000/29000 kN ratings and 1570000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the C 41/670 K30MB?",
        "a": "A C 41/670 K30MB measures 670 mm bore × 1090 mm outside diameter × 412 mm width (26.378 × 42.913 × 16.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 16000 kN, static C0 29000 kN, fatigue limit Pu 1760 kN, reference speed 300 r/min, limiting speed 400 r/min, mass about 1570000 g."
      },
      {
        "q": "Can a CARB bearing like C 41/670 K30MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 41/670 K30MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 41/670 K30MB designation read?",
        "a": "C = CARB toroidal family; 41 = dimension series; 670 mm (slash-size) = 670 mm bore (the bore is written directly after the slash (no bore code)); suffix K30MB selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (16000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 41/670 K30MB is the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined inner-ring-guided brass cage (MB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C41-670-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 670×1090×412 mm ISO 15 envelope and equivalent catalogue C/C0; C 41/670 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C41-670-K30MB",
      "C 41/670 K30MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-710-M",
    "brand": "SKF",
    "manufacturer_designation": "C 39/710 M",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 710,
    "D_mm": 950,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6000,
    "static_load_kN": 12500,
    "fatigue_load_limit_kN": 780,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 630,
    "max_rpm": 630,
    "weight_g": 360000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 39/710 M: the toroidal rollers allow the 710 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (710 mm (slash-size)) encode the 710 mm bore; suffixes describe bore and execution. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 710 mm and larger sizes needing robust guidance under heavy load. Speed planning separates the 450 r/min thermal reference from the 630 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 180 mm wide cavity does not fill itself.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 710 mm bore the 360 kg mass and 180 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 450 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/710 M must float; the two are designed to be used as a pair.",
      "The 6000/12500 kN ratings and 360000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is C 39/710 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 39/710 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 39/710 M have?",
        "a": "A C 39/710 M measures 710 mm bore × 950 mm outside diameter × 180 mm width (27.953 × 37.402 × 7.087 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6000 kN, static C0 12500 kN, fatigue limit Pu 780 kN, reference speed 450 r/min, limiting speed 630 r/min, mass about 360000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-710-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 710×950×180 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/710 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-710-M",
      "C 39/710 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-710-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 39/710 KM",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 710,
    "D_mm": 950,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6000,
    "static_load_kN": 12500,
    "fatigue_load_limit_kN": 780,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 630,
    "max_rpm": 630,
    "weight_g": 360000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 39/710 KM: the toroidal rollers allow the 710 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 39/710 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here KM. The K suffix gives a 1:12 tapered 710 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 710×950×180 mm are identical — only the mounting method changes. Speed planning separates the 450 r/min thermal reference from the 630 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 180 mm wide cavity does not fill itself.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 710 mm bore the 360 kg mass and 180 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/710 KM must float; the two are designed to be used as a pair.",
      "Never use C 39/710 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 6000/12500 kN ratings and 360000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 39/710 KM have?",
        "a": "A C 39/710 KM measures 710 mm bore × 950 mm outside diameter × 180 mm width (27.953 × 37.402 × 7.087 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6000 kN, static C0 12500 kN, fatigue limit Pu 780 kN, reference speed 450 r/min, limiting speed 630 r/min, mass about 360000 g."
      },
      {
        "q": "What does C 39/710 KM mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 710 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 39/710 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 39/710 KM sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-710-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 710×950×180 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/710 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-710-KM",
      "C 39/710 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-710-M",
    "brand": "SKF",
    "manufacturer_designation": "C 30/710 M",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 710,
    "D_mm": 1030,
    "B_mm": 236,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 8800,
    "static_load_kN": 17300,
    "fatigue_load_limit_kN": 1060,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 560,
    "max_rpm": 560,
    "weight_g": 655000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/710 M belongs to the CARB family — compact aligning roller bearings: envelope 710×1030×236 mm, radial rating 8800/17300 kN C/C0, and no axial-locating function by design. In C 30/710 M the 30 dimension series fixes the 1030 mm OD and 236 mm width around the 710 mm bore (the bore is written directly after the slash (no bore code)); the suffix M then selects the cylindrical bore for direct shaft fitting, machined brass M cage. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 710 mm and larger sizes needing robust guidance under heavy load. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 236 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1030 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 710 mm bore the 655 kg mass and 236 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Reference and limiting speeds are different limits: the 400 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 8800/17300 kN ratings belong to this exact execution (C 30/710 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Never use C 30/710 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 8800/17300 kN ratings and 655000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the C 30/710 M designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 710 mm (slash-size) = 710 mm bore (the bore is written directly after the slash (no bore code)); suffix M selects cylindrical bore for direct shaft fitting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (8800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/710 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      },
      {
        "q": "How is C 30/710 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 710 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 236 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 30/710 M?",
        "a": "A C 30/710 M measures 710 mm bore × 1030 mm outside diameter × 236 mm width (27.953 × 40.551 × 9.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8800 kN, static C0 17300 kN, fatigue limit Pu 1060 kN, reference speed 400 r/min, limiting speed 560 r/min, mass about 655000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-710-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 710×1030×236 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/710 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-710-M",
      "C 30/710 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-710-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 30/710 KM",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 710,
    "D_mm": 1030,
    "B_mm": 236,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 8800,
    "static_load_kN": 17300,
    "fatigue_load_limit_kN": 1060,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 560,
    "max_rpm": 560,
    "weight_g": 655000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/710 KM is the dimension series 30 CARB toroidal roller bearings member of the CARB range: 710 mm bore, 1030 mm OD, 236 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. In C 30/710 KM the 30 dimension series fixes the 1030 mm OD and 236 mm width around the 710 mm bore (the bore is written directly after the slash (no bore code)); the suffix KM then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. The KM suffix is a one-piece machined brass cage centred on the rollers, supplied for the 710 mm and larger sizes needing robust guidance under heavy load. Selection arithmetic: C 8800 kN against C0 17300 kN gives a C0/C ratio of 1.97, and the 1060 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1030 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 710 mm bore the 655 kg mass and 236 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Never use C 30/710 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The quoted 8800/17300 kN ratings belong to this exact execution (C 30/710 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 8800/17300 kN ratings and 655000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the C 30/710 KM designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 710 mm (slash-size) = 710 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (8800 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/710 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage."
      },
      {
        "q": "How is C 30/710 KM mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 30/710 KM?",
        "a": "A C 30/710 KM measures 710 mm bore × 1030 mm outside diameter × 236 mm width (27.953 × 40.551 × 9.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8800 kN, static C0 17300 kN, fatigue limit Pu 1060 kN, reference speed 400 r/min, limiting speed 560 r/min, mass about 655000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-710-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 710×1030×236 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/710 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-710-KM",
      "C 30/710 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C40-710-M",
    "brand": "SKF",
    "manufacturer_designation": "C 40/710 M",
    "series": "C4000-series",
    "type": "carb_toroidal",
    "d_mm": 710,
    "D_mm": 1030,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 10600,
    "static_load_kN": 21600,
    "fatigue_load_limit_kN": 1320,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "weight_g": 865000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 40/710 M is the dimension series 40 CARB toroidal roller bearings member of the CARB range: 710 mm bore, 1030 mm OD, 315 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (40) identify the ISO dimension series and the last two (710 mm (slash-size)) encode the 710 mm bore; suffixes describe bore and execution. The cylindrical 710 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 710×1030×315 mm are identical — only the mounting method changes. The 865000 g mass over the 710×1030×315 mm envelope yields about 14.93 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 710 mm bore the 865 kg mass and 315 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 320 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 40/710 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 10600/21600 kN ratings belong to this exact execution (C 40/710 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 10600/21600 kN ratings and 865000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is C 40/710 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 40/710 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 40/710 M have?",
        "a": "A C 40/710 M measures 710 mm bore × 1030 mm outside diameter × 315 mm width (27.953 × 40.551 × 12.402 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10600 kN, static C0 21600 kN, fatigue limit Pu 1320 kN, reference speed 320 r/min, limiting speed 430 r/min, mass about 865000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C40-710-K30M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 710×1030×315 mm ISO 15 envelope and equivalent catalogue C/C0; C 40/710 K30M is the 1:30 tapered-bore K30 M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C40-710-M",
      "C 40/710 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C40-710-K30M",
    "brand": "SKF",
    "manufacturer_designation": "C 40/710 K30M",
    "series": "C4000-series",
    "type": "carb_toroidal",
    "d_mm": 710,
    "D_mm": 1030,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 10600,
    "static_load_kN": 21600,
    "fatigue_load_limit_kN": 1320,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "weight_g": 865000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 40/710 K30M belongs to the CARB family — compact aligning roller bearings: envelope 710×1030×315 mm, radial rating 10600/21600 kN C/C0, and no axial-locating function by design. In C 40/710 K30M the 40 dimension series fixes the 1030 mm OD and 315 mm width around the 710 mm bore (the bore is written directly after the slash (no bore code)); the suffix K30M then selects the tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 710 mm seat. Selection arithmetic: C 10600 kN against C0 21600 kN gives a C0/C ratio of 2.04, and the 1320 kN fatigue load limit Pu sets the contamination-adjusted life floor. Mounting: mount on the withdrawal (AH) sleeve matched to the 1:30 tapered bore, drive up to the catalogue reduction and lock the nut; never press through the 315 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 710 mm bore the 865 kg mass and 315 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 40/710 K30M must float; the two are designed to be used as a pair.",
      "The quoted 10600/21600 kN ratings belong to this exact execution (C 40/710 K30M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 40/710 K30M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 10600/21600 kN ratings and 865000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 40/710 K30M mounted?",
        "a": "The tapered 1:30 bore mounts on a withdrawal (AH) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 40/710 K30M?",
        "a": "A C 40/710 K30M measures 710 mm bore × 1030 mm outside diameter × 315 mm width (27.953 × 40.551 × 12.402 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10600 kN, static C0 21600 kN, fatigue limit Pu 1320 kN, reference speed 320 r/min, limiting speed 430 r/min, mass about 865000 g."
      },
      {
        "q": "Can a CARB bearing like C 40/710 K30M locate the shaft axially?",
        "a": "No — that is the defining feature. C 40/710 K30M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 40/710 K30M designation read?",
        "a": "C = CARB toroidal family; 40 = dimension series; 710 mm (slash-size) = 710 mm bore (the bore is written directly after the slash (no bore code)); suffix K30M selects tapered 1:30 bore for withdrawal (AH) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C40-710-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 710×1030×315 mm ISO 15 envelope and equivalent catalogue C/C0; C 40/710 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C40-710-K30M",
      "C 40/710 K30M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-710-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 31/710 MB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 710,
    "D_mm": 1150,
    "B_mm": 345,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 13400,
    "static_load_kN": 25500,
    "fatigue_load_limit_kN": 1530,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 480,
    "max_rpm": 480,
    "weight_g": 1470000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 31/710 MB: the toroidal rollers allow the 710 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. SKF builds the CARB order number from size plus execution: the bare number C 31/710 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here MB. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 710 mm seat. Speed planning separates the 340 r/min thermal reference from the 480 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1150 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 710 mm bore the 1470 kg mass and 345 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 340 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 31/710 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 13400/25500 kN ratings belong to this exact execution (C 31/710 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 13400/25500 kN ratings and 1470000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is C 31/710 MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 31/710 MB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 31/710 MB have?",
        "a": "A C 31/710 MB measures 710 mm bore × 1150 mm outside diameter × 345 mm width (27.953 × 45.276 × 13.583 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13400 kN, static C0 25500 kN, fatigue limit Pu 1530 kN, reference speed 340 r/min, limiting speed 480 r/min, mass about 1470000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-710-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 710×1150×345 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/710 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-710-MB",
      "C 31/710 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-710-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 31/710 KMB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 710,
    "D_mm": 1150,
    "B_mm": 345,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 13400,
    "static_load_kN": 25500,
    "fatigue_load_limit_kN": 1530,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 480,
    "max_rpm": 480,
    "weight_g": 1470000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 31/710 KMB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 710×1150×345 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 31/710 KMB the 31 dimension series fixes the 1150 mm OD and 345 mm width around the 710 mm bore (the bore is written directly after the slash (no bore code)); the suffix KMB then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 710 mm seat. Selection arithmetic: C 13400 kN against C0 25500 kN gives a C0/C ratio of 1.90, and the 1530 kN fatigue load limit Pu sets the contamination-adjusted life floor. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1150 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 710 mm bore the 1470 kg mass and 345 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Never use C 31/710 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 710 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 340 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 13400/25500 kN ratings belong to this exact execution (C 31/710 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 13400/25500 kN ratings and 1470000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the C 31/710 KMB designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 710 mm (slash-size) = 710 mm bore (the bore is written directly after the slash (no bore code)); suffix KMB selects tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (13400 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/710 KMB is the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 31/710 KMB mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 31/710 KMB?",
        "a": "A C 31/710 KMB measures 710 mm bore × 1150 mm outside diameter × 345 mm width (27.953 × 45.276 × 13.583 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13400 kN, static C0 25500 kN, fatigue limit Pu 1530 kN, reference speed 340 r/min, limiting speed 480 r/min, mass about 1470000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-710-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 710×1150×345 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/710 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-710-KMB",
      "C 31/710 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-750-M",
    "brand": "SKF",
    "manufacturer_designation": "C 39/750 M",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 750,
    "D_mm": 1000,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6100,
    "static_load_kN": 13400,
    "fatigue_load_limit_kN": 815,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 560,
    "max_rpm": 560,
    "weight_g": 410000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists C 39/750 M in the dimension series 39 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. SKF builds the CARB order number from size plus execution: the bare number C 39/750 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. The cylindrical 750 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 750×1000×185 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 185 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1000 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 750 mm bore the 410 kg mass and 185 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 750 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 39/750 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 6100/13400 kN ratings belong to this exact execution (C 39/750 M); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 6100/13400 kN ratings and 410000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 39/750 M mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 750 mm bore; M is the execution (cylindrical bore for direct shaft fitting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 39/750 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 39/750 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-750-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 750×1000×185 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/750 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-750-M",
      "C 39/750 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-750-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 39/750 KM",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 750,
    "D_mm": 1000,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6100,
    "static_load_kN": 13400,
    "fatigue_load_limit_kN": 815,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 560,
    "max_rpm": 560,
    "weight_g": 410000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 39/750 KM is the dimension series 39 CARB toroidal roller bearings member of the CARB range: 750 mm bore, 1000 mm OD, 185 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (750 mm (slash-size)) encode the 750 mm bore; suffixes describe bore and execution. The K suffix gives a 1:12 tapered 750 mm bore, mounted on an adapter (H) sleeve so the bearing can be driven up to the specified clearance. The same size is listed in both bore executions, and the boundary dimensions 750×1000×185 mm are identical — only the mounting method changes. Speed planning separates the 430 r/min thermal reference from the 560 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 185 mm wide cavity does not fill itself.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 750 mm bore the 410 kg mass and 185 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/750 KM must float; the two are designed to be used as a pair.",
      "Never use C 39/750 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 750 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 430 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 6100/13400 kN ratings and 410000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 39/750 KM have?",
        "a": "A C 39/750 KM measures 750 mm bore × 1000 mm outside diameter × 185 mm width (29.528 × 39.37 × 7.283 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6100 kN, static C0 13400 kN, fatigue limit Pu 815 kN, reference speed 430 r/min, limiting speed 560 r/min, mass about 410000 g."
      },
      {
        "q": "What does C 39/750 KM mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 750 mm bore; KM is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 39/750 KM used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-750-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 750×1000×185 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/750 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-750-KM",
      "C 39/750 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-750-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 30/750 MB",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 750,
    "D_mm": 1090,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9500,
    "static_load_kN": 19300,
    "fatigue_load_limit_kN": 1160,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 530,
    "max_rpm": 530,
    "weight_g": 838000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/750 MB belongs to the CARB family — compact aligning roller bearings: envelope 750×1090×250 mm, radial rating 9500/19300 kN C/C0, and no axial-locating function by design. In C 30/750 MB the 30 dimension series fixes the 1090 mm OD and 250 mm width around the 750 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The cylindrical 750 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 750×1090×250 mm are identical — only the mounting method changes. The 838000 g mass over the 750×1090×250 mm envelope yields about 12.67 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 250 mm wide cavity does not fill itself.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 750 mm bore the 838 kg mass and 250 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Reference and limiting speeds are different limits: the 380 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 9500/19300 kN ratings belong to this exact execution (C 30/750 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/750 MB must float; the two are designed to be used as a pair.",
      "The 9500/19300 kN ratings and 838000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 30/750 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 30/750 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 30/750 MB designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 750 mm (slash-size) = 750 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (9500 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/750 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 30/750 MB mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 750 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 250 mm roller set."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-750-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 750×1090×250 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/750 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-750-MB",
      "C 30/750 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-750-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 30/750 KMB",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 750,
    "D_mm": 1090,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9500,
    "static_load_kN": 19300,
    "fatigue_load_limit_kN": 1160,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 530,
    "max_rpm": 530,
    "weight_g": 838000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/750 KMB belongs to the CARB family — compact aligning roller bearings: envelope 750×1090×250 mm, radial rating 9500/19300 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (750 mm (slash-size)) encode the 750 mm bore; suffixes describe bore and execution. The KMB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 30/750 KMB deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1090 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 750 mm bore the 838 kg mass and 250 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 750 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 380 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 9500/19300 kN ratings belong to this exact execution (C 30/750 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 9500/19300 kN ratings and 838000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 30/750 KMB mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 750 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 30/750 KMB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 30/750 KMB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-750-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 750×1090×250 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/750 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-750-KMB",
      "C 30/750 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-750-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 31/750 MB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 750,
    "D_mm": 1220,
    "B_mm": 365,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 16000,
    "static_load_kN": 30500,
    "fatigue_load_limit_kN": 1800,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "weight_g": 1800000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 31/750 MB is the dimension series 31 CARB toroidal roller bearings member of the CARB range: 750 mm bore, 1220 mm OD, 365 mm width, with the asymmetrical-looking toroidal roller set that defines the CARB principle. Reading the code: C marks the CARB toroidal family, the first two digits (31) identify the ISO dimension series and the last two (750 mm (slash-size)) encode the 750 mm bore; suffixes describe bore and execution. The cylindrical 750 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 750×1220×365 mm are identical — only the mounting method changes. Selection arithmetic: C 16000 kN against C0 30500 kN gives a C0/C ratio of 1.91, and the 1800 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 750 mm bore the 1800 kg mass and 365 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 750 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 320 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 16000/30500 kN ratings belong to this exact execution (C 31/750 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 31/750 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 16000/30500 kN ratings and 1800000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 31/750 MB have?",
        "a": "A C 31/750 MB measures 750 mm bore × 1220 mm outside diameter × 365 mm width (29.528 × 48.031 × 14.37 in). From SKF catalogue PUB BU/P1 17000: dynamic C 16000 kN, static C0 30500 kN, fatigue limit Pu 1800 kN, reference speed 320 r/min, limiting speed 450 r/min, mass about 1800000 g."
      },
      {
        "q": "What does C 31/750 MB mean in SKF part numbering?",
        "a": "C marks CARB; 31 the dimension series; the size code gives 750 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 31/750 MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 31/750 MB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-750-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 750×1220×365 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/750 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-750-MB",
      "C 31/750 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-750-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 31/750 KMB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 750,
    "D_mm": 1220,
    "B_mm": 365,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 16000,
    "static_load_kN": 30500,
    "fatigue_load_limit_kN": 1800,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "weight_g": 1800000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 31/750 KMB belongs to the CARB family — compact aligning roller bearings: envelope 750×1220×365 mm, radial rating 16000/30500 kN C/C0, and no axial-locating function by design. The designation C 31/750 KMB separates into C (CARB), 31 (dimension series), 750 mm (slash-size) (750 mm bore — bore 750 mm is written directly after the slash) and KMB (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)); envelope 750×1220×365 mm follows the ISO 15 plan. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 750 mm seat. Speed planning separates the 320 r/min thermal reference from the 450 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 750 mm bore the 1800 kg mass and 365 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/750 KMB must float; the two are designed to be used as a pair.",
      "Never use C 31/750 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 750 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 16000/30500 kN ratings and 1800000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 31/750 KMB locate the shaft axially?",
        "a": "No — that is the defining feature. C 31/750 KMB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 31/750 KMB designation read?",
        "a": "C = CARB toroidal family; 31 = dimension series; 750 mm (slash-size) = 750 mm bore (the bore is written directly after the slash (no bore code)); suffix KMB selects tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (16000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/750 KMB is the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 31/750 KMB mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-750-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 750×1220×365 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/750 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-750-KMB",
      "C 31/750 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-800-M",
    "brand": "SKF",
    "manufacturer_designation": "C 39/800 M",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 800,
    "D_mm": 1060,
    "B_mm": 195,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6400,
    "static_load_kN": 14600,
    "fatigue_load_limit_kN": 880,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 530,
    "max_rpm": 530,
    "weight_g": 480000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 39/800 M is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 800×1060×195 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. The designation C 39/800 M separates into C (CARB), 39 (dimension series), 800 mm (slash-size) (800 mm bore — bore 800 mm is written directly after the slash) and M (cylindrical bore for direct shaft fitting, machined brass M cage); envelope 800×1060×195 mm follows the ISO 15 plan. The M suffix is a one-piece machined brass cage centred on the rollers, supplied for the 800 mm and larger sizes needing robust guidance under heavy load. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 39/800 M deliberately carries none. Mounting: slide the bearing onto the 800 mm seat or heat it (max 120 °C) and seat it square; never press through the 195 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 800 mm bore the 480 kg mass and 195 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/800 M must float; the two are designed to be used as a pair.",
      "Never use C 39/800 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 800 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 6400/14600 kN ratings and 480000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (6400 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 39/800 M is the cylindrical bore for direct shaft fitting, machined brass M cage."
      },
      {
        "q": "How is C 39/800 M mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 800 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 195 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 39/800 M?",
        "a": "A C 39/800 M measures 800 mm bore × 1060 mm outside diameter × 195 mm width (31.496 × 41.732 × 7.677 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6400 kN, static C0 14600 kN, fatigue limit Pu 880 kN, reference speed 380 r/min, limiting speed 530 r/min, mass about 480000 g."
      },
      {
        "q": "Can a CARB bearing like C 39/800 M locate the shaft axially?",
        "a": "No — that is the defining feature. C 39/800 M deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-800-M",
      "C 39/800 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-800-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 30/800 MB",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 800,
    "D_mm": 1150,
    "B_mm": 258,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9300,
    "static_load_kN": 19300,
    "fatigue_load_limit_kN": 1140,
    "reference_speed_rpm": 360,
    "limiting_speed_rpm": 480,
    "max_rpm": 480,
    "weight_g": 941000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/800 MB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 800×1150×258 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (800 mm (slash-size)) encode the 800 mm bore; suffixes describe bore and execution. The cylindrical 800 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 800×1150×258 mm are identical — only the mounting method changes. Speed planning separates the 360 r/min thermal reference from the 480 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 800 mm bore the 941 kg mass and 258 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/800 MB must float; the two are designed to be used as a pair.",
      "Never use C 30/800 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 800 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 9300/19300 kN ratings and 941000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Is the C 30/800 MB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 30/800 MB have?",
        "a": "A C 30/800 MB measures 800 mm bore × 1150 mm outside diameter × 258 mm width (31.496 × 45.276 × 10.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9300 kN, static C0 19300 kN, fatigue limit Pu 1140 kN, reference speed 360 r/min, limiting speed 480 r/min, mass about 941000 g."
      },
      {
        "q": "What does C 30/800 MB mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 800 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-800-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 800×1150×258 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/800 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-800-MB",
      "C 30/800 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-800-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 30/800 KMB",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 800,
    "D_mm": 1150,
    "B_mm": 258,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9300,
    "static_load_kN": 19300,
    "fatigue_load_limit_kN": 1140,
    "reference_speed_rpm": 360,
    "limiting_speed_rpm": 480,
    "max_rpm": 480,
    "weight_g": 941000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 30/800 KMB: the toroidal rollers allow the 800 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. The designation C 30/800 KMB separates into C (CARB), 30 (dimension series), 800 mm (slash-size) (800 mm bore — bore 800 mm is written directly after the slash) and KMB (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)); envelope 800×1150×258 mm follows the ISO 15 plan. The KMB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 30/800 KMB deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1150 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 800 mm bore the 941 kg mass and 258 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Never use C 30/800 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 800 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The quoted 9300/19300 kN ratings belong to this exact execution (C 30/800 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 9300/19300 kN ratings and 941000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 30/800 KMB mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 30/800 KMB?",
        "a": "A C 30/800 KMB measures 800 mm bore × 1150 mm outside diameter × 258 mm width (31.496 × 45.276 × 10.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9300 kN, static C0 19300 kN, fatigue limit Pu 1140 kN, reference speed 360 r/min, limiting speed 480 r/min, mass about 941000 g."
      },
      {
        "q": "Can a CARB bearing like C 30/800 KMB locate the shaft axially?",
        "a": "No — that is the defining feature. C 30/800 KMB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 30/800 KMB designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 800 mm (slash-size) = 800 mm bore (the bore is written directly after the slash (no bore code)); suffix KMB selects tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-800-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 800×1150×258 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/800 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-800-KMB",
      "C 30/800 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-850-M",
    "brand": "SKF",
    "manufacturer_designation": "C 39/850 M",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 850,
    "D_mm": 1120,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 7350,
    "static_load_kN": 16300,
    "fatigue_load_limit_kN": 960,
    "reference_speed_rpm": 360,
    "limiting_speed_rpm": 480,
    "max_rpm": 480,
    "weight_g": 540000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 39/850 M denotes a toroidal roller bearing whose 200 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 39/850 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here M. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 850 mm seat. Selection arithmetic: C 7350 kN against C0 16300 kN gives a C0/C ratio of 2.22, and the 960 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 850 mm bore the 540 kg mass and 200 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/850 M must float; the two are designed to be used as a pair.",
      "Never use C 39/850 M as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 850 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 360 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The 7350/16300 kN ratings and 540000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is C 39/850 M used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 39/850 M sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 39/850 M have?",
        "a": "A C 39/850 M measures 850 mm bore × 1120 mm outside diameter × 200 mm width (33.465 × 44.094 × 7.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 7350 kN, static C0 16300 kN, fatigue limit Pu 960 kN, reference speed 360 r/min, limiting speed 480 r/min, mass about 540000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-850-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 850×1120×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/850 KM is the 1:12 tapered-bore K M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-850-M",
      "C 39/850 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-850-KM",
    "brand": "SKF",
    "manufacturer_designation": "C 39/850 KM",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 850,
    "D_mm": 1120,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 7350,
    "static_load_kN": 16300,
    "fatigue_load_limit_kN": 960,
    "reference_speed_rpm": 360,
    "limiting_speed_rpm": 480,
    "max_rpm": 480,
    "weight_g": 540000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 39/850 KM denotes a toroidal roller bearing whose 200 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. The designation C 39/850 KM separates into C (CARB), 39 (dimension series), 850 mm (slash-size) (850 mm bore — bore 850 mm is written directly after the slash) and KM (tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage); envelope 850×1120×200 mm follows the ISO 15 plan. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 850 mm shaft deflects; the 360 r/min reference and 480 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 39/850 KM deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1120 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 850 mm bore the 540 kg mass and 200 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Reference and limiting speeds are different limits: the 360 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 7350/16300 kN ratings belong to this exact execution (C 39/850 KM); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 850 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Never use C 39/850 KM as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 7350/16300 kN ratings and 540000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 39/850 KM locate the shaft axially?",
        "a": "No — that is the defining feature. C 39/850 KM deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 39/850 KM designation read?",
        "a": "C = CARB toroidal family; 39 = dimension series; 850 mm (slash-size) = 850 mm bore (the bore is written directly after the slash (no bore code)); suffix KM selects tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage. K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (7350 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 39/850 KM is the tapered 1:12 bore for adapter (H) sleeve mounting, machined brass M cage."
      },
      {
        "q": "How is C 39/850 KM mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-850-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 850×1120×200 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/850 M is the cylindrical-bore M brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-850-KM",
      "C 39/850 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-850-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 30/850 MB",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 850,
    "D_mm": 1220,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 11600,
    "static_load_kN": 24500,
    "fatigue_load_limit_kN": 1430,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "weight_g": 1110000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists C 30/850 MB in the dimension series 30 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. In C 30/850 MB the 30 dimension series fixes the 1220 mm OD and 272 mm width around the 850 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 850 mm shaft deflects; the 320 r/min reference and 450 r/min limiting speed are both catalogue values. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 30/850 MB deliberately carries none. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1220 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 850 mm bore the 1110 kg mass and 272 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/850 MB must float; the two are designed to be used as a pair.",
      "Never use C 30/850 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 850 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 11600/24500 kN ratings and 1110000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (11600 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/850 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 30/850 MB mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 850 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 272 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 30/850 MB?",
        "a": "A C 30/850 MB measures 850 mm bore × 1220 mm outside diameter × 272 mm width (33.465 × 48.031 × 10.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11600 kN, static C0 24500 kN, fatigue limit Pu 1430 kN, reference speed 320 r/min, limiting speed 450 r/min, mass about 1110000 g."
      },
      {
        "q": "Can a CARB bearing like C 30/850 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 30/850 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-850-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 850×1220×272 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/850 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-850-MB",
      "C 30/850 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-850-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 30/850 KMB",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 850,
    "D_mm": 1220,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 11600,
    "static_load_kN": 24500,
    "fatigue_load_limit_kN": 1430,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "weight_g": 1110000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/850 KMB belongs to the CARB family — compact aligning roller bearings: envelope 850×1220×272 mm, radial rating 11600/24500 kN C/C0, and no axial-locating function by design. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (850 mm (slash-size)) encode the 850 mm bore; suffixes describe bore and execution. The KMB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 30/850 KMB deliberately carries none. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 272 mm wide cavity does not fill itself.",
    "applications": [
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 850 mm bore the 1110 kg mass and 272 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 850 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 320 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/850 KMB must float; the two are designed to be used as a pair.",
      "The 11600/24500 kN ratings and 1110000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does C 30/850 KMB mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 850 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 30/850 KMB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 30/850 KMB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-850-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 850×1220×272 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/850 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-850-KMB",
      "C 30/850 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-900-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 30/900 MB",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 900,
    "D_mm": 1280,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 12700,
    "static_load_kN": 26500,
    "fatigue_load_limit_kN": 1530,
    "reference_speed_rpm": 300,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "weight_g": 1200000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 30/900 MB belongs to the CARB family — compact aligning roller bearings: envelope 900×1280×280 mm, radial rating 12700/26500 kN C/C0, and no axial-locating function by design. The designation C 30/900 MB separates into C (CARB), 30 (dimension series), 900 mm (slash-size) (900 mm bore — bore 900 mm is written directly after the slash) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 900×1280×280 mm follows the ISO 15 plan. The MB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Selection arithmetic: C 12700 kN against C0 26500 kN gives a C0/C ratio of 2.09, and the 1530 kN fatigue load limit Pu sets the contamination-adjusted life floor. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 900 mm bore the 1200 kg mass and 280 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Reference and limiting speeds are different limits: the 300 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 12700/26500 kN ratings belong to this exact execution (C 30/900 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 30/900 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 900 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 12700/26500 kN ratings and 1200000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 30/900 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 30/900 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 30/900 MB designation read?",
        "a": "C = CARB toroidal family; 30 = dimension series; 900 mm (slash-size) = 900 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (12700 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/900 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 30/900 MB mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 900 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 280 mm roller set."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-900-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 900×1280×280 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/900 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-900-MB",
      "C 30/900 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-900-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 30/900 KMB",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 900,
    "D_mm": 1280,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 12700,
    "static_load_kN": 26500,
    "fatigue_load_limit_kN": 1530,
    "reference_speed_rpm": 300,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "weight_g": 1200000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 30/900 KMB: the toroidal rollers allow the 900 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (900 mm (slash-size)) encode the 900 mm bore; suffixes describe bore and execution. The KMB suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 280 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 280 mm wide cavity does not fill itself.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 900 mm bore the 1200 kg mass and 280 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 30/900 KMB must float; the two are designed to be used as a pair.",
      "Never use C 30/900 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 900 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "The 12700/26500 kN ratings and 1200000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 30/900 KMB have?",
        "a": "A C 30/900 KMB measures 900 mm bore × 1280 mm outside diameter × 280 mm width (35.433 × 50.394 × 11.024 in). From SKF catalogue PUB BU/P1 17000: dynamic C 12700 kN, static C0 26500 kN, fatigue limit Pu 1530 kN, reference speed 300 r/min, limiting speed 400 r/min, mass about 1200000 g."
      },
      {
        "q": "What does C 30/900 KMB mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 900 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 30/900 KMB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30-900-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 900×1280×280 mm ISO 15 envelope and equivalent catalogue C/C0; C 30/900 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-900-KMB",
      "C 30/900 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-950-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 30/950 MB",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 950,
    "D_mm": 1360,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 13200,
    "static_load_kN": 28500,
    "fatigue_load_limit_kN": 1600,
    "reference_speed_rpm": 280,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "weight_g": 1480000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For long shafts that grow thermally, SKF supplies C 30/950 MB: the toroidal rollers allow the 950 mm inner ring to displace axially without induced thrust, while still accommodating shaft deflection like a spherical bearing. Reading the code: C marks the CARB toroidal family, the first two digits (30) identify the ISO dimension series and the last two (950 mm (slash-size)) encode the 950 mm bore; suffixes describe bore and execution. The cylindrical 950 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 950×1360×300 mm are identical — only the mounting method changes. The 1480000 g mass over the 950×1360×300 mm envelope yields about 13.89 kN dynamic per millimetre of bore — the long toroidal rollers give this family its radial capacity density. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 950 mm bore the 1480 kg mass and 300 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 950 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 280 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "Never use C 30/950 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 13200/28500 kN ratings belong to this exact execution (C 30/950 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 13200/28500 kN ratings and 1480000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 30/950 MB have?",
        "a": "A C 30/950 MB measures 950 mm bore × 1360 mm outside diameter × 300 mm width (37.402 × 53.543 × 11.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13200 kN, static C0 28500 kN, fatigue limit Pu 1600 kN, reference speed 280 r/min, limiting speed 380 r/min, mass about 1480000 g."
      },
      {
        "q": "What does C 30/950 MB mean in SKF part numbering?",
        "a": "C marks CARB; 30 the dimension series; the size code gives 950 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 30/950 MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 30/950 MB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-950-MB",
      "C 30/950 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C30-1000-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 30/1000 MB",
    "series": "C3000-series",
    "type": "carb_toroidal",
    "d_mm": 1000,
    "D_mm": 1420,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 13700,
    "static_load_kN": 30500,
    "fatigue_load_limit_kN": 1700,
    "reference_speed_rpm": 260,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "weight_g": 1680000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 30/1000 MB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 1000 mm bore, 1420 mm outside diameter, 308 mm wide unit rated 13700 kN dynamic. In C 30/1000 MB the 30 dimension series fixes the 1420 mm OD and 308 mm width around the 1000 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 1000 mm shaft deflects; the 260 r/min reference and 360 r/min limiting speed are both catalogue values. Selection arithmetic: C 13700 kN against C0 30500 kN gives a C0/C ratio of 2.23, and the 1700 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 308 mm wide cavity does not fill itself.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 1000 mm bore the 1680 kg mass and 308 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Never use C 30/1000 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 1000 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 260 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 13700/30500 kN ratings belong to this exact execution (C 30/1000 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 13700/30500 kN ratings and 1680000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (13700 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 30/1000 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 30/1000 MB mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 1000 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 308 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 30/1000 MB?",
        "a": "A C 30/1000 MB measures 1000 mm bore × 1420 mm outside diameter × 308 mm width (39.37 × 55.906 × 12.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13700 kN, static C0 30500 kN, fatigue limit Pu 1700 kN, reference speed 260 r/min, limiting speed 360 r/min, mass about 1680000 g."
      },
      {
        "q": "Can a CARB bearing like C 30/1000 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 30/1000 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C30",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C30-1000-MB",
      "C 30/1000 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-1000-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 31/1000 MB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 1000,
    "D_mm": 1580,
    "B_mm": 462,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 20400,
    "static_load_kN": 45500,
    "fatigue_load_limit_kN": 2500,
    "reference_speed_rpm": 220,
    "limiting_speed_rpm": 300,
    "max_rpm": 300,
    "weight_g": 3800000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 31/1000 MB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 1000 mm bore, 1580 mm outside diameter, 462 mm wide unit rated 20400 kN dynamic. In C 31/1000 MB the 31 dimension series fixes the 1580 mm OD and 462 mm width around the 1000 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The cylindrical 1000 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 1000×1580×462 mm are identical — only the mounting method changes. Speed planning separates the 220 r/min thermal reference from the 300 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1580 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 1000 mm bore the 3800 kg mass and 462 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Reference and limiting speeds are different limits: the 220 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 20400/45500 kN ratings belong to this exact execution (C 31/1000 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/1000 MB must float; the two are designed to be used as a pair.",
      "Never use C 31/1000 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 20400/45500 kN ratings and 3800000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (20400 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/1000 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 31/1000 MB mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 1000 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 462 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 31/1000 MB?",
        "a": "A C 31/1000 MB measures 1000 mm bore × 1580 mm outside diameter × 462 mm width (39.37 × 62.205 × 18.189 in). From SKF catalogue PUB BU/P1 17000: dynamic C 20400 kN, static C0 45500 kN, fatigue limit Pu 2500 kN, reference speed 220 r/min, limiting speed 300 r/min, mass about 3800000 g."
      },
      {
        "q": "Can a CARB bearing like C 31/1000 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 31/1000 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-1000-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 1000×1580×462 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/1000 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-1000-MB",
      "C 31/1000 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C31-1000-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 31/1000 KMB",
    "series": "C3100-series",
    "type": "carb_toroidal",
    "d_mm": 1000,
    "D_mm": 1580,
    "B_mm": 462,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 20400,
    "static_load_kN": 45500,
    "fatigue_load_limit_kN": 2500,
    "reference_speed_rpm": 220,
    "limiting_speed_rpm": 300,
    "max_rpm": 300,
    "weight_g": 3800000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 31/1000 KMB denotes a toroidal roller bearing whose 462 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. In C 31/1000 KMB the 31 dimension series fixes the 1580 mm OD and 462 mm width around the 1000 mm bore (the bore is written directly after the slash (no bore code)); the suffix KMB then selects the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB). The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 1000 mm shaft deflects; the 220 r/min reference and 300 r/min limiting speed are both catalogue values. Selection arithmetic: C 20400 kN against C0 45500 kN gives a C0/C ratio of 2.23, and the 2500 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 462 mm wide cavity does not fill itself.",
    "applications": [
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 1000 mm bore the 3800 kg mass and 462 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 31/1000 KMB must float; the two are designed to be used as a pair.",
      "Reference and limiting speeds are different limits: the 220 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 20400/45500 kN ratings belong to this exact execution (C 31/1000 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 20400/45500 kN ratings and 3800000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (20400 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 31/1000 KMB is the tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 31/1000 KMB mounted?",
        "a": "The tapered 1:12 bore mounts on an adapter (H) sleeve with a defined drive-up; heat the bearing to max 120 °C when fitting, support full ring faces, and verify axial float afterwards."
      },
      {
        "q": "What are the dimensions and ratings of the C 31/1000 KMB?",
        "a": "A C 31/1000 KMB measures 1000 mm bore × 1580 mm outside diameter × 462 mm width (39.37 × 62.205 × 18.189 in). From SKF catalogue PUB BU/P1 17000: dynamic C 20400 kN, static C0 45500 kN, fatigue limit Pu 2500 kN, reference speed 220 r/min, limiting speed 300 r/min, mass about 3800000 g."
      },
      {
        "q": "Can a CARB bearing like C 31/1000 KMB locate the shaft axially?",
        "a": "No — that is the defining feature. C 31/1000 KMB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C31-1000-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 1000×1580×462 mm ISO 15 envelope and equivalent catalogue C/C0; C 31/1000 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C31-1000-KMB",
      "C 31/1000 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-1060-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 39/1060 MB",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 1060,
    "D_mm": 1400,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 11000,
    "static_load_kN": 26000,
    "fatigue_load_limit_kN": 1430,
    "reference_speed_rpm": 260,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "weight_g": 1120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 39/1060 MB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 1060 mm bore, 1400 mm outside diameter, 250 mm wide unit rated 11000 kN dynamic. The designation C 39/1060 MB separates into C (CARB), 39 (dimension series), 1060 mm (slash-size) (1060 mm bore — bore 1060 mm is written directly after the slash) and MB (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)); envelope 1060×1400×250 mm follows the ISO 15 plan. The cylindrical 1060 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 1060×1400×250 mm are identical — only the mounting method changes. Speed planning separates the 260 r/min thermal reference from the 360 r/min mechanical limiting speed. The full-complement V executions carry more load but list no thermal reference speed; the brass-caged executions run faster and cooler at light load. After fitting, confirm the inner ring can be pushed axially by hand through the catalogue displacement range; a ring that will not slide means the position is locked and will preload in service.",
    "applications": [
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load",
      "heavy industrial gearbox layshafts used as the non-locating position"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set"
    ],
    "pitfalls": [
      "At 1060 mm bore the 1120 kg mass and 250 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Never use C 39/1060 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 1060 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/1060 MB must float; the two are designed to be used as a pair.",
      "The 11000/26000 kN ratings and 1120000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (11000 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 39/1060 MB is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 39/1060 MB mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 1060 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 250 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 39/1060 MB?",
        "a": "A C 39/1060 MB measures 1060 mm bore × 1400 mm outside diameter × 250 mm width (41.732 × 55.118 × 9.843 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11000 kN, static C0 26000 kN, fatigue limit Pu 1430 kN, reference speed 260 r/min, limiting speed 360 r/min, mass about 1120000 g."
      },
      {
        "q": "Can a CARB bearing like C 39/1060 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 39/1060 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-1060-KMB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 1060×1400×250 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/1060 KMB is the 1:12 tapered-bore K MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-1060-MB",
      "C 39/1060 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-1060-KMB",
    "brand": "SKF",
    "manufacturer_designation": "C 39/1060 KMB",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 1060,
    "D_mm": 1400,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 11000,
    "static_load_kN": 26000,
    "fatigue_load_limit_kN": 1430,
    "reference_speed_rpm": 260,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "weight_g": 1120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The CARB bearing C 39/1060 KMB combines the self-aligning behaviour of a spherical roller bearing with the axial freedom of a cylindrical bearing in one 1060 mm bore, 1400 mm outside diameter, 250 mm wide unit rated 11000 kN dynamic. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (1060 mm (slash-size)) encode the 1060 mm bore; suffixes describe bore and execution. The open execution relies on the housing seals and lubrication system, fed through groove/hole features on the large sizes. Explorer-class heat treatment and the crowned roller profile keep edge stress down when the 1060 mm shaft deflects; the 260 r/min reference and 360 r/min limiting speed are both catalogue values. Selection arithmetic: C 11000 kN against C0 26000 kN gives a C0/C ratio of 2.36, and the 1430 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 250 mm wide cavity does not fill itself.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "condensation pitting in machines that run intermittently in humid environments",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 1060 mm bore the 1120 kg mass and 250 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/1060 KMB must float; the two are designed to be used as a pair.",
      "Never use C 39/1060 KMB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "Reference and limiting speeds are different limits: the 260 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 11000/26000 kN ratings belong to this exact execution (C 39/1060 KMB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "The 11000/26000 kN ratings and 1120000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the C 39/1060 KMB have?",
        "a": "A C 39/1060 KMB measures 1060 mm bore × 1400 mm outside diameter × 250 mm width (41.732 × 55.118 × 9.843 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11000 kN, static C0 26000 kN, fatigue limit Pu 1430 kN, reference speed 260 r/min, limiting speed 360 r/min, mass about 1120000 g."
      },
      {
        "q": "What does C 39/1060 KMB mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 1060 mm bore; KMB is the execution (tapered 1:12 bore for adapter (H) sleeve mounting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 39/1060 KMB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 39/1060 KMB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39-1060-MB",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 1060×1400×250 mm ISO 15 envelope and equivalent catalogue C/C0; C 39/1060 MB is the cylindrical-bore MB inner-ring-guided brass-caged execution of this size — boundary dimensions interchangeable, only mounting and cage execution differ."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-1060-KMB",
      "C 39/1060 KMB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C49-1120-MB1",
    "brand": "SKF",
    "manufacturer_designation": "C 49/1120 MB1",
    "series": "C4900-series",
    "type": "carb_toroidal",
    "d_mm": 1120,
    "D_mm": 1460,
    "B_mm": 335,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 13200,
    "static_load_kN": 31500,
    "fatigue_load_limit_kN": 1700,
    "reference_speed_rpm": 200,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "weight_g": 1630000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 49/1120 MB1 belongs to the CARB family — compact aligning roller bearings: envelope 1120×1460×335 mm, radial rating 13200/31500 kN C/C0, and no axial-locating function by design. In C 49/1120 MB1 the 49 dimension series fixes the 1460 mm OD and 335 mm width around the 1120 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB1 then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The MB1 suffix is a machined two-piece brass cage guided on the inner ring, the standard choice for wide, large-bore CARB sizes where a polymer cage would run beyond its temperature or load limit. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 335 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Mounting: slide the bearing onto the 1120 mm seat or heat it (max 120 °C) and seat it square; never press through the 335 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "thermal preloading when a shaft is located at both ends and growth has nowhere to go",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 1120 mm bore the 1630 kg mass and 335 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Reference and limiting speeds are different limits: the 200 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 13200/31500 kN ratings belong to this exact execution (C 49/1120 MB1); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 1120 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Never use C 49/1120 MB1 as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 13200/31500 kN ratings and 1630000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a CARB bearing like C 49/1120 MB1 locate the shaft axially?",
        "a": "No — that is the defining feature. C 49/1120 MB1 deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 49/1120 MB1 designation read?",
        "a": "C = CARB toroidal family; 49 = dimension series; 1120 mm (slash-size) = 1120 mm bore (the bore is written directly after the slash (no bore code)); suffix MB1 selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      },
      {
        "q": "What is the difference between V and TN9 CARB executions?",
        "a": "V is the full-complement execution with no cage — more rollers, higher C (13200 kN here) but a lower speed ceiling and no thermal reference speed. TN9 is the glass-fibre PA66 caged execution, faster and quieter at somewhat lower load. C 49/1120 MB1 is the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)."
      },
      {
        "q": "How is C 49/1120 MB1 mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 1120 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 335 mm roller set."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C49",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C49-1120-MB1",
      "C 49/1120 MB1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-1180-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 39/1180 MB",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 1180,
    "D_mm": 1540,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 13400,
    "static_load_kN": 33500,
    "fatigue_load_limit_kN": 1800,
    "reference_speed_rpm": 220,
    "limiting_speed_rpm": 300,
    "max_rpm": 300,
    "weight_g": 1400000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, C 39/1180 MB denotes a toroidal roller bearing whose 272 mm long rollers crown at both ends: the contact accepts angular misalignment while the ring positions float, which is why CARB bearings are specified at the free shaft end. SKF builds the CARB order number from size plus execution: the bare number C 39/1180 is the brass-caged cylindrical-bore bearing, K (or K30) makes the bore tapered for sleeve mounting, and the cage/seal letters follow — here MB. The cylindrical 1180 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 1180×1540×272 mm are identical — only the mounting method changes. Float capacity is a selection criterion: the catalogue lists the permissible axial displacement (s) for the 272 mm wide set; size the free-end housing so thermal growth stays within it, not just inside the overall width. Seat tolerances follow the ISO 15 recommendation for the heavy-loaded position — the 1540 mm outer ring typically takes a loose housing fit to preserve float, and the rings must be supported across their full faces.",
    "applications": [
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "edge loading and premature spalling when the CARB position is blocked from its designed axial float",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "grease churning and overheating when a high-speed thrust position is over-packed"
    ],
    "pitfalls": [
      "At 1180 mm bore the 1400 kg mass and 272 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/1180 MB must float; the two are designed to be used as a pair.",
      "Never use C 39/1180 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The quoted 13400/33500 kN ratings belong to this exact execution (C 39/1180 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Do not block the axial displacement in the drawing: housing covers, labyrinth rings and snap rings must leave the catalogue float (s) free, or the bearing silently becomes a poorly located fixed bearing.",
      "The 13400/33500 kN ratings and 1400000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is C 39/1180 MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      },
      {
        "q": "Is the C 39/1180 MB sealed?",
        "a": "No, it is an open execution relying on the housing seals; relubrication follows the groove/hole features of the size."
      },
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 39/1180 MB have?",
        "a": "A C 39/1180 MB measures 1180 mm bore × 1540 mm outside diameter × 272 mm width (46.457 × 60.63 × 10.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13400 kN, static C0 33500 kN, fatigue limit Pu 1800 kN, reference speed 220 r/min, limiting speed 300 r/min, mass about 1400000 g."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-1180-MB",
      "C 39/1180 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-1500-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 39/1500 MB",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 1500,
    "D_mm": 1950,
    "B_mm": 335,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 19600,
    "static_load_kN": 48000,
    "fatigue_load_limit_kN": 2400,
    "reference_speed_rpm": 140,
    "limiting_speed_rpm": 200,
    "max_rpm": 200,
    "weight_g": 2710000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "C 39/1500 MB is a CARB toroidal roller bearing to ISO 15: a single row of long, symmetrical barrel-shaped rollers between guide flanges, sized 1500×1950×335 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 10.1. In C 39/1500 MB the 39 dimension series fixes the 1950 mm OD and 335 mm width around the 1500 mm bore (the bore is written directly after the slash (no bore code)); the suffix MB then selects the cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). The cylindrical 1500 mm bore mounts directly on a machined seat; the outer ring takes a loose housing fit so the bearing can float axially. The same size is listed in both bore executions, and the boundary dimensions 1500×1950×335 mm are identical — only the mounting method changes. Pairing rule: use the CARB bearing opposite one locating spherical or tapered bearing — never at both shaft ends — and check the locating bearing takes 100 % of the thrust, since C 39/1500 MB deliberately carries none. Mounting: slide the bearing onto the 1500 mm seat or heat it (max 120 °C) and seat it square; never press through the 335 mm roller set, and leave the free-end housing shoulder clear so axial float is unrestricted.",
    "applications": [
      "heavy industrial gearbox layshafts used as the non-locating position",
      "winder and reel drums in paper and steel strip plants",
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth"
    ],
    "failure_modes": [
      "raceway spalling once the catalogue L10 life is exceeded or after sustained overload",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "brass cage pocket wear under marginal lubrication in the large-bore M/MB executions",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 1500 mm bore the 2710 kg mass and 335 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Reference and limiting speeds are different limits: the 140 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 19600/48000 kN ratings belong to this exact execution (C 39/1500 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Envelope-identical spherical roller bearings (same ISO 15 d×D×B) are not drop-in equivalents — they locate the shaft axially, while C 39/1500 MB must float; the two are designed to be used as a pair.",
      "Never use C 39/1500 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 19600/48000 kN ratings and 2710000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is C 39/1500 MB mounted?",
        "a": "Slide or heat (max 120 °C) the bearing onto the 1500 mm seat, give the outer ring a loose housing fit, leave the float travel unobstructed, and never press through the 335 mm roller set."
      },
      {
        "q": "What are the dimensions and ratings of the C 39/1500 MB?",
        "a": "A C 39/1500 MB measures 1500 mm bore × 1950 mm outside diameter × 335 mm width (59.055 × 76.772 × 13.189 in). From SKF catalogue PUB BU/P1 17000: dynamic C 19600 kN, static C0 48000 kN, fatigue limit Pu 2400 kN, reference speed 140 r/min, limiting speed 200 r/min, mass about 2710000 g."
      },
      {
        "q": "Can a CARB bearing like C 39/1500 MB locate the shaft axially?",
        "a": "No — that is the defining feature. C 39/1500 MB deliberately allows the inner ring to float axially inside the outer ring while the toroidal rollers self-align. It must be paired with a separate locating bearing (spherical, tapered or angular contact) that takes 100 % of the thrust."
      },
      {
        "q": "How is the C 39/1500 MB designation read?",
        "a": "C = CARB toroidal family; 39 = dimension series; 1500 mm (slash-size) = 1500 mm bore (the bore is written directly after the slash (no bore code)); suffix MB selects cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB). K is a 1:12 tapered bore for an adapter sleeve, K30 a 1:30 bore for a withdrawal sleeve."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-1500-MB",
      "C 39/1500 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "C39-1700-MB",
    "brand": "SKF",
    "manufacturer_designation": "C 39/1700 MB",
    "series": "C3900-series",
    "type": "carb_toroidal",
    "d_mm": 1700,
    "D_mm": 2180,
    "B_mm": 355,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 24000,
    "static_load_kN": 62000,
    "fatigue_load_limit_kN": 3000,
    "reference_speed_rpm": 110,
    "limiting_speed_rpm": 150,
    "max_rpm": 150,
    "weight_g": 3510000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF lists C 39/1700 MB in the dimension series 39 CARB toroidal roller bearings: the toroidal roller profile both follows tolerates angular misalignment and lets the inner ring slide axially inside the outer ring, giving free axial displacement at the non-locating position. Reading the code: C marks the CARB toroidal family, the first two digits (39) identify the ISO dimension series and the last two (1700 mm (slash-size)) encode the 1700 mm bore; suffixes describe bore and execution. CARB bearings locate neither radially nor axially: the inner ring can walk axially inside the outer ring over the catalogue-listed axial-displacement range (s), so shaft thermal growth disappears as thrust rather than preloading the 1700 mm seat. Selection arithmetic: C 24000 kN against C0 62000 kN gives a C0/C ratio of 2.58, and the 3000 kN fatigue load limit Pu sets the contamination-adjusted life floor. Open executions accept relubrication — route it through the outer-ring groove on sizes that have one and purge stale grease at service intervals. Grease through the annular groove features where provided; on open executions feed lubricant past the long roller set at assembly, since the 355 mm wide cavity does not fill itself.",
    "applications": [
      "paper machine drying cylinders and calender rolls with long, thermally expanding shafts",
      "continuous-caster guide rolls and slab-caster segments under heat growth",
      "vibrating screen exciters fitted with the VE240 tolerance execution",
      "long fan and kiln main shafts where the free end must float without thrust load"
    ],
    "failure_modes": [
      "roller-end and flange smearing after lubricant starvation at the long roller contacts",
      "roller skew and cage damage after the bearing is clamped solid between shaft and housing shoulders",
      "PA66 cage (TN9) softening when the sustained temperature passes the polymer limit",
      "condensation pitting in machines that run intermittently in humid environments",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips"
    ],
    "pitfalls": [
      "At 1700 mm bore the 3510 kg mass and 355 mm width make seating geometry dominant: sphered-washer seats and oil flow must be verified in place, not just on the drawing.",
      "Tapered-bore K executions mount on adapter sleeves (1:12) and K30 on withdrawal sleeves (1:30) — the 1700 mm bore changes the sleeve family, and the drive-up procedure differs accordingly.",
      "Reference and limiting speeds are different limits: the 110 r/min reference speed is the thermal criterion under load, the limiting value is the mechanical ceiling; observe the reference under load unless the arrangement calculation says otherwise.",
      "The quoted 24000/62000 kN ratings belong to this exact execution (C 39/1700 MB); VE240 vibrating-screen variants and sealed 2CS/2NS variants have their own figures even at the same envelope.",
      "Never use C 39/1700 MB as the locating bearing: it carries no axial load by design — the arrangement needs a separate locating spherical, tapered or angular bearing facing the thrust.",
      "The 24000/62000 kN ratings and 3510000 g mass are SKF catalogue values transcribed from ch. 10.1 of PUB BU/P1 17000 (PDF table page 868); mounting data — axial displacement (s) and seating details — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What fails first on a misapplied CARB bearing?",
        "a": "Blocking the designed axial float — clamping the free end or locating both shaft ends — turns thermal growth into edge loading and spalls the toroidal raceways. Cage damage and ordinary fatigue follow overload or dry running."
      },
      {
        "q": "Which dimensions does the C 39/1700 MB have?",
        "a": "A C 39/1700 MB measures 1700 mm bore × 2180 mm outside diameter × 355 mm width (66.929 × 85.827 × 13.976 in). From SKF catalogue PUB BU/P1 17000: dynamic C 24000 kN, static C0 62000 kN, fatigue limit Pu 3000 kN, reference speed 110 r/min, limiting speed 150 r/min, mass about 3510000 g."
      },
      {
        "q": "What does C 39/1700 MB mean in SKF part numbering?",
        "a": "C marks CARB; 39 the dimension series; the size code gives 1700 mm bore; MB is the execution (cylindrical bore for direct shaft fitting, machined inner-ring-guided brass cage (MB)). The envelope follows ISO 15 and matches spherical roller bearing outlines, but the functions differ."
      },
      {
        "q": "Why is C 39/1700 MB used opposite a spherical roller bearing?",
        "a": "The spherical bearing locates the shaft and takes thrust; the CARB bearing at the other end self-aligns but floats, absorbing thermal expansion without inducing axial load. The pair is standard on paper machine drying cylinders and long caster rolls."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "C39",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.1 CARB toroidal roller bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "C39-1700-MB",
      "C 39/1700 MB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81102-TN",
    "brand": "SKF",
    "manufacturer_designation": "81102 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 15,
    "D_mm": 28,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 11.2,
    "static_load_kN": 27,
    "fatigue_load_limit_kN": 2.45,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 24,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81102 TN as a separable thrust bearing: the 15 mm shaft washer (WS), the glass fibre reinforced PA66 TN cage holding short cylindrical rollers, and the 28 mm housing washer (GS) can be ordered and mounted individually. In 81102 TN, 811 fixes the 28 mm OD and 9 mm height; 02 selects the 15 mm seat, and the glass fibre reinforced PA66 TN cage is the only execution suffix on these rigid-washer bearings. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 9 mm height. Minimum axial load is explicit at factor A 5.80e-5: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Mounting: locate the shaft washer on the 15 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 28 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At a 15 mm seat the 9 mm stack is easy to over-clamp — a cover torqued solid removes all roller clearance; shim to the catalogue endplay and keep factor A 5.80e-5 as the floor.",
      "Factor A 5.80e-5 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81102 TN size.",
      "the 4,300 r/min reference speed is the thermal criterion under load, the 8,500 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 11.2/27 kN ratings and 24 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 81102 TN?",
        "a": "A 81102 TN measures 15 mm bore × 28 mm outside diameter × 9 mm width (0.591 × 1.102 × 0.354 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11.2 kN, static C0 27 kN, fatigue limit Pu 2.45 kN, reference speed 4,300 r/min, limiting speed 8,500 r/min, mass about 24 g. Raceway diameters Ea 16 mm / Eb 27 mm and minimum load factor A 5.80e-5 guide the seat design."
      },
      {
        "q": "How is the 81102 TN designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 02 encodes the 15 mm bore (code 02 = 15 mm); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81102 TN need a minimum axial load?",
        "a": "Below factor A 5.80e-5 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81102 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81102",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81102-TN",
      "81102 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81103-TN",
    "brand": "SKF",
    "manufacturer_designation": "81103 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 17,
    "D_mm": 30,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 12.2,
    "static_load_kN": 31.5,
    "fatigue_load_limit_kN": 2.85,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 27,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81103 TN as a separable thrust bearing: the 17 mm shaft washer (WS), the glass fibre reinforced PA66 TN cage holding short cylindrical rollers, and the 30 mm housing washer (GS) can be ordered and mounted individually. In 81103 TN, 811 fixes the 30 mm OD and 9 mm height; 03 selects the 17 mm seat, and the glass fibre reinforced PA66 TN cage is the only execution suffix on these rigid-washer bearings. Small sizes ship with glass-fibre PA66 TN cages for quiet, low-friction running; the 12.2 kN rating assumes oil or grease reaching the full washer face. Minimum axial load is explicit at factor A 7.90e-5: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 7.90e-5) is present without clamping the rollers.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At a 17 mm seat the 9 mm stack is easy to over-clamp — a cover torqued solid removes all roller clearance; shim to the catalogue endplay and keep factor A 7.90e-5 as the floor.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81103 TN need different minimum load and lubrication despite the shared 17×30 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81103 TN size.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "the 4,300 r/min reference speed is the thermal criterion under load, the 8,500 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 12.2/31.5 kN ratings and 27 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 81103 TN?",
        "a": "A 81103 TN measures 17 mm bore × 30 mm outside diameter × 9 mm width (0.669 × 1.181 × 0.354 in). From SKF catalogue PUB BU/P1 17000: dynamic C 12.2 kN, static C0 31.5 kN, fatigue limit Pu 2.85 kN, reference speed 4,300 r/min, limiting speed 8,500 r/min, mass about 27 g. Raceway diameters Ea 18 mm / Eb 29 mm and minimum load factor A 7.90e-5 guide the seat design."
      },
      {
        "q": "How is the 81103 TN designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 03 encodes the 17 mm bore (code 03 = 17 mm); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81103 TN need a minimum axial load?",
        "a": "Below factor A 7.90e-5 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81103 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81103",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81103-TN",
      "81103 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81104-TN",
    "brand": "SKF",
    "manufacturer_designation": "81104 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 20,
    "D_mm": 35,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 18.6,
    "static_load_kN": 48,
    "fatigue_load_limit_kN": 4.65,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 37,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81104 TN is a single-direction cylindrical roller thrust bearing to ISO 104 in the light 811 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 20×35×10 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81104 TN sits in the light 811 series. Small sizes ship with glass-fibre PA66 TN cages for quiet, low-friction running; the 18.6 kN rating assumes oil or grease reaching the full washer face. Selection arithmetic: C 18.6 kN against C0 48 kN gives a C0/C ratio of 2.58 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At a 20 mm seat the 10 mm stack is easy to over-clamp — a cover torqued solid removes all roller clearance; shim to the catalogue endplay and keep factor A 1.80e-4 as the floor.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81104 TN size.",
      "the 3,800 r/min reference speed is the thermal criterion under load, the 7,500 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 18.6/48 kN ratings assume flat, full-support washer seats; a housing face narrower than the 35 mm washer OD invalidates the rating through edge stress.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81104 TN need different minimum load and lubrication despite the shared 20×35 mm outline.",
      "The 18.6/48 kN ratings and 37 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What ruins a 81104 TN in service?",
        "a": "Unloaded running below factor A 1.80e-4 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 7,500 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81104 TN have?",
        "a": "A 81104 TN measures 20 mm bore × 35 mm outside diameter × 10 mm width (0.787 × 1.378 × 0.394 in). From SKF catalogue PUB BU/P1 17000: dynamic C 18.6 kN, static C0 48 kN, fatigue limit Pu 4.65 kN, reference speed 3,800 r/min, limiting speed 7,500 r/min, mass about 37 g. Raceway diameters Ea 21 mm / Eb 34 mm and minimum load factor A 1.80e-4 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81104 TN belongs to the light 811 series, 20×35×10 mm."
      },
      {
        "q": "Are the washers of 81104 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81104",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81104-TN",
      "81104 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81105-TN",
    "brand": "SKF",
    "manufacturer_designation": "81105 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 25,
    "D_mm": 42,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 25,
    "static_load_kN": 69.5,
    "fatigue_load_limit_kN": 6.8,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 53,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81105 TN is a single-direction cylindrical roller thrust bearing to ISO 104 in the light 811 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 25×42×11 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81105 TN sits in the light 811 series. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 11 mm height. Selection arithmetic: C 25 kN against C0 69.5 kN gives a C0/C ratio of 2.78 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: locate the shaft washer on the 25 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 42 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At a 25 mm seat the 11 mm stack is easy to over-clamp — a cover torqued solid removes all roller clearance; shim to the catalogue endplay and keep factor A 3.90e-4 as the floor.",
      "The 25/69.5 kN ratings assume flat, full-support washer seats; a housing face narrower than the 42 mm washer OD invalidates the rating through edge stress.",
      "Factor A 3.90e-4 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81105 TN need different minimum load and lubrication despite the shared 25×42 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81105 TN size.",
      "The 25/69.5 kN ratings and 53 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What ruins a 81105 TN in service?",
        "a": "Unloaded running below factor A 3.90e-4 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 6,300 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81105 TN have?",
        "a": "A 81105 TN measures 25 mm bore × 42 mm outside diameter × 11 mm width (0.984 × 1.654 × 0.433 in). From SKF catalogue PUB BU/P1 17000: dynamic C 25 kN, static C0 69.5 kN, fatigue limit Pu 6.8 kN, reference speed 3,200 r/min, limiting speed 6,300 r/min, mass about 53 g. Raceway diameters Ea 26 mm / Eb 41 mm and minimum load factor A 3.90e-4 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81105 TN belongs to the light 811 series, 25×42×11 mm."
      },
      {
        "q": "Are the washers of 81105 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81105",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81105-TN",
      "81105 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81106-TN",
    "brand": "SKF",
    "manufacturer_designation": "81106 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 30,
    "D_mm": 47,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 27,
    "static_load_kN": 78,
    "fatigue_load_limit_kN": 7.65,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 57,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a thrust ball bearing of the same envelope is exhausted, 81106 TN replaces the ball complement with cylindrical rollers: 30 mm bore, 47 mm OD, rated 78 kN static for steady hook and screw loads. The designation 81106 TN states 811 series, 30 mm bore, glass fibre reinforced PA66 TN cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 4.90e-4. One direction only: 81106 TN cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At a 30 mm seat the 11 mm stack is easy to over-clamp — a cover torqued solid removes all roller clearance; shim to the catalogue endplay and keep factor A 4.90e-4 as the floor.",
      "Factor A 4.90e-4 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81106 TN need different minimum load and lubrication despite the shared 30×47 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81106 TN size.",
      "The 27/78 kN ratings and 57 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How should a 81106 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 4.90e-4 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81106 TN?",
        "a": "A 81106 TN measures 30 mm bore × 47 mm outside diameter × 11 mm width (1.181 × 1.85 × 0.433 in). From SKF catalogue PUB BU/P1 17000: dynamic C 27 kN, static C0 78 kN, fatigue limit Pu 7.65 kN, reference speed 3,000 r/min, limiting speed 6,000 r/min, mass about 57 g. Raceway diameters Ea 31 mm / Eb 46 mm and minimum load factor A 4.90e-4 guide the seat design."
      },
      {
        "q": "How is the 81106 TN designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 06 encodes the 30 mm bore (code 06 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81106 TN need a minimum axial load?",
        "a": "Below factor A 4.90e-4 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81106",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81106-TN",
      "81106 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81206-TN",
    "brand": "SKF",
    "manufacturer_designation": "81206 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 30,
    "D_mm": 52,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 50,
    "static_load_kN": 134,
    "fatigue_load_limit_kN": 13.4,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 120,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 812 series bearing 81206 TN carries pure axial load at low to moderate speed: 50 kN dynamic and 134 kN static across a 30×52 mm washer pair, 16 mm overall height. The designation 81206 TN states 812 series, 30 mm bore, glass fibre reinforced PA66 TN cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. Minimum axial load is explicit at factor A 0.0014: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Mounting: locate the shaft washer on the 30 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 52 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At a 30 mm seat the 16 mm stack is easy to over-clamp — a cover torqued solid removes all roller clearance; shim to the catalogue endplay and keep factor A 0.0014 as the floor.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81206 TN need different minimum load and lubrication despite the shared 30×52 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81206 TN size.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "the 2,400 r/min reference speed is the thermal criterion under load, the 4,800 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 50/134 kN ratings and 120 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 81206 TN designation read?",
        "a": "The first three digits 812 give the dimension series (heavy 812 series); 06 encodes the 30 mm bore (code 06 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81206 TN need a minimum axial load?",
        "a": "Below factor A 0.0014 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81206 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81206 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.0014 minimum load is present."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81206",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81206-TN",
      "81206 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81107-TN",
    "brand": "SKF",
    "manufacturer_designation": "81107 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 35,
    "D_mm": 52,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 29,
    "static_load_kN": 93,
    "fatigue_load_limit_kN": 9.15,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 73,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81107 TN is the rigid-washer thrust solution for a 35 mm shaft: unlike ball thrust types, the line contact of cylindrical rollers gives 29 kN C within just 12 mm of axial space, per the ISO 104 plan. Reading the code: the first three digits 811 give the dimension series (light 811 series), the last two 07 encode the 35 mm shaft washer bore (code 07 × 5), and TN names the cage execution. Small sizes ship with glass-fibre PA66 TN cages for quiet, low-friction running; the 29 kN rating assumes oil or grease reaching the full washer face. Static safety matters for shock duty: compare peak axial force against C0 93 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 6.90e-4) is present without clamping the rollers.",
    "applications": [
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At a 35 mm seat the 12 mm stack is easy to over-clamp — a cover torqued solid removes all roller clearance; shim to the catalogue endplay and keep factor A 6.90e-4 as the floor.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81107 TN need different minimum load and lubrication despite the shared 35×52 mm outline.",
      "the 2,800 r/min reference speed is the thermal criterion under load, the 5,600 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 29/93 kN ratings assume flat, full-support washer seats; a housing face narrower than the 52 mm washer OD invalidates the rating through edge stress.",
      "The 29/93 kN ratings and 73 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What ruins a 81107 TN in service?",
        "a": "Unloaded running below factor A 6.90e-4 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 5,600 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81107 TN have?",
        "a": "A 81107 TN measures 35 mm bore × 52 mm outside diameter × 12 mm width (1.378 × 2.047 × 0.472 in). From SKF catalogue PUB BU/P1 17000: dynamic C 29 kN, static C0 93 kN, fatigue limit Pu 9.15 kN, reference speed 2,800 r/min, limiting speed 5,600 r/min, mass about 73 g. Raceway diameters Ea 36 mm / Eb 51 mm and minimum load factor A 6.90e-4 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81107 TN belongs to the light 811 series, 35×52×12 mm."
      },
      {
        "q": "Are the washers of 81107 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81107",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81107-TN",
      "81107 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81207-TN",
    "brand": "SKF",
    "manufacturer_designation": "81207 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 35,
    "D_mm": 62,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 62,
    "static_load_kN": 190,
    "fatigue_load_limit_kN": 19.3,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 210,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81207 TN as a separable thrust bearing: the 35 mm shaft washer (WS), the glass fibre reinforced PA66 TN cage holding short cylindrical rollers, and the 62 mm housing washer (GS) can be ordered and mounted individually. The designation 81207 TN states 812 series, 35 mm bore, glass fibre reinforced PA66 TN cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 18 mm height. Minimum axial load is explicit at factor A 0.0029: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At a 35 mm seat the 18 mm stack is easy to over-clamp — a cover torqued solid removes all roller clearance; shim to the catalogue endplay and keep factor A 0.0029 as the floor.",
      "the 2,000 r/min reference speed is the thermal criterion under load, the 4,000 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 62/190 kN ratings assume flat, full-support washer seats; a housing face narrower than the 62 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.0029 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81207 TN need different minimum load and lubrication despite the shared 35×62 mm outline.",
      "The 62/190 kN ratings and 210 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 81207 TN designation read?",
        "a": "The first three digits 812 give the dimension series (heavy 812 series); 07 encodes the 35 mm bore (code 07 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81207 TN need a minimum axial load?",
        "a": "Below factor A 0.0029 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81207 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81207 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.0029 minimum load is present."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81207",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81207-TN",
      "81207 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81108-TN",
    "brand": "SKF",
    "manufacturer_designation": "81108 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 40,
    "D_mm": 60,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 43,
    "static_load_kN": 137,
    "fatigue_load_limit_kN": 13.7,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81108 TN is the rigid-washer thrust solution for a 40 mm shaft: unlike ball thrust types, the line contact of cylindrical rollers gives 43 kN C within just 13 mm of axial space, per the ISO 104 plan. Reading the code: the first three digits 811 give the dimension series (light 811 series), the last two 08 encode the 40 mm shaft washer bore (code 08 × 5), and TN names the cage execution. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 13 mm height. Static safety matters for shock duty: compare peak axial force against C0 137 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At a 40 mm seat the 13 mm stack is easy to over-clamp — a cover torqued solid removes all roller clearance; shim to the catalogue endplay and keep factor A 0.0015 as the floor.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81108 TN size.",
      "the 2,400 r/min reference speed is the thermal criterion under load, the 5,000 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81108 TN need different minimum load and lubrication despite the shared 40×60 mm outline.",
      "The 43/137 kN ratings assume flat, full-support washer seats; a housing face narrower than the 60 mm washer OD invalidates the rating through edge stress.",
      "The 43/137 kN ratings and 110 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What ruins a 81108 TN in service?",
        "a": "Unloaded running below factor A 0.0015 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 5,000 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81108 TN have?",
        "a": "A 81108 TN measures 40 mm bore × 60 mm outside diameter × 13 mm width (1.575 × 2.362 × 0.512 in). From SKF catalogue PUB BU/P1 17000: dynamic C 43 kN, static C0 137 kN, fatigue limit Pu 13.7 kN, reference speed 2,400 r/min, limiting speed 5,000 r/min, mass about 110 g. Raceway diameters Ea 42 mm / Eb 58 mm and minimum load factor A 0.0015 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81108 TN belongs to the light 811 series, 40×60×13 mm."
      },
      {
        "q": "Are the washers of 81108 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81108",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81108-TN",
      "81108 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81208-TN",
    "brand": "SKF",
    "manufacturer_designation": "81208 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 40,
    "D_mm": 68,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 83,
    "static_load_kN": 255,
    "fatigue_load_limit_kN": 26.5,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81208 TN as a separable thrust bearing: the 40 mm shaft washer (WS), the glass fibre reinforced PA66 TN cage holding short cylindrical rollers, and the 68 mm housing washer (GS) can be ordered and mounted individually. Reading the code: the first three digits 812 give the dimension series (heavy 812 series), the last two 08 encode the 40 mm shaft washer bore (code 08 × 5), and TN names the cage execution. Small sizes ship with glass-fibre PA66 TN cages for quiet, low-friction running; the 83 kN rating assumes oil or grease reaching the full washer face. Speed planning separates the 1,900 r/min thermal reference from the 3,800 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: locate the shaft washer on the 40 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 68 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At a 40 mm seat the 19 mm stack is easy to over-clamp — a cover torqued solid removes all roller clearance; shim to the catalogue endplay and keep factor A 0.0052 as the floor.",
      "The 83/255 kN ratings assume flat, full-support washer seats; a housing face narrower than the 68 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.0052 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81208 TN size.",
      "the 1,900 r/min reference speed is the thermal criterion under load, the 3,800 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 83/255 kN ratings and 250 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81208 TN belongs to the heavy 812 series, 40×68×19 mm."
      },
      {
        "q": "Are the washers of 81208 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81208 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81208 TN in service?",
        "a": "Unloaded running below factor A 0.0052 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 3,800 r/min limiting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81208",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81208-TN",
      "81208 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89308-TN",
    "brand": "SKF",
    "manufacturer_designation": "89308 TN",
    "series": "89300-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 40,
    "D_mm": 78,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 95,
    "static_load_kN": 365,
    "fatigue_load_limit_kN": 36.5,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 480,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "89308 TN is the rigid-washer thrust solution for a 40 mm shaft: unlike ball thrust types, the line contact of cylindrical rollers gives 95 kN C within just 22 mm of axial space, per the ISO 104 plan. In 89308 TN, 893 fixes the 78 mm OD and 22 mm height; 08 selects the 40 mm seat, and the glass fibre reinforced PA66 TN cage is the only execution suffix on these rigid-washer bearings. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 22 mm height. Speed planning separates the 2,000 r/min thermal reference from the 4,000 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: locate the shaft washer on the 40 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 78 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At a 40 mm seat the 22 mm stack is easy to over-clamp — a cover torqued solid removes all roller clearance; shim to the catalogue endplay and keep factor A 0.011 as the floor.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89308 TN need different minimum load and lubrication despite the shared 40×78 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 89308 TN size.",
      "Factor A 0.011 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The 95/365 kN ratings and 480 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 89308 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 89308 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.011 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 89308 TN?",
        "a": "A 89308 TN measures 40 mm bore × 78 mm outside diameter × 22 mm width (1.575 × 3.071 × 0.866 in). From SKF catalogue PUB BU/P1 17000: dynamic C 95 kN, static C0 365 kN, fatigue limit Pu 36.5 kN, reference speed 2,000 r/min, limiting speed 4,000 r/min, mass about 480 g. Raceway diameters Ea 44 mm / Eb 77 mm and minimum load factor A 0.011 guide the seat design."
      },
      {
        "q": "How is the 89308 TN designation read?",
        "a": "The first three digits 893 give the dimension series (heavy 893 series); 08 encodes the 40 mm bore (code 08 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89308",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89308-TN",
      "89308 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81109-TN",
    "brand": "SKF",
    "manufacturer_designation": "81109 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 45,
    "D_mm": 65,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 45,
    "static_load_kN": 153,
    "fatigue_load_limit_kN": 15.3,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 81109 TN denotes a cylindrical roller thrust bearing whose rollers run flat on hardened, ground washers — no radial capacity, one axial direction only, and a minimum axial load of factor A 0.0019. In 81109 TN, 811 fixes the 65 mm OD and 14 mm height; 09 selects the 45 mm seat, and the glass fibre reinforced PA66 TN cage is the only execution suffix on these rigid-washer bearings. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.0019. The 130 g mass and 14 mm axial height sit between 45 and 65 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.0019) is present without clamping the rollers.",
    "applications": [
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 45 mm bore the minimum load (A 0.0019) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "the 2,200 r/min reference speed is the thermal criterion under load, the 4,500 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 45/153 kN ratings assume flat, full-support washer seats; a housing face narrower than the 65 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.0019 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The 45/153 kN ratings and 130 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How should a 81109 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.0019 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81109 TN?",
        "a": "A 81109 TN measures 45 mm bore × 65 mm outside diameter × 14 mm width (1.772 × 2.559 × 0.551 in). From SKF catalogue PUB BU/P1 17000: dynamic C 45 kN, static C0 153 kN, fatigue limit Pu 15.3 kN, reference speed 2,200 r/min, limiting speed 4,500 r/min, mass about 130 g. Raceway diameters Ea 47 mm / Eb 63 mm and minimum load factor A 0.0019 guide the seat design."
      },
      {
        "q": "How is the 81109 TN designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 09 encodes the 45 mm bore (code 09 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81109 TN need a minimum axial load?",
        "a": "Below factor A 0.0019 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81109",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81109-TN",
      "81109 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81209-TN",
    "brand": "SKF",
    "manufacturer_designation": "81209 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 45,
    "D_mm": 73,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 83,
    "static_load_kN": 255,
    "fatigue_load_limit_kN": 26.5,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81209 TN is a single-direction cylindrical roller thrust bearing to ISO 104 in the heavy 812 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 45×73×20 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. Reading the code: the first three digits 812 give the dimension series (heavy 812 series), the last two 09 encode the 45 mm shaft washer bore (code 09 × 5), and TN names the cage execution. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. Speed planning separates the 1,800 r/min thermal reference from the 3,600 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 45 mm bore the minimum load (A 0.0052) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81209 TN need different minimum load and lubrication despite the shared 45×73 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81209 TN size.",
      "the 1,800 r/min reference speed is the thermal criterion under load, the 3,600 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 83/255 kN ratings and 290 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81209 TN belongs to the heavy 812 series, 45×73×20 mm."
      },
      {
        "q": "Are the washers of 81209 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81209 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81209 TN in service?",
        "a": "Unloaded running below factor A 0.0052 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 3,600 r/min limiting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81209",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81209-TN",
      "81209 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81110-TN",
    "brand": "SKF",
    "manufacturer_designation": "81110 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 50,
    "D_mm": 70,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 47.5,
    "static_load_kN": 166,
    "fatigue_load_limit_kN": 16.6,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81110 TN as a separable thrust bearing: the 50 mm shaft washer (WS), the glass fibre reinforced PA66 TN cage holding short cylindrical rollers, and the 70 mm housing washer (GS) can be ordered and mounted individually. The designation 81110 TN states 811 series, 50 mm bore, glass fibre reinforced PA66 TN cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. Speed planning separates the 2,200 r/min thermal reference from the 4,300 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: locate the shaft washer on the 50 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 70 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 50 mm bore the minimum load (A 0.0022) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81110 TN need different minimum load and lubrication despite the shared 50×70 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81110 TN size.",
      "Factor A 0.0022 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The 47.5/166 kN ratings and 140 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 81110 TN designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 10 encodes the 50 mm bore (code 10 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81110 TN need a minimum axial load?",
        "a": "Below factor A 0.0022 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81110 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81110 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.0022 minimum load is present."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81110",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81110-TN",
      "81110 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81210-TN",
    "brand": "SKF",
    "manufacturer_designation": "81210 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 50,
    "D_mm": 78,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 91.5,
    "static_load_kN": 300,
    "fatigue_load_limit_kN": 31,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 360,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81210 TN is the rigid-washer thrust solution for a 50 mm shaft: unlike ball thrust types, the line contact of cylindrical rollers gives 91.5 kN C within just 22 mm of axial space, per the ISO 104 plan. The designation 81210 TN states 812 series, 50 mm bore, glass fibre reinforced PA66 TN cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.0072. Static safety matters for shock duty: compare peak axial force against C0 300 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.0072) is present without clamping the rollers.",
    "applications": [
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 50 mm bore the minimum load (A 0.0072) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "the 1,700 r/min reference speed is the thermal criterion under load, the 3,400 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 91.5/300 kN ratings assume flat, full-support washer seats; a housing face narrower than the 78 mm washer OD invalidates the rating through edge stress.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81210 TN need different minimum load and lubrication despite the shared 50×78 mm outline.",
      "The 91.5/300 kN ratings and 360 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 81210 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81210 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.0072 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81210 TN?",
        "a": "A 81210 TN measures 50 mm bore × 78 mm outside diameter × 22 mm width (1.969 × 3.071 × 0.866 in). From SKF catalogue PUB BU/P1 17000: dynamic C 91.5 kN, static C0 300 kN, fatigue limit Pu 31 kN, reference speed 1,700 r/min, limiting speed 3,400 r/min, mass about 360 g. Raceway diameters Ea 53 mm / Eb 75 mm and minimum load factor A 0.0072 guide the seat design."
      },
      {
        "q": "How is the 81210 TN designation read?",
        "a": "The first three digits 812 give the dimension series (heavy 812 series); 10 encodes the 50 mm bore (code 10 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81210",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81210-TN",
      "81210 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81111-TN",
    "brand": "SKF",
    "manufacturer_designation": "81111 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 55,
    "D_mm": 78,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 285,
    "fatigue_load_limit_kN": 29,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81111 TN is a single-direction cylindrical roller thrust bearing to ISO 104 in the light 811 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 55×78×16 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. Reading the code: the first three digits 811 give the dimension series (light 811 series), the last two 11 encode the 55 mm shaft washer bore (code 11 × 5), and TN names the cage execution. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 16 mm height. Selection arithmetic: C 69.5 kN against C0 285 kN gives a C0/C ratio of 4.10 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 55 mm bore the minimum load (A 0.0065) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81111 TN size.",
      "the 1,900 r/min reference speed is the thermal criterion under load, the 3,800 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 69.5/285 kN ratings assume flat, full-support washer seats; a housing face narrower than the 78 mm washer OD invalidates the rating through edge stress.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81111 TN need different minimum load and lubrication despite the shared 55×78 mm outline.",
      "The 69.5/285 kN ratings and 230 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81111 TN belongs to the light 811 series, 55×78×16 mm."
      },
      {
        "q": "Are the washers of 81111 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81111 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81111 TN in service?",
        "a": "Unloaded running below factor A 0.0065 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 3,800 r/min limiting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81111",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81111-TN",
      "81111 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81211-TN",
    "brand": "SKF",
    "manufacturer_designation": "81211 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 55,
    "D_mm": 90,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 122,
    "static_load_kN": 390,
    "fatigue_load_limit_kN": 40,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 81211 TN denotes a cylindrical roller thrust bearing whose rollers run flat on hardened, ground washers — no radial capacity, one axial direction only, and a minimum axial load of factor A 0.012. The designation 81211 TN states 812 series, 55 mm bore, glass fibre reinforced PA66 TN cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 122 kN rating assumes oil or grease reaching the full washer face. Static safety matters for shock duty: compare peak axial force against C0 390 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: locate the shaft washer on the 55 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 90 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 55 mm bore the minimum load (A 0.012) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Factor A 0.012 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The 122/390 kN ratings assume flat, full-support washer seats; a housing face narrower than the 90 mm washer OD invalidates the rating through edge stress.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81211 TN need different minimum load and lubrication despite the shared 55×90 mm outline.",
      "The 122/390 kN ratings and 570 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 81211 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81211 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.012 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81211 TN?",
        "a": "A 81211 TN measures 55 mm bore × 90 mm outside diameter × 25 mm width (2.165 × 3.543 × 0.984 in). From SKF catalogue PUB BU/P1 17000: dynamic C 122 kN, static C0 390 kN, fatigue limit Pu 40 kN, reference speed 1,400 r/min, limiting speed 2,800 r/min, mass about 570 g. Raceway diameters Ea 59 mm / Eb 85 mm and minimum load factor A 0.012 guide the seat design."
      },
      {
        "q": "How is the 81211 TN designation read?",
        "a": "The first three digits 812 give the dimension series (heavy 812 series); 11 encodes the 55 mm bore (code 11 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81211",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81211-TN",
      "81211 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81112-TN",
    "brand": "SKF",
    "manufacturer_designation": "81112 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 60,
    "D_mm": 85,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 80,
    "static_load_kN": 300,
    "fatigue_load_limit_kN": 30.5,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 270,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81112 TN is a single-direction cylindrical roller thrust bearing to ISO 104 in the light 811 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 60×85×17 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. Reading the code: the first three digits 811 give the dimension series (light 811 series), the last two 12 encode the 60 mm shaft washer bore (code 12 × 5), and TN names the cage execution. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 80 kN rating assumes oil or grease reaching the full washer face. Selection arithmetic: C 80 kN against C0 300 kN gives a C0/C ratio of 3.75 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: locate the shaft washer on the 60 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 85 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 60 mm bore the minimum load (A 0.0072) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "The 80/300 kN ratings assume flat, full-support washer seats; a housing face narrower than the 85 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.0072 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81112 TN need different minimum load and lubrication despite the shared 60×85 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81112 TN size.",
      "The 80/300 kN ratings and 270 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81112 TN belongs to the light 811 series, 60×85×17 mm."
      },
      {
        "q": "Are the washers of 81112 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81112 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81112 TN in service?",
        "a": "Unloaded running below factor A 0.0072 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 3,600 r/min limiting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81112",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81112-TN",
      "81112 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81212-TN",
    "brand": "SKF",
    "manufacturer_designation": "81212 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 60,
    "D_mm": 95,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 137,
    "static_load_kN": 465,
    "fatigue_load_limit_kN": 47.5,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 812 series bearing 81212 TN carries pure axial load at low to moderate speed: 137 kN dynamic and 465 kN static across a 60×95 mm washer pair, 26 mm overall height. Reading the code: the first three digits 812 give the dimension series (heavy 812 series), the last two 12 encode the 60 mm shaft washer bore (code 12 × 5), and TN names the cage execution. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. The 650 g mass and 26 mm axial height sit between 60 and 95 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 60 mm bore the minimum load (A 0.017) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81212 TN need different minimum load and lubrication despite the shared 60×95 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81212 TN size.",
      "the 1,400 r/min reference speed is the thermal criterion under load, the 2,800 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 137/465 kN ratings and 650 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a thrust ball bearing replace the 81212 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81212 TN in service?",
        "a": "Unloaded running below factor A 0.017 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 2,800 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81212 TN have?",
        "a": "A 81212 TN measures 60 mm bore × 95 mm outside diameter × 26 mm width (2.362 × 3.74 × 1.024 in). From SKF catalogue PUB BU/P1 17000: dynamic C 137 kN, static C0 465 kN, fatigue limit Pu 47.5 kN, reference speed 1,400 r/min, limiting speed 2,800 r/min, mass about 650 g. Raceway diameters Ea 64 mm / Eb 91 mm and minimum load factor A 0.017 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81212 TN belongs to the heavy 812 series, 60×95×26 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81212",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81212-TN",
      "81212 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89312-TN",
    "brand": "SKF",
    "manufacturer_designation": "89312 TN",
    "series": "89300-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 153,
    "static_load_kN": 640,
    "fatigue_load_limit_kN": 65.5,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 1250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "89312 TN is a single-direction cylindrical roller thrust bearing to ISO 104 in the heavy 893 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 60×110×30 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. In 89312 TN, 893 fixes the 110 mm OD and 30 mm height; 12 selects the 60 mm seat, and the glass fibre reinforced PA66 TN cage is the only execution suffix on these rigid-washer bearings. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 153 kN rating assumes oil or grease reaching the full washer face. The 1250 g mass and 30 mm axial height sit between 60 and 110 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.033) is present without clamping the rollers.",
    "applications": [
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 60 mm bore the minimum load (A 0.033) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "the 1,400 r/min reference speed is the thermal criterion under load, the 2,800 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 153/640 kN ratings assume flat, full-support washer seats; a housing face narrower than the 110 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.033 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The 153/640 kN ratings and 1250 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 89312 TN?",
        "a": "A 89312 TN measures 60 mm bore × 110 mm outside diameter × 30 mm width (2.362 × 4.331 × 1.181 in). From SKF catalogue PUB BU/P1 17000: dynamic C 153 kN, static C0 640 kN, fatigue limit Pu 65.5 kN, reference speed 1,400 r/min, limiting speed 2,800 r/min, mass about 1250 g. Raceway diameters Ea 66 mm / Eb 108 mm and minimum load factor A 0.033 guide the seat design."
      },
      {
        "q": "How is the 89312 TN designation read?",
        "a": "The first three digits 893 give the dimension series (heavy 893 series); 12 encodes the 60 mm bore (code 12 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 89312 TN need a minimum axial load?",
        "a": "Below factor A 0.033 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 89312 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89312",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89312-TN",
      "89312 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81113-TN",
    "brand": "SKF",
    "manufacturer_designation": "81113 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 65,
    "D_mm": 90,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 83,
    "static_load_kN": 320,
    "fatigue_load_limit_kN": 32.5,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a thrust ball bearing of the same envelope is exhausted, 81113 TN replaces the ball complement with cylindrical rollers: 65 mm bore, 90 mm OD, rated 320 kN static for steady hook and screw loads. In 81113 TN, 811 fixes the 90 mm OD and 18 mm height; 13 selects the 65 mm seat, and the glass fibre reinforced PA66 TN cage is the only execution suffix on these rigid-washer bearings. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. One direction only: 81113 TN cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 65 mm bore the minimum load (A 0.0082) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Factor A 0.0082 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81113 TN need different minimum load and lubrication despite the shared 65×90 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81113 TN size.",
      "The 83/320 kN ratings and 310 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 81113 TN designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 13 encodes the 65 mm bore (code 13 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81113 TN need a minimum axial load?",
        "a": "Below factor A 0.0082 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81113 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81113 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.0082 minimum load is present."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81113",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81113-TN",
      "81113 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81213-TN",
    "brand": "SKF",
    "manufacturer_designation": "81213 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 65,
    "D_mm": 100,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 140,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 50,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 812 series bearing 81213 TN carries pure axial load at low to moderate speed: 140 kN dynamic and 490 kN static across a 65×100 mm washer pair, 27 mm overall height. Reading the code: the first three digits 812 give the dimension series (heavy 812 series), the last two 13 encode the 65 mm shaft washer bore (code 13 × 5), and TN names the cage execution. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.019. The 720 g mass and 27 mm axial height sit between 65 and 100 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: locate the shaft washer on the 65 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 100 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 65 mm bore the minimum load (A 0.019) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81213 TN size.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,600 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81213 TN need different minimum load and lubrication despite the shared 65×100 mm outline.",
      "The 140/490 kN ratings and 720 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a thrust ball bearing replace the 81213 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81213 TN in service?",
        "a": "Unloaded running below factor A 0.019 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 2,600 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81213 TN have?",
        "a": "A 81213 TN measures 65 mm bore × 100 mm outside diameter × 27 mm width (2.559 × 3.937 × 1.063 in). From SKF catalogue PUB BU/P1 17000: dynamic C 140 kN, static C0 490 kN, fatigue limit Pu 50 kN, reference speed 1,300 r/min, limiting speed 2,600 r/min, mass about 720 g. Raceway diameters Ea 69 mm / Eb 96 mm and minimum load factor A 0.019 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81213 TN belongs to the heavy 812 series, 65×100×27 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81213",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81213-TN",
      "81213 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89313-TN",
    "brand": "SKF",
    "manufacturer_designation": "89313 TN",
    "series": "89300-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 65,
    "D_mm": 115,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 153,
    "static_load_kN": 640,
    "fatigue_load_limit_kN": 65.5,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 1350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a thrust ball bearing of the same envelope is exhausted, 89313 TN replaces the ball complement with cylindrical rollers: 65 mm bore, 115 mm OD, rated 640 kN static for steady hook and screw loads. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 89313 TN sits in the heavy 893 series. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. Minimum axial load is explicit at factor A 0.033: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Mounting: locate the shaft washer on the 65 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 115 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 65 mm bore the minimum load (A 0.033) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "The 153/640 kN ratings assume flat, full-support washer seats; a housing face narrower than the 115 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.033 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "the 1,400 r/min reference speed is the thermal criterion under load, the 2,800 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89313 TN need different minimum load and lubrication despite the shared 65×115 mm outline.",
      "The 153/640 kN ratings and 1350 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 89313 TN have?",
        "a": "A 89313 TN measures 65 mm bore × 115 mm outside diameter × 30 mm width (2.559 × 4.528 × 1.181 in). From SKF catalogue PUB BU/P1 17000: dynamic C 153 kN, static C0 640 kN, fatigue limit Pu 65.5 kN, reference speed 1,400 r/min, limiting speed 2,800 r/min, mass about 1350 g. Raceway diameters Ea 71 mm / Eb 113 mm and minimum load factor A 0.033 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 89313 TN belongs to the heavy 893 series, 65×115×30 mm."
      },
      {
        "q": "Are the washers of 89313 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 89313 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89313",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89313-TN",
      "89313 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81114-TN",
    "brand": "SKF",
    "manufacturer_designation": "81114 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 70,
    "D_mm": 95,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 86.5,
    "static_load_kN": 345,
    "fatigue_load_limit_kN": 34.5,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 330,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81114 TN is the rigid-washer thrust solution for a 70 mm shaft: unlike ball thrust types, the line contact of cylindrical rollers gives 86.5 kN C within just 18 mm of axial space, per the ISO 104 plan. In 81114 TN, 811 fixes the 95 mm OD and 18 mm height; 14 selects the 70 mm seat, and the glass fibre reinforced PA66 TN cage is the only execution suffix on these rigid-washer bearings. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. Static safety matters for shock duty: compare peak axial force against C0 345 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: locate the shaft washer on the 70 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 95 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 70 mm bore the minimum load (A 0.0095) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81114 TN need different minimum load and lubrication despite the shared 70×95 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81114 TN size.",
      "the 1,700 r/min reference speed is the thermal criterion under load, the 3,400 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 86.5/345 kN ratings assume flat, full-support washer seats; a housing face narrower than the 95 mm washer OD invalidates the rating through edge stress.",
      "The 86.5/345 kN ratings and 330 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 81114 TN?",
        "a": "A 81114 TN measures 70 mm bore × 95 mm outside diameter × 18 mm width (2.756 × 3.74 × 0.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 86.5 kN, static C0 345 kN, fatigue limit Pu 34.5 kN, reference speed 1,700 r/min, limiting speed 3,400 r/min, mass about 330 g. Raceway diameters Ea 72 mm / Eb 92 mm and minimum load factor A 0.0095 guide the seat design."
      },
      {
        "q": "How is the 81114 TN designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 14 encodes the 70 mm bore (code 14 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81114 TN need a minimum axial load?",
        "a": "Below factor A 0.0095 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81114 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81114",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81114-TN",
      "81114 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81214-TN",
    "brand": "SKF",
    "manufacturer_designation": "81214 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 70,
    "D_mm": 105,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 146,
    "static_load_kN": 530,
    "fatigue_load_limit_kN": 55,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 770,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81214 TN as a separable thrust bearing: the 70 mm shaft washer (WS), the glass fibre reinforced PA66 TN cage holding short cylindrical rollers, and the 105 mm housing washer (GS) can be ordered and mounted individually. In 81214 TN, 812 fixes the 105 mm OD and 27 mm height; 14 selects the 70 mm seat, and the glass fibre reinforced PA66 TN cage is the only execution suffix on these rigid-washer bearings. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 146 kN rating assumes oil or grease reaching the full washer face. Minimum axial load is explicit at factor A 0.022: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 70 mm bore the minimum load (A 0.022) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,600 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 146/530 kN ratings assume flat, full-support washer seats; a housing face narrower than the 105 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.022 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81214 TN need different minimum load and lubrication despite the shared 70×105 mm outline.",
      "The 146/530 kN ratings and 770 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 81214 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81214 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.022 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81214 TN?",
        "a": "A 81214 TN measures 70 mm bore × 105 mm outside diameter × 27 mm width (2.756 × 4.134 × 1.063 in). From SKF catalogue PUB BU/P1 17000: dynamic C 146 kN, static C0 530 kN, fatigue limit Pu 55 kN, reference speed 1,300 r/min, limiting speed 2,600 r/min, mass about 770 g. Raceway diameters Ea 74 mm / Eb 102 mm and minimum load factor A 0.022 guide the seat design."
      },
      {
        "q": "How is the 81214 TN designation read?",
        "a": "The first three digits 812 give the dimension series (heavy 812 series); 14 encodes the 70 mm bore (code 14 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81214",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81214-TN",
      "81214 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89314-TN",
    "brand": "SKF",
    "manufacturer_designation": "89314 TN",
    "series": "89300-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 186,
    "static_load_kN": 800,
    "fatigue_load_limit_kN": 81.5,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 1800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a thrust ball bearing of the same envelope is exhausted, 89314 TN replaces the ball complement with cylindrical rollers: 70 mm bore, 125 mm OD, rated 800 kN static for steady hook and screw loads. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 89314 TN sits in the heavy 893 series. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.05. Minimum axial load is explicit at factor A 0.05: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.05) is present without clamping the rollers.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 70 mm bore the minimum load (A 0.05) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89314 TN need different minimum load and lubrication despite the shared 70×125 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 89314 TN size.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,600 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 186/800 kN ratings and 1800 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 89314 TN have?",
        "a": "A 89314 TN measures 70 mm bore × 125 mm outside diameter × 34 mm width (2.756 × 4.921 × 1.339 in). From SKF catalogue PUB BU/P1 17000: dynamic C 186 kN, static C0 800 kN, fatigue limit Pu 81.5 kN, reference speed 1,300 r/min, limiting speed 2,600 r/min, mass about 1800 g. Raceway diameters Ea 76 mm / Eb 123 mm and minimum load factor A 0.05 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 89314 TN belongs to the heavy 893 series, 70×125×34 mm."
      },
      {
        "q": "Are the washers of 89314 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 89314 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89314",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89314-TN",
      "89314 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81115-TN",
    "brand": "SKF",
    "manufacturer_designation": "81115 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 75,
    "D_mm": 100,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 83,
    "static_load_kN": 335,
    "fatigue_load_limit_kN": 34,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "weight_g": 390,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81115 TN is the rigid-washer thrust solution for a 75 mm shaft: unlike ball thrust types, the line contact of cylindrical rollers gives 83 kN C within just 19 mm of axial space, per the ISO 104 plan. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81115 TN sits in the light 811 series. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.009. The 390 g mass and 19 mm axial height sit between 75 and 100 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.009) is present without clamping the rollers.",
    "applications": [
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 75 mm bore the minimum load (A 0.009) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81115 TN size.",
      "the 1,600 r/min reference speed is the thermal criterion under load, the 3,200 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81115 TN need different minimum load and lubrication despite the shared 75×100 mm outline.",
      "The 83/335 kN ratings and 390 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 81115 TN have?",
        "a": "A 81115 TN measures 75 mm bore × 100 mm outside diameter × 19 mm width (2.953 × 3.937 × 0.748 in). From SKF catalogue PUB BU/P1 17000: dynamic C 83 kN, static C0 335 kN, fatigue limit Pu 34 kN, reference speed 1,600 r/min, limiting speed 3,200 r/min, mass about 390 g. Raceway diameters Ea 78 mm / Eb 97 mm and minimum load factor A 0.009 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81115 TN belongs to the light 811 series, 75×100×19 mm."
      },
      {
        "q": "Are the washers of 81115 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81115 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81115",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81115-TN",
      "81115 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81215-TN",
    "brand": "SKF",
    "manufacturer_designation": "81215 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 75,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 137,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 50,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81215 TN as a separable thrust bearing: the 75 mm shaft washer (WS), the glass fibre reinforced PA66 TN cage holding short cylindrical rollers, and the 110 mm housing washer (GS) can be ordered and mounted individually. In 81215 TN, 812 fixes the 110 mm OD and 27 mm height; 15 selects the 75 mm seat, and the glass fibre reinforced PA66 TN cage is the only execution suffix on these rigid-washer bearings. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. Speed planning separates the 1,200 r/min thermal reference from the 2,400 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 75 mm bore the minimum load (A 0.019) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Factor A 0.019 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81215 TN need different minimum load and lubrication despite the shared 75×110 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81215 TN size.",
      "The 137/490 kN ratings and 800 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 890); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why does 81215 TN need a minimum axial load?",
        "a": "Below factor A 0.019 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81215 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81215 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.019 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81215 TN?",
        "a": "A 81215 TN measures 75 mm bore × 110 mm outside diameter × 27 mm width (2.953 × 4.331 × 1.063 in). From SKF catalogue PUB BU/P1 17000: dynamic C 137 kN, static C0 490 kN, fatigue limit Pu 50 kN, reference speed 1,200 r/min, limiting speed 2,400 r/min, mass about 800 g. Raceway diameters Ea 79 mm / Eb 106 mm and minimum load factor A 0.019 guide the seat design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81215",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81215-TN",
      "81215 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81116-TN",
    "brand": "SKF",
    "manufacturer_designation": "81116 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 80,
    "D_mm": 105,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 81.5,
    "static_load_kN": 335,
    "fatigue_load_limit_kN": 34,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "weight_g": 400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 81116 TN denotes a cylindrical roller thrust bearing whose rollers run flat on hardened, ground washers — no radial capacity, one axial direction only, and a minimum axial load of factor A 0.009. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81116 TN sits in the light 811 series. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 81.5 kN rating assumes oil or grease reaching the full washer face. The 400 g mass and 19 mm axial height sit between 80 and 105 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: locate the shaft washer on the 80 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 105 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 80 mm bore the minimum load (A 0.009) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "The 81.5/335 kN ratings assume flat, full-support washer seats; a housing face narrower than the 105 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.009 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81116 TN need different minimum load and lubrication despite the shared 80×105 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81116 TN size.",
      "The 81.5/335 kN ratings and 400 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 81116 TN have?",
        "a": "A 81116 TN measures 80 mm bore × 105 mm outside diameter × 19 mm width (3.15 × 4.134 × 0.748 in). From SKF catalogue PUB BU/P1 17000: dynamic C 81.5 kN, static C0 335 kN, fatigue limit Pu 34 kN, reference speed 1,500 r/min, limiting speed 3,000 r/min, mass about 400 g. Raceway diameters Ea 83 mm / Eb 102 mm and minimum load factor A 0.009 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81116 TN belongs to the light 811 series, 80×105×19 mm."
      },
      {
        "q": "Are the washers of 81116 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81116 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81116",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81116-TN",
      "81116 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81216-TN",
    "brand": "SKF",
    "manufacturer_designation": "81216 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 80,
    "D_mm": 115,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 160,
    "static_load_kN": 610,
    "fatigue_load_limit_kN": 63,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81216 TN is a single-direction cylindrical roller thrust bearing to ISO 104 in the heavy 812 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 80×115×28 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81216 TN sits in the heavy 812 series. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 28 mm height. Selection arithmetic: C 160 kN against C0 610 kN gives a C0/C ratio of 3.81 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.03) is present without clamping the rollers.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 80 mm bore the minimum load (A 0.03) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81216 TN need different minimum load and lubrication despite the shared 80×115 mm outline.",
      "Factor A 0.03 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81216 TN size.",
      "The 160/610 kN ratings and 900 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Are the washers of 81216 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81216 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81216 TN in service?",
        "a": "Unloaded running below factor A 0.03 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 2,400 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81216 TN have?",
        "a": "A 81216 TN measures 80 mm bore × 115 mm outside diameter × 28 mm width (3.15 × 4.528 × 1.102 in). From SKF catalogue PUB BU/P1 17000: dynamic C 160 kN, static C0 610 kN, fatigue limit Pu 63 kN, reference speed 1,200 r/min, limiting speed 2,400 r/min, mass about 900 g. Raceway diameters Ea 84 mm / Eb 112 mm and minimum load factor A 0.03 guide the seat design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81216",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81216-TN",
      "81216 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89316-TN",
    "brand": "SKF",
    "manufacturer_designation": "89316 TN",
    "series": "89300-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 240,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 108,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 2350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 89316 TN denotes a cylindrical roller thrust bearing whose rollers run flat on hardened, ground washers — no radial capacity, one axial direction only, and a minimum axial load of factor A 0.09. Reading the code: the first three digits 893 give the dimension series (heavy 893 series), the last two 16 encode the 80 mm shaft washer bore (code 16 × 5), and TN names the cage execution. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. Selection arithmetic: C 240 kN against C0 1060 kN gives a C0/C ratio of 4.42 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 80 mm bore the minimum load (A 0.09) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 89316 TN size.",
      "the 1,200 r/min reference speed is the thermal criterion under load, the 2,400 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 240/1060 kN ratings assume flat, full-support washer seats; a housing face narrower than the 140 mm washer OD invalidates the rating through edge stress.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89316 TN need different minimum load and lubrication despite the shared 80×140 mm outline.",
      "The 240/1060 kN ratings and 2350 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 89316 TN have?",
        "a": "A 89316 TN measures 80 mm bore × 140 mm outside diameter × 36 mm width (3.15 × 5.512 × 1.417 in). From SKF catalogue PUB BU/P1 17000: dynamic C 240 kN, static C0 1060 kN, fatigue limit Pu 108 kN, reference speed 1,200 r/min, limiting speed 2,400 r/min, mass about 2350 g. Raceway diameters Ea 86 mm / Eb 137 mm and minimum load factor A 0.09 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 89316 TN belongs to the heavy 893 series, 80×140×36 mm."
      },
      {
        "q": "Are the washers of 89316 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 89316 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89316",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89316-TN",
      "89316 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89416-M",
    "brand": "SKF",
    "manufacturer_designation": "89416 M",
    "series": "89400-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 54,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 440,
    "static_load_kN": 1730,
    "fatigue_load_limit_kN": 173,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "weight_g": 7050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 89416 M denotes a cylindrical roller thrust bearing whose rollers run flat on hardened, ground washers — no radial capacity, one axial direction only, and a minimum axial load of factor A 0.24. Reading the code: the first three digits 894 give the dimension series (extra-heavy 894 series), the last two 16 encode the 80 mm shaft washer bore (code 16 × 5), and M names the cage execution. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.24. Selection arithmetic: C 440 kN against C0 1730 kN gives a C0/C ratio of 3.93 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: locate the shaft washer on the 80 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 170 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 80 mm bore the minimum load (A 0.24) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "The 440/1730 kN ratings assume flat, full-support washer seats; a housing face narrower than the 170 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.24 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89416 M need different minimum load and lubrication despite the shared 80×170 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 89416 M size.",
      "The 440/1730 kN ratings and 7050 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 89416 M have?",
        "a": "A 89416 M measures 80 mm bore × 170 mm outside diameter × 54 mm width (3.15 × 6.693 × 2.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 440 kN, static C0 1730 kN, fatigue limit Pu 173 kN, reference speed 900 r/min, limiting speed 1,800 r/min, mass about 7050 g. Raceway diameters Ea 88 mm / Eb 165 mm and minimum load factor A 0.24 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 89416 M belongs to the extra-heavy 894 series, 80×170×54 mm."
      },
      {
        "q": "Are the washers of 89416 M separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 89416 M?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89416",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89416-M",
      "89416 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81117-TN",
    "brand": "SKF",
    "manufacturer_designation": "81117 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 85,
    "D_mm": 110,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 88,
    "static_load_kN": 365,
    "fatigue_load_limit_kN": 37.5,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The light 811 series bearing 81117 TN carries pure axial load at low to moderate speed: 88 kN dynamic and 365 kN static across a 85×110 mm washer pair, 19 mm overall height. The designation 81117 TN states 811 series, 85 mm bore, glass fibre reinforced PA66 TN cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. Minimum axial load is explicit at factor A 0.011: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 85 mm bore the minimum load (A 0.011) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Factor A 0.011 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81117 TN size.",
      "the 1,500 r/min reference speed is the thermal criterion under load, the 3,000 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 88/365 kN ratings and 420 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 81117 TN?",
        "a": "A 81117 TN measures 85 mm bore × 110 mm outside diameter × 19 mm width (3.346 × 4.331 × 0.748 in). From SKF catalogue PUB BU/P1 17000: dynamic C 88 kN, static C0 365 kN, fatigue limit Pu 37.5 kN, reference speed 1,500 r/min, limiting speed 3,000 r/min, mass about 420 g. Raceway diameters Ea 87 mm / Eb 108 mm and minimum load factor A 0.011 guide the seat design."
      },
      {
        "q": "How is the 81117 TN designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 17 encodes the 85 mm bore (code 17 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81117 TN need a minimum axial load?",
        "a": "Below factor A 0.011 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81117 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81117",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81117-TN",
      "81117 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81217-TN",
    "brand": "SKF",
    "manufacturer_designation": "81217 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 85,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 170,
    "static_load_kN": 640,
    "fatigue_load_limit_kN": 67,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a thrust ball bearing of the same envelope is exhausted, 81217 TN replaces the ball complement with cylindrical rollers: 85 mm bore, 125 mm OD, rated 640 kN static for steady hook and screw loads. The designation 81217 TN states 812 series, 85 mm bore, glass fibre reinforced PA66 TN cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.033. One direction only: 81217 TN cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: locate the shaft washer on the 85 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 125 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 85 mm bore the minimum load (A 0.033) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81217 TN need different minimum load and lubrication despite the shared 85×125 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81217 TN size.",
      "the 1,100 r/min reference speed is the thermal criterion under load, the 2,200 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 170/640 kN ratings assume flat, full-support washer seats; a housing face narrower than the 125 mm washer OD invalidates the rating through edge stress.",
      "The 170/640 kN ratings and 1200 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why does 81217 TN need a minimum axial load?",
        "a": "Below factor A 0.033 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81217 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81217 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.033 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81217 TN?",
        "a": "A 81217 TN measures 85 mm bore × 125 mm outside diameter × 31 mm width (3.346 × 4.921 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 170 kN, static C0 640 kN, fatigue limit Pu 67 kN, reference speed 1,100 r/min, limiting speed 2,200 r/min, mass about 1200 g. Raceway diameters Ea 90 mm / Eb 119 mm and minimum load factor A 0.033 guide the seat design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81217",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81217-TN",
      "81217 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81118-TN",
    "brand": "SKF",
    "manufacturer_designation": "81118 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 90,
    "D_mm": 120,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 110,
    "static_load_kN": 450,
    "fatigue_load_limit_kN": 45.5,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The light 811 series bearing 81118 TN carries pure axial load at low to moderate speed: 110 kN dynamic and 450 kN static across a 90×120 mm washer pair, 22 mm overall height. Reading the code: the first three digits 811 give the dimension series (light 811 series), the last two 18 encode the 90 mm shaft washer bore (code 18 × 5), and TN names the cage execution. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.016. Speed planning separates the 1,300 r/min thermal reference from the 2,600 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: locate the shaft washer on the 90 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 120 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 90 mm bore the minimum load (A 0.016) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81118 TN need different minimum load and lubrication despite the shared 90×120 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81118 TN size.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,600 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 110/450 kN ratings and 620 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 81118 TN have?",
        "a": "A 81118 TN measures 90 mm bore × 120 mm outside diameter × 22 mm width (3.543 × 4.724 × 0.866 in). From SKF catalogue PUB BU/P1 17000: dynamic C 110 kN, static C0 450 kN, fatigue limit Pu 45.5 kN, reference speed 1,300 r/min, limiting speed 2,600 r/min, mass about 620 g. Raceway diameters Ea 93 mm / Eb 117 mm and minimum load factor A 0.016 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81118 TN belongs to the light 811 series, 90×120×22 mm."
      },
      {
        "q": "Are the washers of 81118 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81118 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81118",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81118-TN",
      "81118 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81218-TN",
    "brand": "SKF",
    "manufacturer_designation": "81218 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 90,
    "D_mm": 135,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 232,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 90,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a thrust ball bearing of the same envelope is exhausted, 81218 TN replaces the ball complement with cylindrical rollers: 90 mm bore, 135 mm OD, rated 865 kN static for steady hook and screw loads. The designation 81218 TN states 812 series, 90 mm bore, glass fibre reinforced PA66 TN cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. One direction only: 81218 TN cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.06) is present without clamping the rollers.",
    "applications": [
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 90 mm bore the minimum load (A 0.06) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "the 1,000 r/min reference speed is the thermal criterion under load, the 2,000 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 232/865 kN ratings assume flat, full-support washer seats; a housing face narrower than the 135 mm washer OD invalidates the rating through edge stress.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81218 TN need different minimum load and lubrication despite the shared 90×135 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81218 TN size.",
      "The 232/865 kN ratings and 1750 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why does 81218 TN need a minimum axial load?",
        "a": "Below factor A 0.06 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81218 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81218 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.06 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81218 TN?",
        "a": "A 81218 TN measures 90 mm bore × 135 mm outside diameter × 35 mm width (3.543 × 5.315 × 1.378 in). From SKF catalogue PUB BU/P1 17000: dynamic C 232 kN, static C0 865 kN, fatigue limit Pu 90 kN, reference speed 1,000 r/min, limiting speed 2,000 r/min, mass about 1750 g. Raceway diameters Ea 95 mm / Eb 129 mm and minimum load factor A 0.06 guide the seat design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81218",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81218-TN",
      "81218 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81120-TN",
    "brand": "SKF",
    "manufacturer_designation": "81120 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 100,
    "D_mm": 135,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 156,
    "static_load_kN": 630,
    "fatigue_load_limit_kN": 62,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a thrust ball bearing of the same envelope is exhausted, 81120 TN replaces the ball complement with cylindrical rollers: 100 mm bore, 135 mm OD, rated 630 kN static for steady hook and screw loads. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81120 TN sits in the light 811 series. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 25 mm height. One direction only: 81120 TN cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.032) is present without clamping the rollers.",
    "applications": [
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 100 mm bore the minimum load (A 0.032) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81120 TN need different minimum load and lubrication despite the shared 100×135 mm outline.",
      "The 156/630 kN ratings assume flat, full-support washer seats; a housing face narrower than the 135 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.032 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "The 156/630 kN ratings and 950 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Are the washers of 81120 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81120 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81120 TN in service?",
        "a": "Unloaded running below factor A 0.032 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 2,400 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81120 TN have?",
        "a": "A 81120 TN measures 100 mm bore × 135 mm outside diameter × 25 mm width (3.937 × 5.315 × 0.984 in). From SKF catalogue PUB BU/P1 17000: dynamic C 156 kN, static C0 630 kN, fatigue limit Pu 62 kN, reference speed 1,200 r/min, limiting speed 2,400 r/min, mass about 950 g. Raceway diameters Ea 104 mm / Eb 131 mm and minimum load factor A 0.032 guide the seat design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81120",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81120-TN",
      "81120 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81220-TN",
    "brand": "SKF",
    "manufacturer_designation": "81220 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 100,
    "D_mm": 150,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 270,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 104,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "weight_g": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 812 series bearing 81220 TN carries pure axial load at low to moderate speed: 270 kN dynamic and 1060 kN static across a 100×150 mm washer pair, 38 mm overall height. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81220 TN sits in the heavy 812 series. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 270 kN rating assumes oil or grease reaching the full washer face. Minimum axial load is explicit at factor A 0.09: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 100 mm bore the minimum load (A 0.09) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81220 TN size.",
      "the 900 r/min reference speed is the thermal criterion under load, the 1,800 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "Factor A 0.09 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The 270/1060 kN ratings and 2200 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What ruins a 81220 TN in service?",
        "a": "Unloaded running below factor A 0.09 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 1,800 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81220 TN have?",
        "a": "A 81220 TN measures 100 mm bore × 150 mm outside diameter × 38 mm width (3.937 × 5.906 × 1.496 in). From SKF catalogue PUB BU/P1 17000: dynamic C 270 kN, static C0 1060 kN, fatigue limit Pu 104 kN, reference speed 900 r/min, limiting speed 1,800 r/min, mass about 2200 g. Raceway diameters Ea 107 mm / Eb 142 mm and minimum load factor A 0.09 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81220 TN belongs to the heavy 812 series, 100×150×38 mm."
      },
      {
        "q": "Are the washers of 81220 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81220",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81220-TN",
      "81220 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89320-M",
    "brand": "SKF",
    "manufacturer_designation": "89320 M",
    "series": "89300-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 100,
    "D_mm": 170,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 300,
    "static_load_kN": 1370,
    "fatigue_load_limit_kN": 132,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "weight_g": 4550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a thrust ball bearing of the same envelope is exhausted, 89320 M replaces the ball complement with cylindrical rollers: 100 mm bore, 170 mm OD, rated 1370 kN static for steady hook and screw loads. In 89320 M, 893 fixes the 170 mm OD and 42 mm height; 20 selects the 100 mm seat, and the machined brass M cage is the only execution suffix on these rigid-washer bearings. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 300 kN rating assumes oil or grease reaching the full washer face. Minimum axial load is explicit at factor A 0.15: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.15) is present without clamping the rollers.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 100 mm bore the minimum load (A 0.15) is still small, but a vertical shaft at rest loses it entirely — specify springs or check the rotor weight exceeds F_am at zero speed.",
      "the 950 r/min reference speed is the thermal criterion under load, the 1,900 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 300/1370 kN ratings assume flat, full-support washer seats; a housing face narrower than the 170 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.15 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89320 M need different minimum load and lubrication despite the shared 100×170 mm outline.",
      "The 300/1370 kN ratings and 4550 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why does 89320 M need a minimum axial load?",
        "a": "Below factor A 0.15 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 89320 M take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 89320 M be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.15 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 89320 M?",
        "a": "A 89320 M measures 100 mm bore × 170 mm outside diameter × 42 mm width (3.937 × 6.693 × 1.654 in). From SKF catalogue PUB BU/P1 17000: dynamic C 300 kN, static C0 1370 kN, fatigue limit Pu 132 kN, reference speed 950 r/min, limiting speed 1,900 r/min, mass about 4550 g. Raceway diameters Ea 109 mm / Eb 166 mm and minimum load factor A 0.15 guide the seat design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89320",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89320-M",
      "89320 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81122-TN",
    "brand": "SKF",
    "manufacturer_designation": "81122 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 110,
    "D_mm": 145,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 163,
    "static_load_kN": 680,
    "fatigue_load_limit_kN": 65.5,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81122 TN is the rigid-washer thrust solution for a 110 mm shaft: unlike ball thrust types, the line contact of cylindrical rollers gives 163 kN C within just 25 mm of axial space, per the ISO 104 plan. Reading the code: the first three digits 811 give the dimension series (light 811 series), the last two 22 encode the 110 mm shaft washer bore (code 22 × 5), and TN names the cage execution. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. The 1050 g mass and 25 mm axial height sit between 110 and 145 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.037) is present without clamping the rollers.",
    "applications": [
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 110 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 25 mm.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81122 TN size.",
      "the 1,100 r/min reference speed is the thermal criterion under load, the 2,200 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81122 TN need different minimum load and lubrication despite the shared 110×145 mm outline.",
      "The 163/680 kN ratings and 1050 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Are the washers of 81122 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81122 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81122 TN in service?",
        "a": "Unloaded running below factor A 0.037 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 2,200 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81122 TN have?",
        "a": "A 81122 TN measures 110 mm bore × 145 mm outside diameter × 25 mm width (4.331 × 5.709 × 0.984 in). From SKF catalogue PUB BU/P1 17000: dynamic C 163 kN, static C0 680 kN, fatigue limit Pu 65.5 kN, reference speed 1,100 r/min, limiting speed 2,200 r/min, mass about 1050 g. Raceway diameters Ea 114 mm / Eb 141 mm and minimum load factor A 0.037 guide the seat design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81122",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81122-TN",
      "81122 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81222-TN",
    "brand": "SKF",
    "manufacturer_designation": "81222 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 110,
    "D_mm": 160,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 260,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 98,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81222 TN is a single-direction cylindrical roller thrust bearing to ISO 104 in the heavy 812 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 110×160×38 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. The designation 81222 TN states 812 series, 110 mm bore, glass fibre reinforced PA66 TN cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 38 mm height. Speed planning separates the 850 r/min thermal reference from the 1,700 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: locate the shaft washer on the 110 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 160 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 110 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 38 mm.",
      "Factor A 0.08 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81222 TN need different minimum load and lubrication despite the shared 110×160 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81222 TN size.",
      "The 260/1000 kN ratings and 2300 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How should a 81222 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.08 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81222 TN?",
        "a": "A 81222 TN measures 110 mm bore × 160 mm outside diameter × 38 mm width (4.331 × 6.299 × 1.496 in). From SKF catalogue PUB BU/P1 17000: dynamic C 260 kN, static C0 1000 kN, fatigue limit Pu 98 kN, reference speed 850 r/min, limiting speed 1,700 r/min, mass about 2300 g. Raceway diameters Ea 117 mm / Eb 152 mm and minimum load factor A 0.08 guide the seat design."
      },
      {
        "q": "How is the 81222 TN designation read?",
        "a": "The first three digits 812 give the dimension series (heavy 812 series); 22 encodes the 110 mm bore (code 22 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81222 TN need a minimum axial load?",
        "a": "Below factor A 0.08 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81222",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81222-TN",
      "81222 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89322-M",
    "brand": "SKF",
    "manufacturer_designation": "89322 M",
    "series": "89300-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 110,
    "D_mm": 190,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 400,
    "static_load_kN": 1830,
    "fatigue_load_limit_kN": 173,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 6700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a thrust ball bearing of the same envelope is exhausted, 89322 M replaces the ball complement with cylindrical rollers: 110 mm bore, 190 mm OD, rated 1830 kN static for steady hook and screw loads. Reading the code: the first three digits 893 give the dimension series (heavy 893 series), the last two 22 encode the 110 mm shaft washer bore (code 22 × 5), and M names the cage execution. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.27. Selection arithmetic: C 400 kN against C0 1830 kN gives a C0/C ratio of 4.58 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 110 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 48 mm.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89322 M need different minimum load and lubrication despite the shared 110×190 mm outline.",
      "Factor A 0.27 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 89322 M size.",
      "The 400/1830 kN ratings and 6700 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a thrust ball bearing replace the 89322 M?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 89322 M in service?",
        "a": "Unloaded running below factor A 0.27 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 1,700 r/min limiting."
      },
      {
        "q": "Which dimensions does the 89322 M have?",
        "a": "A 89322 M measures 110 mm bore × 190 mm outside diameter × 48 mm width (4.331 × 7.48 × 1.89 in). From SKF catalogue PUB BU/P1 17000: dynamic C 400 kN, static C0 1830 kN, fatigue limit Pu 173 kN, reference speed 850 r/min, limiting speed 1,700 r/min, mass about 6700 g. Raceway diameters Ea 120 mm / Eb 185 mm and minimum load factor A 0.27 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 89322 M belongs to the heavy 893 series, 110×190×48 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89322",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89322-M",
      "89322 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81124-TN",
    "brand": "SKF",
    "manufacturer_designation": "81124 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 120,
    "D_mm": 155,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 170,
    "static_load_kN": 735,
    "fatigue_load_limit_kN": 68,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The light 811 series bearing 81124 TN carries pure axial load at low to moderate speed: 170 kN dynamic and 735 kN static across a 120×155 mm washer pair, 25 mm overall height. In 81124 TN, 811 fixes the 155 mm OD and 25 mm height; 24 selects the 120 mm seat, and the glass fibre reinforced PA66 TN cage is the only execution suffix on these rigid-washer bearings. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 25 mm height. Speed planning separates the 1,100 r/min thermal reference from the 2,200 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.043) is present without clamping the rollers.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 120 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 25 mm.",
      "Factor A 0.043 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81124 TN need different minimum load and lubrication despite the shared 120×155 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81124 TN size.",
      "The 170/735 kN ratings and 1100 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 81124 TN designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 24 encodes the 120 mm bore (code 24 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81124 TN need a minimum axial load?",
        "a": "Below factor A 0.043 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81124 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81124 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.043 minimum load is present."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81124",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81124-TN",
      "81124 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81224-TN",
    "brand": "SKF",
    "manufacturer_designation": "81224 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 120,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 255,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 96.5,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "weight_g": 2550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a thrust ball bearing of the same envelope is exhausted, 81224 TN replaces the ball complement with cylindrical rollers: 120 mm bore, 170 mm OD, rated 1000 kN static for steady hook and screw loads. Reading the code: the first three digits 812 give the dimension series (heavy 812 series), the last two 24 encode the 120 mm shaft washer bore (code 24 × 5), and TN names the cage execution. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. Selection arithmetic: C 255 kN against C0 1000 kN gives a C0/C ratio of 3.92 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: locate the shaft washer on the 120 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 170 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 120 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 39 mm.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81224 TN size.",
      "the 800 r/min reference speed is the thermal criterion under load, the 1,600 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 255/1000 kN ratings assume flat, full-support washer seats; a housing face narrower than the 170 mm washer OD invalidates the rating through edge stress.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81224 TN need different minimum load and lubrication despite the shared 120×170 mm outline.",
      "The 255/1000 kN ratings and 2550 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What ruins a 81224 TN in service?",
        "a": "Unloaded running below factor A 0.08 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 1,600 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81224 TN have?",
        "a": "A 81224 TN measures 120 mm bore × 170 mm outside diameter × 39 mm width (4.724 × 6.693 × 1.535 in). From SKF catalogue PUB BU/P1 17000: dynamic C 255 kN, static C0 1000 kN, fatigue limit Pu 96.5 kN, reference speed 800 r/min, limiting speed 1,600 r/min, mass about 2550 g. Raceway diameters Ea 127 mm / Eb 162 mm and minimum load factor A 0.08 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81224 TN belongs to the heavy 812 series, 120×170×39 mm."
      },
      {
        "q": "Are the washers of 81224 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81224",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81224-TN",
      "81224 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89324-M",
    "brand": "SKF",
    "manufacturer_designation": "89324 M",
    "series": "89300-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 120,
    "D_mm": 210,
    "B_mm": 54,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 510,
    "static_load_kN": 2360,
    "fatigue_load_limit_kN": 216,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "weight_g": 9450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "89324 M is the rigid-washer thrust solution for a 120 mm shaft: unlike ball thrust types, the line contact of cylindrical rollers gives 510 kN C within just 54 mm of axial space, per the ISO 104 plan. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 89324 M sits in the heavy 893 series. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 510 kN rating assumes oil or grease reaching the full washer face. Static safety matters for shock duty: compare peak axial force against C0 2360 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: locate the shaft washer on the 120 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 210 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 120 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 54 mm.",
      "The 510/2360 kN ratings assume flat, full-support washer seats; a housing face narrower than the 210 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.45 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89324 M need different minimum load and lubrication despite the shared 120×210 mm outline.",
      "The 510/2360 kN ratings and 9450 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a thrust ball bearing replace the 89324 M?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 89324 M in service?",
        "a": "Unloaded running below factor A 0.45 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 1,500 r/min limiting."
      },
      {
        "q": "Which dimensions does the 89324 M have?",
        "a": "A 89324 M measures 120 mm bore × 210 mm outside diameter × 54 mm width (4.724 × 8.268 × 2.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 510 kN, static C0 2360 kN, fatigue limit Pu 216 kN, reference speed 750 r/min, limiting speed 1,500 r/min, mass about 9450 g. Raceway diameters Ea 132 mm / Eb 205 mm and minimum load factor A 0.45 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 89324 M belongs to the heavy 893 series, 120×210×54 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89324",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89324-M",
      "89324 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81126-TN",
    "brand": "SKF",
    "manufacturer_designation": "81126 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 130,
    "D_mm": 170,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 200,
    "static_load_kN": 880,
    "fatigue_load_limit_kN": 81.5,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "weight_g": 1650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81126 TN as a separable thrust bearing: the 130 mm shaft washer (WS), the glass fibre reinforced PA66 TN cage holding short cylindrical rollers, and the 170 mm housing washer (GS) can be ordered and mounted individually. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81126 TN sits in the light 811 series. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the glass fibre reinforced PA66 TN cage is standard for this size. Selection arithmetic: C 200 kN against C0 880 kN gives a C0/C ratio of 4.40 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.062) is present without clamping the rollers.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 130 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 30 mm.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81126 TN size.",
      "the 950 r/min reference speed is the thermal criterion under load, the 1,900 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 200/880 kN ratings assume flat, full-support washer seats; a housing face narrower than the 170 mm washer OD invalidates the rating through edge stress.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81126 TN need different minimum load and lubrication despite the shared 130×170 mm outline.",
      "The 200/880 kN ratings and 1650 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81126 TN belongs to the light 811 series, 130×170×30 mm."
      },
      {
        "q": "Are the washers of 81126 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81126 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81126 TN in service?",
        "a": "Unloaded running below factor A 0.062 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 1,900 r/min limiting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81126",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81126-TN",
      "81126 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81226-TN",
    "brand": "SKF",
    "manufacturer_designation": "81226 TN",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 130,
    "D_mm": 190,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 380,
    "static_load_kN": 1460,
    "fatigue_load_limit_kN": 137,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 4000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81226 TN is the rigid-washer thrust solution for a 130 mm shaft: unlike ball thrust types, the line contact of cylindrical rollers gives 380 kN C within just 45 mm of axial space, per the ISO 104 plan. In 81226 TN, 812 fixes the 190 mm OD and 45 mm height; 26 selects the 130 mm seat, and the glass fibre reinforced PA66 TN cage is the only execution suffix on these rigid-washer bearings. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.17. Static safety matters for shock duty: compare peak axial force against C0 1460 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 130 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 45 mm.",
      "Factor A 0.17 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The 380/1460 kN ratings assume flat, full-support washer seats; a housing face narrower than the 190 mm washer OD invalidates the rating through edge stress.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81226 TN need different minimum load and lubrication despite the shared 130×190 mm outline.",
      "The 380/1460 kN ratings and 4000 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 81226 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81226 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.17 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81226 TN?",
        "a": "A 81226 TN measures 130 mm bore × 190 mm outside diameter × 45 mm width (5.118 × 7.48 × 1.772 in). From SKF catalogue PUB BU/P1 17000: dynamic C 380 kN, static C0 1460 kN, fatigue limit Pu 137 kN, reference speed 700 r/min, limiting speed 1,400 r/min, mass about 4000 g. Raceway diameters Ea 137 mm / Eb 181 mm and minimum load factor A 0.17 guide the seat design."
      },
      {
        "q": "How is the 81226 TN designation read?",
        "a": "The first three digits 812 give the dimension series (heavy 812 series); 26 encodes the 130 mm bore (code 26 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81226",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81226-TN",
      "81226 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81128-TN",
    "brand": "SKF",
    "manufacturer_designation": "81128 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 140,
    "D_mm": 180,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 208,
    "static_load_kN": 930,
    "fatigue_load_limit_kN": 85,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "weight_g": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81128 TN is a single-direction cylindrical roller thrust bearing to ISO 104 in the light 811 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 140×180×31 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. The designation 81128 TN states 811 series, 140 mm bore, glass fibre reinforced PA66 TN cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 208 kN rating assumes oil or grease reaching the full washer face. One direction only: 81128 TN cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.069) is present without clamping the rollers.",
    "applications": [
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 140 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 31 mm.",
      "Factor A 0.069 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81128 TN need different minimum load and lubrication despite the shared 140×180 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81128 TN size.",
      "The 208/930 kN ratings and 1900 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 81128 TN designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 28 encodes the 140 mm bore (code 28 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81128 TN need a minimum axial load?",
        "a": "Below factor A 0.069 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81128 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81128 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.069 minimum load is present."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81128",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81128-TN",
      "81128 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81228-M",
    "brand": "SKF",
    "manufacturer_designation": "81228 M",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 140,
    "D_mm": 200,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 360,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 129,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 5050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81228 M as a separable thrust bearing: the 140 mm shaft washer (WS), the machined brass M cage holding short cylindrical rollers, and the 200 mm housing washer (GS) can be ordered and mounted individually. Reading the code: the first three digits 812 give the dimension series (heavy 812 series), the last two 28 encode the 140 mm shaft washer bore (code 28 × 5), and M names the cage execution. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.16. Minimum axial load is explicit at factor A 0.16: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.16) is present without clamping the rollers.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 140 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 46 mm.",
      "The 360/1400 kN ratings assume flat, full-support washer seats; a housing face narrower than the 200 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.16 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "the 700 r/min reference speed is the thermal criterion under load, the 1,400 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81228 M need different minimum load and lubrication despite the shared 140×200 mm outline.",
      "The 360/1400 kN ratings and 5050 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 81228 M have?",
        "a": "A 81228 M measures 140 mm bore × 200 mm outside diameter × 46 mm width (5.512 × 7.874 × 1.811 in). From SKF catalogue PUB BU/P1 17000: dynamic C 360 kN, static C0 1400 kN, fatigue limit Pu 129 kN, reference speed 700 r/min, limiting speed 1,400 r/min, mass about 5050 g. Raceway diameters Ea 150 mm / Eb 191 mm and minimum load factor A 0.16 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81228 M belongs to the heavy 812 series, 140×200×46 mm."
      },
      {
        "q": "Are the washers of 81228 M separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81228 M?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81228",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81228-M",
      "81228 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81130-TN",
    "brand": "SKF",
    "manufacturer_designation": "81130 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 150,
    "D_mm": 190,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 212,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 88,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 81130 TN denotes a cylindrical roller thrust bearing whose rollers run flat on hardened, ground washers — no radial capacity, one axial direction only, and a minimum axial load of factor A 0.08. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81130 TN sits in the light 811 series. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.08. Minimum axial load is explicit at factor A 0.08: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 150 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 31 mm.",
      "The 212/1000 kN ratings assume flat, full-support washer seats; a housing face narrower than the 190 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.08 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "the 850 r/min reference speed is the thermal criterion under load, the 1,700 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81130 TN need different minimum load and lubrication despite the shared 150×190 mm outline.",
      "The 212/1000 kN ratings and 2200 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a thrust ball bearing replace the 81130 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81130 TN in service?",
        "a": "Unloaded running below factor A 0.08 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 1,700 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81130 TN have?",
        "a": "A 81130 TN measures 150 mm bore × 190 mm outside diameter × 31 mm width (5.906 × 7.48 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 212 kN, static C0 1000 kN, fatigue limit Pu 88 kN, reference speed 850 r/min, limiting speed 1,700 r/min, mass about 2200 g. Raceway diameters Ea 155 mm / Eb 185 mm and minimum load factor A 0.08 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81130 TN belongs to the light 811 series, 150×190×31 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81130",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81130-TN",
      "81130 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81230-M",
    "brand": "SKF",
    "manufacturer_designation": "81230 M",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 150,
    "D_mm": 215,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 465,
    "static_load_kN": 1900,
    "fatigue_load_limit_kN": 170,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 7200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81230 M as a separable thrust bearing: the 150 mm shaft washer (WS), the machined brass M cage holding short cylindrical rollers, and the 215 mm housing washer (GS) can be ordered and mounted individually. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81230 M sits in the heavy 812 series. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.29. Static safety matters for shock duty: compare peak axial force against C0 1900 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: locate the shaft washer on the 150 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 215 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 150 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 50 mm.",
      "The 465/1900 kN ratings assume flat, full-support washer seats; a housing face narrower than the 215 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.29 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81230 M need different minimum load and lubrication despite the shared 150×215 mm outline.",
      "The 465/1900 kN ratings and 7200 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a thrust ball bearing replace the 81230 M?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81230 M in service?",
        "a": "Unloaded running below factor A 0.29 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 1,300 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81230 M have?",
        "a": "A 81230 M measures 150 mm bore × 215 mm outside diameter × 50 mm width (5.906 × 8.465 × 1.969 in). From SKF catalogue PUB BU/P1 17000: dynamic C 465 kN, static C0 1900 kN, fatigue limit Pu 170 kN, reference speed 630 r/min, limiting speed 1,300 r/min, mass about 7200 g. Raceway diameters Ea 162 mm / Eb 210 mm and minimum load factor A 0.29 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81230 M belongs to the heavy 812 series, 150×215×50 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81230",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81230-M",
      "81230 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81132-TN",
    "brand": "SKF",
    "manufacturer_designation": "81132 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 160,
    "D_mm": 200,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 216,
    "static_load_kN": 1020,
    "fatigue_load_limit_kN": 90,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The light 811 series bearing 81132 TN carries pure axial load at low to moderate speed: 216 kN dynamic and 1020 kN static across a 160×200 mm washer pair, 31 mm overall height. The designation 81132 TN states 811 series, 160 mm bore, glass fibre reinforced PA66 TN cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 31 mm height. Speed planning separates the 850 r/min thermal reference from the 1,700 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 160 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 31 mm.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81132 TN need different minimum load and lubrication despite the shared 160×200 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81132 TN size.",
      "Factor A 0.083 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The 216/1020 kN ratings and 2100 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 81132 TN take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81132 TN be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.083 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81132 TN?",
        "a": "A 81132 TN measures 160 mm bore × 200 mm outside diameter × 31 mm width (6.299 × 7.874 × 1.22 in). From SKF catalogue PUB BU/P1 17000: dynamic C 216 kN, static C0 1020 kN, fatigue limit Pu 90 kN, reference speed 850 r/min, limiting speed 1,700 r/min, mass about 2100 g. Raceway diameters Ea 165 mm / Eb 195 mm and minimum load factor A 0.083 guide the seat design."
      },
      {
        "q": "How is the 81132 TN designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 32 encodes the 160 mm bore (code 32 × 5); the suffix denotes the glass fibre reinforced PA66 TN cage. WS and GS washers of the same size can be ordered separately."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81132",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81132-TN",
      "81132 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81232-M",
    "brand": "SKF",
    "manufacturer_designation": "81232 M",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 160,
    "D_mm": 225,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 480,
    "static_load_kN": 2000,
    "fatigue_load_limit_kN": 176,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 7600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81232 M as a separable thrust bearing: the 160 mm shaft washer (WS), the machined brass M cage holding short cylindrical rollers, and the 225 mm housing washer (GS) can be ordered and mounted individually. In 81232 M, 812 fixes the 225 mm OD and 51 mm height; 32 selects the 160 mm seat, and the machined brass M cage is the only execution suffix on these rigid-washer bearings. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 51 mm height. Minimum axial load is explicit at factor A 0.32: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.32) is present without clamping the rollers.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 160 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 51 mm.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81232 M need different minimum load and lubrication despite the shared 160×225 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81232 M size.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "the 600 r/min reference speed is the thermal criterion under load, the 1,200 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 480/2000 kN ratings and 7600 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How should a 81232 M be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.32 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81232 M?",
        "a": "A 81232 M measures 160 mm bore × 225 mm outside diameter × 51 mm width (6.299 × 8.858 × 2.008 in). From SKF catalogue PUB BU/P1 17000: dynamic C 480 kN, static C0 2000 kN, fatigue limit Pu 176 kN, reference speed 600 r/min, limiting speed 1,200 r/min, mass about 7600 g. Raceway diameters Ea 171 mm / Eb 219 mm and minimum load factor A 0.32 guide the seat design."
      },
      {
        "q": "How is the 81232 M designation read?",
        "a": "The first three digits 812 give the dimension series (heavy 812 series); 32 encodes the 160 mm bore (code 32 × 5); the suffix denotes the machined brass M cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81232 M need a minimum axial load?",
        "a": "Below factor A 0.32 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81232",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81232-M",
      "81232 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89432-M",
    "brand": "SKF",
    "manufacturer_designation": "89432 M",
    "series": "89400-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 160,
    "D_mm": 320,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1430,
    "static_load_kN": 6400,
    "fatigue_load_limit_kN": 540,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 42000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The extra-heavy 894 series bearing 89432 M carries pure axial load at low to moderate speed: 1430 kN dynamic and 6400 kN static across a 160×320 mm washer pair, 95 mm overall height. Reading the code: the first three digits 894 give the dimension series (extra-heavy 894 series), the last two 32 encode the 160 mm shaft washer bore (code 32 × 5), and M names the cage execution. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the machined brass M cage is standard for this size. The 42000 g mass and 95 mm axial height sit between 160 and 320 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 160 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 95 mm.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89432 M need different minimum load and lubrication despite the shared 160×320 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 89432 M size.",
      "the 480 r/min reference speed is the thermal criterion under load, the 950 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 1430/6400 kN ratings and 42000 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What ruins a 89432 M in service?",
        "a": "Unloaded running below factor A 3.3 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 950 r/min limiting."
      },
      {
        "q": "Which dimensions does the 89432 M have?",
        "a": "A 89432 M measures 160 mm bore × 320 mm outside diameter × 95 mm width (6.299 × 12.598 × 3.74 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1430 kN, static C0 6400 kN, fatigue limit Pu 540 kN, reference speed 480 r/min, limiting speed 950 r/min, mass about 42000 g. Raceway diameters Ea 179 mm / Eb 313 mm and minimum load factor A 3.3 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 89432 M belongs to the extra-heavy 894 series, 160×320×95 mm."
      },
      {
        "q": "Are the washers of 89432 M separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89432",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89432-M",
      "89432 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81134-TN",
    "brand": "SKF",
    "manufacturer_designation": "81134 TN",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 170,
    "D_mm": 215,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 285,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 118,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "weight_g": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81134 TN is a single-direction cylindrical roller thrust bearing to ISO 104 in the light 811 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 170×215×34 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. Reading the code: the first three digits 811 give the dimension series (light 811 series), the last two 34 encode the 170 mm shaft washer bore (code 34 × 5), and TN names the cage execution. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.14. One direction only: 81134 TN cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 170 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 34 mm.",
      "The 285/1340 kN ratings assume flat, full-support washer seats; a housing face narrower than the 215 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.14 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the glass fibre reinforced PA66 TN cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81134 TN need different minimum load and lubrication despite the shared 170×215 mm outline.",
      "The 285/1340 kN ratings and 2400 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Are the washers of 81134 TN separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81134 TN?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81134 TN in service?",
        "a": "Unloaded running below factor A 0.14 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 1,600 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81134 TN have?",
        "a": "A 81134 TN measures 170 mm bore × 215 mm outside diameter × 34 mm width (6.693 × 8.465 × 1.339 in). From SKF catalogue PUB BU/P1 17000: dynamic C 285 kN, static C0 1340 kN, fatigue limit Pu 118 kN, reference speed 800 r/min, limiting speed 1,600 r/min, mass about 2400 g. Raceway diameters Ea 176 mm / Eb 209 mm and minimum load factor A 0.14 guide the seat design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81134",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81134-TN",
      "81134 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81234-M",
    "brand": "SKF",
    "manufacturer_designation": "81234 M",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 170,
    "D_mm": 240,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 540,
    "static_load_kN": 2280,
    "fatigue_load_limit_kN": 200,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 9300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81234 M as a separable thrust bearing: the 170 mm shaft washer (WS), the machined brass M cage holding short cylindrical rollers, and the 240 mm housing washer (GS) can be ordered and mounted individually. The designation 81234 M states 812 series, 170 mm bore, machined brass M cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 540 kN rating assumes oil or grease reaching the full washer face. Selection arithmetic: C 540 kN against C0 2280 kN gives a C0/C ratio of 4.22 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.42) is present without clamping the rollers.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 170 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 55 mm.",
      "Factor A 0.42 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81234 M need different minimum load and lubrication despite the shared 170×240 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81234 M size.",
      "The 540/2280 kN ratings and 9300 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How should a 81234 M be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.42 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81234 M?",
        "a": "A 81234 M measures 170 mm bore × 240 mm outside diameter × 55 mm width (6.693 × 9.449 × 2.165 in). From SKF catalogue PUB BU/P1 17000: dynamic C 540 kN, static C0 2280 kN, fatigue limit Pu 200 kN, reference speed 560 r/min, limiting speed 1,100 r/min, mass about 9300 g. Raceway diameters Ea 184 mm / Eb 233 mm and minimum load factor A 0.42 guide the seat design."
      },
      {
        "q": "How is the 81234 M designation read?",
        "a": "The first three digits 812 give the dimension series (heavy 812 series); 34 encodes the 170 mm bore (code 34 × 5); the suffix denotes the machined brass M cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81234 M need a minimum axial load?",
        "a": "Below factor A 0.42 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81234-M",
      "81234 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89434-M",
    "brand": "SKF",
    "manufacturer_designation": "89434 M",
    "series": "89400-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 170,
    "D_mm": 340,
    "B_mm": 103,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1600,
    "static_load_kN": 7200,
    "fatigue_load_limit_kN": 600,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 52000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The extra-heavy 894 series bearing 89434 M carries pure axial load at low to moderate speed: 1600 kN dynamic and 7200 kN static across a 170×340 mm washer pair, 103 mm overall height. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 89434 M sits in the extra-heavy 894 series. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 4.15. Speed planning separates the 430 r/min thermal reference from the 850 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 170 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 103 mm.",
      "The 1600/7200 kN ratings assume flat, full-support washer seats; a housing face narrower than the 340 mm washer OD invalidates the rating through edge stress.",
      "Factor A 4.15 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 89434 M size.",
      "the 430 r/min reference speed is the thermal criterion under load, the 850 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 1600/7200 kN ratings and 52000 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What ruins a 89434 M in service?",
        "a": "Unloaded running below factor A 4.15 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 850 r/min limiting."
      },
      {
        "q": "Which dimensions does the 89434 M have?",
        "a": "A 89434 M measures 170 mm bore × 340 mm outside diameter × 103 mm width (6.693 × 13.386 × 4.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1600 kN, static C0 7200 kN, fatigue limit Pu 600 kN, reference speed 430 r/min, limiting speed 850 r/min, mass about 52000 g. Raceway diameters Ea 191 mm / Eb 333 mm and minimum load factor A 4.15 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 89434 M belongs to the extra-heavy 894 series, 170×340×103 mm."
      },
      {
        "q": "Are the washers of 89434 M separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89434",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89434-M",
      "89434 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81136-M",
    "brand": "SKF",
    "manufacturer_designation": "81136 M",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 180,
    "D_mm": 225,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 270,
    "static_load_kN": 1270,
    "fatigue_load_limit_kN": 110,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "weight_g": 3700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The light 811 series bearing 81136 M carries pure axial load at low to moderate speed: 270 kN dynamic and 1270 kN static across a 180×225 mm washer pair, 34 mm overall height. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81136 M sits in the light 811 series. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the machined brass M cage is standard for this size. Speed planning separates the 750 r/min thermal reference from the 1,500 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 180 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 34 mm.",
      "The 270/1270 kN ratings assume flat, full-support washer seats; a housing face narrower than the 225 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.13 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81136 M size.",
      "the 750 r/min reference speed is the thermal criterion under load, the 1,500 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 270/1270 kN ratings and 3700 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What ruins a 81136 M in service?",
        "a": "Unloaded running below factor A 0.13 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 1,500 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81136 M have?",
        "a": "A 81136 M measures 180 mm bore × 225 mm outside diameter × 34 mm width (7.087 × 8.858 × 1.339 in). From SKF catalogue PUB BU/P1 17000: dynamic C 270 kN, static C0 1270 kN, fatigue limit Pu 110 kN, reference speed 750 r/min, limiting speed 1,500 r/min, mass about 3700 g. Raceway diameters Ea 185 mm / Eb 219 mm and minimum load factor A 0.13 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81136 M belongs to the light 811 series, 180×225×34 mm."
      },
      {
        "q": "Are the washers of 81136 M separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81136",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81136-M",
      "81136 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81236-M",
    "brand": "SKF",
    "manufacturer_designation": "81236 M",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 550,
    "static_load_kN": 2400,
    "fatigue_load_limit_kN": 204,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 9950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81236 M is a single-direction cylindrical roller thrust bearing to ISO 104 in the heavy 812 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 180×250×56 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81236 M sits in the heavy 812 series. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the machined brass M cage is standard for this size. The 9950 g mass and 56 mm axial height sit between 180 and 250 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 180 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 56 mm.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81236 M size.",
      "the 560 r/min reference speed is the thermal criterion under load, the 1,100 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81236 M need different minimum load and lubrication despite the shared 180×250 mm outline.",
      "The 550/2400 kN ratings and 9950 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What ruins a 81236 M in service?",
        "a": "Unloaded running below factor A 0.46 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 1,100 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81236 M have?",
        "a": "A 81236 M measures 180 mm bore × 250 mm outside diameter × 56 mm width (7.087 × 9.843 × 2.205 in). From SKF catalogue PUB BU/P1 17000: dynamic C 550 kN, static C0 2400 kN, fatigue limit Pu 204 kN, reference speed 560 r/min, limiting speed 1,100 r/min, mass about 9950 g. Raceway diameters Ea 194 mm / Eb 243 mm and minimum load factor A 0.46 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81236 M belongs to the heavy 812 series, 180×250×56 mm."
      },
      {
        "q": "Are the washers of 81236 M separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81236-M",
      "81236 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89436-M",
    "brand": "SKF",
    "manufacturer_designation": "89436 M",
    "series": "89400-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 180,
    "D_mm": 360,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1760,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 655,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 60000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The extra-heavy 894 series bearing 89436 M carries pure axial load at low to moderate speed: 1760 kN dynamic and 8000 kN static across a 180×360 mm washer pair, 109 mm overall height. In 89436 M, 894 fixes the 360 mm OD and 109 mm height; 36 selects the 180 mm seat, and the machined brass M cage is the only execution suffix on these rigid-washer bearings. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the machined brass M cage is standard for this size. Static safety matters for shock duty: compare peak axial force against C0 8000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 180 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 109 mm.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89436 M need different minimum load and lubrication despite the shared 180×360 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 89436 M size.",
      "the 400 r/min reference speed is the thermal criterion under load, the 800 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 1760/8000 kN ratings assume flat, full-support washer seats; a housing face narrower than the 360 mm washer OD invalidates the rating through edge stress.",
      "The 1760/8000 kN ratings and 60000 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 892); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How should a 89436 M be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 5.1 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 89436 M?",
        "a": "A 89436 M measures 180 mm bore × 360 mm outside diameter × 109 mm width (7.087 × 14.173 × 4.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1760 kN, static C0 8000 kN, fatigue limit Pu 655 kN, reference speed 400 r/min, limiting speed 800 r/min, mass about 60000 g. Raceway diameters Ea 200 mm / Eb 351 mm and minimum load factor A 5.1 guide the seat design."
      },
      {
        "q": "How is the 89436 M designation read?",
        "a": "The first three digits 894 give the dimension series (extra-heavy 894 series); 36 encodes the 180 mm bore (code 36 × 5); the suffix denotes the machined brass M cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 89436 M need a minimum axial load?",
        "a": "Below factor A 5.1 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89436",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89436-M",
      "89436 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81138-M",
    "brand": "SKF",
    "manufacturer_designation": "81138 M",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 190,
    "D_mm": 240,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 310,
    "static_load_kN": 1460,
    "fatigue_load_limit_kN": 125,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 4750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The light 811 series bearing 81138 M carries pure axial load at low to moderate speed: 310 kN dynamic and 1460 kN static across a 190×240 mm washer pair, 37 mm overall height. In 81138 M, 811 fixes the 240 mm OD and 37 mm height; 38 selects the 190 mm seat, and the machined brass M cage is the only execution suffix on these rigid-washer bearings. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.17. Static safety matters for shock duty: compare peak axial force against C0 1460 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 190 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 37 mm.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81138 M need different minimum load and lubrication despite the shared 190×240 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81138 M size.",
      "the 700 r/min reference speed is the thermal criterion under load, the 1,400 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 310/1460 kN ratings assume flat, full-support washer seats; a housing face narrower than the 240 mm washer OD invalidates the rating through edge stress.",
      "The 310/1460 kN ratings and 4750 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How should a 81138 M be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.17 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81138 M?",
        "a": "A 81138 M measures 190 mm bore × 240 mm outside diameter × 37 mm width (7.48 × 9.449 × 1.457 in). From SKF catalogue PUB BU/P1 17000: dynamic C 310 kN, static C0 1460 kN, fatigue limit Pu 125 kN, reference speed 700 r/min, limiting speed 1,400 r/min, mass about 4750 g. Raceway diameters Ea 197 mm / Eb 233 mm and minimum load factor A 0.17 guide the seat design."
      },
      {
        "q": "How is the 81138 M designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 38 encodes the 190 mm bore (code 38 × 5); the suffix denotes the machined brass M cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81138 M need a minimum axial load?",
        "a": "Below factor A 0.17 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81138",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81138-M",
      "81138 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81238-M",
    "brand": "SKF",
    "manufacturer_designation": "81238 M",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 190,
    "D_mm": 270,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 695,
    "static_load_kN": 2900,
    "fatigue_load_limit_kN": 250,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81238 M is a single-direction cylindrical roller thrust bearing to ISO 104 in the heavy 812 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 190×270×62 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. Reading the code: the first three digits 812 give the dimension series (heavy 812 series), the last two 38 encode the 190 mm shaft washer bore (code 38 × 5), and M names the cage execution. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 695 kN rating assumes oil or grease reaching the full washer face. Minimum axial load is explicit at factor A 0.67: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Mounting: locate the shaft washer on the 190 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 270 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 190 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 62 mm.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81238 M need different minimum load and lubrication despite the shared 190×270 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81238 M size.",
      "the 500 r/min reference speed is the thermal criterion under load, the 1,000 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 695/2900 kN ratings and 12000 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 81238 M have?",
        "a": "A 81238 M measures 190 mm bore × 270 mm outside diameter × 62 mm width (7.48 × 10.63 × 2.441 in). From SKF catalogue PUB BU/P1 17000: dynamic C 695 kN, static C0 2900 kN, fatigue limit Pu 250 kN, reference speed 500 r/min, limiting speed 1,000 r/min, mass about 12000 g. Raceway diameters Ea 205 mm / Eb 263 mm and minimum load factor A 0.67 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81238 M belongs to the heavy 812 series, 190×270×62 mm."
      },
      {
        "q": "Are the washers of 81238 M separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81238 M?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81238",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81238-M",
      "81238 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89438-M",
    "brand": "SKF",
    "manufacturer_designation": "89438 M",
    "series": "89400-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 190,
    "D_mm": 380,
    "B_mm": 115,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1960,
    "static_load_kN": 9000,
    "fatigue_load_limit_kN": 720,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 65500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 89438 M as a separable thrust bearing: the 190 mm shaft washer (WS), the machined brass M cage holding short cylindrical rollers, and the 380 mm housing washer (GS) can be ordered and mounted individually. The designation 89438 M states 894 series, 190 mm bore, machined brass M cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 6.5. The 65500 g mass and 115 mm axial height sit between 190 and 380 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 6.5) is present without clamping the rollers.",
    "applications": [
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 190 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 115 mm.",
      "Factor A 6.5 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "the 380 r/min reference speed is the thermal criterion under load, the 750 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 1960/9000 kN ratings assume flat, full-support washer seats; a housing face narrower than the 380 mm washer OD invalidates the rating through edge stress.",
      "The 1960/9000 kN ratings and 65500 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 89438 M?",
        "a": "A 89438 M measures 190 mm bore × 380 mm outside diameter × 115 mm width (7.48 × 14.961 × 4.528 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1960 kN, static C0 9000 kN, fatigue limit Pu 720 kN, reference speed 380 r/min, limiting speed 750 r/min, mass about 65500 g. Raceway diameters Ea 212 mm / Eb 371 mm and minimum load factor A 6.5 guide the seat design."
      },
      {
        "q": "How is the 89438 M designation read?",
        "a": "The first three digits 894 give the dimension series (extra-heavy 894 series); 38 encodes the 190 mm bore (code 38 × 5); the suffix denotes the machined brass M cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 89438 M need a minimum axial load?",
        "a": "Below factor A 6.5 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 89438 M take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89438",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89438-M",
      "89438 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81140-M",
    "brand": "SKF",
    "manufacturer_designation": "81140 M",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 200,
    "D_mm": 250,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 310,
    "static_load_kN": 1500,
    "fatigue_load_limit_kN": 125,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 4950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The light 811 series bearing 81140 M carries pure axial load at low to moderate speed: 310 kN dynamic and 1500 kN static across a 200×250 mm washer pair, 37 mm overall height. The designation 81140 M states 811 series, 200 mm bore, machined brass M cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.18. Selection arithmetic: C 310 kN against C0 1500 kN gives a C0/C ratio of 4.84 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.18) is present without clamping the rollers.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 200 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 37 mm.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81140 M need different minimum load and lubrication despite the shared 200×250 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81140 M size.",
      "The 310/1500 kN ratings assume flat, full-support washer seats; a housing face narrower than the 250 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.18 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "The 310/1500 kN ratings and 4950 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why does 81140 M need a minimum axial load?",
        "a": "Below factor A 0.18 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81140 M take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81140 M be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.18 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81140 M?",
        "a": "A 81140 M measures 200 mm bore × 250 mm outside diameter × 37 mm width (7.874 × 9.843 × 1.457 in). From SKF catalogue PUB BU/P1 17000: dynamic C 310 kN, static C0 1500 kN, fatigue limit Pu 125 kN, reference speed 700 r/min, limiting speed 1,400 r/min, mass about 4950 g. Raceway diameters Ea 206 mm / Eb 243 mm and minimum load factor A 0.18 guide the seat design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81140",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81140-M",
      "81140 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81240-M",
    "brand": "SKF",
    "manufacturer_designation": "81240 M",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 720,
    "static_load_kN": 3100,
    "fatigue_load_limit_kN": 255,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 13500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81240 M as a separable thrust bearing: the 200 mm shaft washer (WS), the machined brass M cage holding short cylindrical rollers, and the 280 mm housing washer (GS) can be ordered and mounted individually. The designation 81240 M states 812 series, 200 mm bore, machined brass M cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the machined brass M cage is standard for this size. The 13500 g mass and 62 mm axial height sit between 200 and 280 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 0.77) is present without clamping the rollers.",
    "applications": [
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 200 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 62 mm.",
      "Factor A 0.77 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "the 500 r/min reference speed is the thermal criterion under load, the 1,000 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 720/3100 kN ratings assume flat, full-support washer seats; a housing face narrower than the 280 mm washer OD invalidates the rating through edge stress.",
      "The 720/3100 kN ratings and 13500 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 81240 M take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81240 M be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.77 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81240 M?",
        "a": "A 81240 M measures 200 mm bore × 280 mm outside diameter × 62 mm width (7.874 × 11.024 × 2.441 in). From SKF catalogue PUB BU/P1 17000: dynamic C 720 kN, static C0 3100 kN, fatigue limit Pu 255 kN, reference speed 500 r/min, limiting speed 1,000 r/min, mass about 13500 g. Raceway diameters Ea 215 mm / Eb 273 mm and minimum load factor A 0.77 guide the seat design."
      },
      {
        "q": "How is the 81240 M designation read?",
        "a": "The first three digits 812 give the dimension series (heavy 812 series); 40 encodes the 200 mm bore (code 40 × 5); the suffix denotes the machined brass M cage. WS and GS washers of the same size can be ordered separately."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81240-M",
      "81240 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89440-M",
    "brand": "SKF",
    "manufacturer_designation": "89440 M",
    "series": "89400-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 200,
    "D_mm": 400,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2160,
    "static_load_kN": 10000,
    "fatigue_load_limit_kN": 800,
    "reference_speed_rpm": 360,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "weight_g": 75000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The extra-heavy 894 series bearing 89440 M carries pure axial load at low to moderate speed: 2160 kN dynamic and 10000 kN static across a 200×400 mm washer pair, 122 mm overall height. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 89440 M sits in the extra-heavy 894 series. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 2160 kN rating assumes oil or grease reaching the full washer face. Static safety matters for shock duty: compare peak axial force against C0 10000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 200 mm bore the washers are too stiff to conform to a non-square seat: machine the shoulders parallel or the roller ends concentrate load into a narrow stripe across 122 mm.",
      "The 2160/10000 kN ratings assume flat, full-support washer seats; a housing face narrower than the 400 mm washer OD invalidates the rating through edge stress.",
      "Factor A 8 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89440 M need different minimum load and lubrication despite the shared 200×400 mm outline.",
      "The 2160/10000 kN ratings and 75000 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a thrust ball bearing replace the 89440 M?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 89440 M in service?",
        "a": "Unloaded running below factor A 8 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 700 r/min limiting."
      },
      {
        "q": "Which dimensions does the 89440 M have?",
        "a": "A 89440 M measures 200 mm bore × 400 mm outside diameter × 122 mm width (7.874 × 15.748 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2160 kN, static C0 10000 kN, fatigue limit Pu 800 kN, reference speed 360 r/min, limiting speed 700 r/min, mass about 75000 g. Raceway diameters Ea 224 mm / Eb 391 mm and minimum load factor A 8 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 89440 M belongs to the extra-heavy 894 series, 200×400×122 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89440",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89440-M",
      "89440 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81144-M",
    "brand": "SKF",
    "manufacturer_designation": "81144 M",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 220,
    "D_mm": 270,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 335,
    "static_load_kN": 1700,
    "fatigue_load_limit_kN": 137,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 5200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The light 811 series bearing 81144 M carries pure axial load at low to moderate speed: 335 kN dynamic and 1700 kN static across a 220×270 mm washer pair, 37 mm overall height. Reading the code: the first three digits 811 give the dimension series (light 811 series), the last two 44 encode the 220 mm shaft washer bore (code 44 × 5), and M names the cage execution. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 335 kN rating assumes oil or grease reaching the full washer face. Minimum axial load is explicit at factor A 0.23: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 220 mm bore the 5.2 kg washer set needs forced lubrication and controlled start-up sequencing; dry first rotation under load is the classic destruction mode for very large thrust bearings.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81144 M size.",
      "the 670 r/min reference speed is the thermal criterion under load, the 1,300 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "Factor A 0.23 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The 335/1700 kN ratings and 5200 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a thrust ball bearing replace the 81144 M?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81144 M in service?",
        "a": "Unloaded running below factor A 0.23 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 1,300 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81144 M have?",
        "a": "A 81144 M measures 220 mm bore × 270 mm outside diameter × 37 mm width (8.661 × 10.63 × 1.457 in). From SKF catalogue PUB BU/P1 17000: dynamic C 335 kN, static C0 1700 kN, fatigue limit Pu 137 kN, reference speed 670 r/min, limiting speed 1,300 r/min, mass about 5200 g. Raceway diameters Ea 226 mm / Eb 263 mm and minimum load factor A 0.23 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81144 M belongs to the light 811 series, 220×270×37 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81144",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81144-M",
      "81144 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81244-M",
    "brand": "SKF",
    "manufacturer_designation": "81244 M",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 63,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 750,
    "static_load_kN": 3350,
    "fatigue_load_limit_kN": 275,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 15000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81244 M is a single-direction cylindrical roller thrust bearing to ISO 104 in the heavy 812 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 220×300×63 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. Reading the code: the first three digits 812 give the dimension series (heavy 812 series), the last two 44 encode the 220 mm shaft washer bore (code 44 × 5), and M names the cage execution. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the machined brass M cage is standard for this size. One direction only: 81244 M cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: locate the shaft washer on the 220 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 300 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 220 mm bore the 15 kg washer set needs forced lubrication and controlled start-up sequencing; dry first rotation under load is the classic destruction mode for very large thrust bearings.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81244 M need different minimum load and lubrication despite the shared 220×300 mm outline.",
      "The 750/3350 kN ratings assume flat, full-support washer seats; a housing face narrower than the 300 mm washer OD invalidates the rating through edge stress.",
      "Factor A 0.9 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "The 750/3350 kN ratings and 15000 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What ruins a 81244 M in service?",
        "a": "Unloaded running below factor A 0.9 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 950 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81244 M have?",
        "a": "A 81244 M measures 220 mm bore × 300 mm outside diameter × 63 mm width (8.661 × 11.811 × 2.48 in). From SKF catalogue PUB BU/P1 17000: dynamic C 750 kN, static C0 3350 kN, fatigue limit Pu 275 kN, reference speed 480 r/min, limiting speed 950 r/min, mass about 15000 g. Raceway diameters Ea 236 mm / Eb 294 mm and minimum load factor A 0.9 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81244 M belongs to the heavy 812 series, 220×300×63 mm."
      },
      {
        "q": "Are the washers of 81244 M separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81244-M",
      "81244 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "89444-M",
    "brand": "SKF",
    "manufacturer_designation": "89444 M",
    "series": "89400-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 220,
    "D_mm": 420,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 2320,
    "static_load_kN": 11200,
    "fatigue_load_limit_kN": 880,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "weight_g": 84500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 89444 M as a separable thrust bearing: the 220 mm shaft washer (WS), the machined brass M cage holding short cylindrical rollers, and the 420 mm housing washer (GS) can be ordered and mounted individually. The designation 89444 M states 894 series, 220 mm bore, machined brass M cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 2320 kN rating assumes oil or grease reaching the full washer face. Selection arithmetic: C 2320 kN against C0 11200 kN gives a C0/C ratio of 4.83 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 10) is present without clamping the rollers.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 220 mm bore the 84.5 kg washer set needs forced lubrication and controlled start-up sequencing; dry first rotation under load is the classic destruction mode for very large thrust bearings.",
      "Factor A 10 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 89444 M need different minimum load and lubrication despite the shared 220×420 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 89444 M size.",
      "The 2320/11200 kN ratings and 84500 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How should a 89444 M be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 10 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 89444 M?",
        "a": "A 89444 M measures 220 mm bore × 420 mm outside diameter × 122 mm width (8.661 × 16.535 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2320 kN, static C0 11200 kN, fatigue limit Pu 880 kN, reference speed 340 r/min, limiting speed 700 r/min, mass about 84500 g. Raceway diameters Ea 244 mm / Eb 411 mm and minimum load factor A 10 guide the seat design."
      },
      {
        "q": "How is the 89444 M designation read?",
        "a": "The first three digits 894 give the dimension series (extra-heavy 894 series); 44 encodes the 220 mm bore (code 44 × 5); the suffix denotes the machined brass M cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 89444 M need a minimum axial load?",
        "a": "Below factor A 10 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "89444",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "89444-M",
      "89444 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81148-M",
    "brand": "SKF",
    "manufacturer_designation": "81148 M",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 240,
    "D_mm": 300,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 475,
    "static_load_kN": 2450,
    "fatigue_load_limit_kN": 196,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 8450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The light 811 series bearing 81148 M carries pure axial load at low to moderate speed: 475 kN dynamic and 2450 kN static across a 240×300 mm washer pair, 45 mm overall height. In 81148 M, 811 fixes the 300 mm OD and 45 mm height; 48 selects the 240 mm seat, and the machined brass M cage is the only execution suffix on these rigid-washer bearings. The three components are separable and interchangeable within the size: WS shaft washer, K-cage roller set, GS housing washer, all running on flat, square seats; the machined brass M cage is standard for this size. Static safety matters for shock duty: compare peak axial force against C0 2450 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: locate the shaft washer on the 240 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 300 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 240 mm bore the 8.4 kg washer set needs forced lubrication and controlled start-up sequencing; dry first rotation under load is the classic destruction mode for very large thrust bearings.",
      "the 560 r/min reference speed is the thermal criterion under load, the 1,100 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 475/2450 kN ratings assume flat, full-support washer seats; a housing face narrower than the 300 mm washer OD invalidates the rating through edge stress.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81148 M need different minimum load and lubrication despite the shared 240×300 mm outline.",
      "The 475/2450 kN ratings and 8450 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How should a 81148 M be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 0.48 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81148 M?",
        "a": "A 81148 M measures 240 mm bore × 300 mm outside diameter × 45 mm width (9.449 × 11.811 × 1.772 in). From SKF catalogue PUB BU/P1 17000: dynamic C 475 kN, static C0 2450 kN, fatigue limit Pu 196 kN, reference speed 560 r/min, limiting speed 1,100 r/min, mass about 8450 g. Raceway diameters Ea 248 mm / Eb 296 mm and minimum load factor A 0.48 guide the seat design."
      },
      {
        "q": "How is the 81148 M designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 48 encodes the 240 mm bore (code 48 × 5); the suffix denotes the machined brass M cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81148 M need a minimum axial load?",
        "a": "Below factor A 0.48 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81148",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81148-M",
      "81148 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81248-M",
    "brand": "SKF",
    "manufacturer_designation": "81248 M",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 240,
    "D_mm": 340,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1100,
    "static_load_kN": 4900,
    "fatigue_load_limit_kN": 390,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 22000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81248 M is a single-direction cylindrical roller thrust bearing to ISO 104 in the heavy 812 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 240×340×78 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. In 81248 M, 812 fixes the 340 mm OD and 78 mm height; 48 selects the 240 mm seat, and the machined brass M cage is the only execution suffix on these rigid-washer bearings. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 78 mm height. Speed planning separates the 400 r/min thermal reference from the 800 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 1.92) is present without clamping the rollers.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 240 mm bore the 22 kg washer set needs forced lubrication and controlled start-up sequencing; dry first rotation under load is the classic destruction mode for very large thrust bearings.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81248 M need different minimum load and lubrication despite the shared 240×340 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81248 M size.",
      "Factor A 1.92 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The 1100/4900 kN ratings and 22000 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 81248 M?",
        "a": "A 81248 M measures 240 mm bore × 340 mm outside diameter × 78 mm width (9.449 × 13.386 × 3.071 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1100 kN, static C0 4900 kN, fatigue limit Pu 390 kN, reference speed 400 r/min, limiting speed 800 r/min, mass about 22000 g. Raceway diameters Ea 263 mm / Eb 333 mm and minimum load factor A 1.92 guide the seat design."
      },
      {
        "q": "How is the 81248 M designation read?",
        "a": "The first three digits 812 give the dimension series (heavy 812 series); 48 encodes the 240 mm bore (code 48 × 5); the suffix denotes the machined brass M cage. WS and GS washers of the same size can be ordered separately."
      },
      {
        "q": "Why does 81248 M need a minimum axial load?",
        "a": "Below factor A 1.92 the cylindrical rollers skid instead of rolling, glazing and smearing the washer tracks. Springs, preload shims or rotor weight must keep the thrust above the catalogue minimum, especially during unloaded starts."
      },
      {
        "q": "Can the 81248 M take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81248-M",
      "81248 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81152-M",
    "brand": "SKF",
    "manufacturer_designation": "81152 M",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 260,
    "D_mm": 320,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 490,
    "static_load_kN": 2600,
    "fatigue_load_limit_kN": 200,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 9100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The light 811 series bearing 81152 M carries pure axial load at low to moderate speed: 490 kN dynamic and 2600 kN static across a 260×320 mm washer pair, 45 mm overall height. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81152 M sits in the light 811 series. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 0.54. The 9100 g mass and 45 mm axial height sit between 260 and 320 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 260 mm bore the 9.1 kg washer set needs forced lubrication and controlled start-up sequencing; dry first rotation under load is the classic destruction mode for very large thrust bearings.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81152 M need different minimum load and lubrication despite the shared 260×320 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81152 M size.",
      "the 530 r/min reference speed is the thermal criterion under load, the 1,100 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 490/2600 kN ratings and 9100 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Are the washers of 81152 M separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81152 M?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81152 M in service?",
        "a": "Unloaded running below factor A 0.54 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 1,100 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81152 M have?",
        "a": "A 81152 M measures 260 mm bore × 320 mm outside diameter × 45 mm width (10.236 × 12.598 × 1.772 in). From SKF catalogue PUB BU/P1 17000: dynamic C 490 kN, static C0 2600 kN, fatigue limit Pu 200 kN, reference speed 530 r/min, limiting speed 1,100 r/min, mass about 9100 g. Raceway diameters Ea 268 mm / Eb 316 mm and minimum load factor A 0.54 guide the seat design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81152",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81152-M",
      "81152 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81252-M",
    "brand": "SKF",
    "manufacturer_designation": "81252 M",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 79,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1140,
    "static_load_kN": 5300,
    "fatigue_load_limit_kN": 415,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 27000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "81252 M is a single-direction cylindrical roller thrust bearing to ISO 104 in the heavy 812 series: a flat shaft washer, a roller-and-cage set and a housing washer stacked to 260×360×79 mm, listed in SKF catalogue PUB BU/P1 17000 ch. 11.1. SKF thrust-roller numbering mirrors the ball 511/512 plan with 811/812: 812 is the higher (heavier) section per bore, and 893/894 are the very heavy series — 81252 M sits in the heavy 812 series. Small sizes ship with machined brass M cages to guide heavy rollers at the lubricant limit; the 1140 kN rating assumes oil or grease reaching the full washer face. Selection arithmetic: C 1140 kN against C0 5300 kN gives a C0/C ratio of 4.65 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: locate the shaft washer on the 260 mm seat (it rotates and takes an interference fit), leave the housing washer a sliding fit in the 360 mm bore, and check the stack can tilt freely before clamping.",
    "applications": [
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 260 mm bore the 27 kg washer set needs forced lubrication and controlled start-up sequencing; dry first rotation under load is the classic destruction mode for very large thrust bearings.",
      "The 1140/5300 kN ratings assume flat, full-support washer seats; a housing face narrower than the 360 mm washer OD invalidates the rating through edge stress.",
      "Factor A 2.25 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81252 M need different minimum load and lubrication despite the shared 260×360 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81252 M size.",
      "The 1140/5300 kN ratings and 27000 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a thrust ball bearing replace the 81252 M?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81252 M in service?",
        "a": "Unloaded running below factor A 2.25 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 750 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81252 M have?",
        "a": "A 81252 M measures 260 mm bore × 360 mm outside diameter × 79 mm width (10.236 × 14.173 × 3.11 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1140 kN, static C0 5300 kN, fatigue limit Pu 415 kN, reference speed 380 r/min, limiting speed 750 r/min, mass about 27000 g. Raceway diameters Ea 281 mm / Eb 351 mm and minimum load factor A 2.25 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81252 M belongs to the heavy 812 series, 260×360×79 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81252",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81252-M",
      "81252 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81156-M",
    "brand": "SKF",
    "manufacturer_designation": "81156 M",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 280,
    "D_mm": 350,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 680,
    "static_load_kN": 3550,
    "fatigue_load_limit_kN": 275,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81156 M as a separable thrust bearing: the 280 mm shaft washer (WS), the machined brass M cage holding short cylindrical rollers, and the 350 mm housing washer (GS) can be ordered and mounted individually. The designation 81156 M states 811 series, 280 mm bore, machined brass M cage; shaft and housing washers are also orderable separately as WS and GS parts of the same size. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 1. One direction only: 81156 M cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 1) is present without clamping the rollers.",
    "applications": [
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 280 mm bore the 12.5 kg washer set needs forced lubrication and controlled start-up sequencing; dry first rotation under load is the classic destruction mode for very large thrust bearings.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81156 M need different minimum load and lubrication despite the shared 280×350 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81156 M size.",
      "the 480 r/min reference speed is the thermal criterion under load, the 950 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "The 680/3550 kN ratings assume flat, full-support washer seats; a housing face narrower than the 350 mm washer OD invalidates the rating through edge stress.",
      "The 680/3550 kN ratings and 12500 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 81156 M take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81156 M be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 1 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81156 M?",
        "a": "A 81156 M measures 280 mm bore × 350 mm outside diameter × 53 mm width (11.024 × 13.78 × 2.087 in). From SKF catalogue PUB BU/P1 17000: dynamic C 680 kN, static C0 3550 kN, fatigue limit Pu 275 kN, reference speed 480 r/min, limiting speed 950 r/min, mass about 12500 g. Raceway diameters Ea 288 mm / Eb 346 mm and minimum load factor A 1 guide the seat design."
      },
      {
        "q": "How is the 81156 M designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 56 encodes the 280 mm bore (code 56 × 5); the suffix denotes the machined brass M cage. WS and GS washers of the same size can be ordered separately."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81156",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81156-M",
      "81156 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81160-M",
    "brand": "SKF",
    "manufacturer_designation": "81160 M",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 300,
    "D_mm": 380,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 850,
    "static_load_kN": 4400,
    "fatigue_load_limit_kN": 335,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 19500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81160 M as a separable thrust bearing: the 300 mm shaft washer (WS), the machined brass M cage holding short cylindrical rollers, and the 380 mm housing washer (GS) can be ordered and mounted individually. Reading the code: the first three digits 811 give the dimension series (light 811 series), the last two 60 encode the 300 mm shaft washer bore (code 60 × 5), and M names the cage execution. Rigid washers mean no self-alignment: the shaft and housing shoulders must be square and parallel to within the catalogue seat tolerances, or the rollers edge-load across the 62 mm height. One direction only: 81160 M cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Press only on washer backs, never through the roller set; seat both washers against full-area square shoulders, and shim the housing cover so the minimum load (A 1.55) is present without clamping the rollers.",
    "applications": [
      "slewing and turntable pivots with predominantly axial force",
      "crane hook crossheads carrying pure hook thrust while the hook swivels",
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 300 mm bore the 19.5 kg washer set needs forced lubrication and controlled start-up sequencing; dry first rotation under load is the classic destruction mode for very large thrust bearings.",
      "The 850/4400 kN ratings assume flat, full-support washer seats; a housing face narrower than the 380 mm washer OD invalidates the rating through edge stress.",
      "Factor A 1.55 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81160 M need different minimum load and lubrication despite the shared 300×380 mm outline.",
      "The 850/4400 kN ratings and 19500 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Are the washers of 81160 M separable?",
        "a": "Yes — shaft washer WS, roller-and-cage set and housing washer GS are separate and interchangeable within the size, but never across series: an 811 and an 812 washer for the same bore differ in OD and height."
      },
      {
        "q": "Can a thrust ball bearing replace the 81160 M?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81160 M in service?",
        "a": "Unloaded running below factor A 1.55 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 850 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81160 M have?",
        "a": "A 81160 M measures 300 mm bore × 380 mm outside diameter × 62 mm width (11.811 × 14.961 × 2.441 in). From SKF catalogue PUB BU/P1 17000: dynamic C 850 kN, static C0 4400 kN, fatigue limit Pu 335 kN, reference speed 430 r/min, limiting speed 850 r/min, mass about 19500 g. Raceway diameters Ea 315 mm / Eb 373 mm and minimum load factor A 1.55 guide the seat design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81160",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81160-M",
      "81160 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81260-M",
    "brand": "SKF",
    "manufacturer_designation": "81260 M",
    "series": "81200-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1530,
    "static_load_kN": 7200,
    "fatigue_load_limit_kN": 540,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 630,
    "max_rpm": 630,
    "weight_g": 43000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a thrust ball bearing of the same envelope is exhausted, 81260 M replaces the ball complement with cylindrical rollers: 300 mm bore, 420 mm OD, rated 7200 kN static for steady hook and screw loads. Reading the code: the first three digits 812 give the dimension series (heavy 812 series), the last two 60 encode the 300 mm shaft washer bore (code 60 × 5), and M names the cage execution. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 4.1. Minimum axial load is explicit at factor A 4.1: below F_am = A·n² (or the catalogue's slow-speed floor) the cylindrical rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters",
      "slewing and turntable pivots with predominantly axial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 300 mm bore the 43 kg washer set needs forced lubrication and controlled start-up sequencing; dry first rotation under load is the classic destruction mode for very large thrust bearings.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81260 M size.",
      "the 320 r/min reference speed is the thermal criterion under load, the 630 r/min limiting speed is mechanical and oil lubrication typically raises the usable figure.",
      "Factor A 4.1 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "The 1530/7200 kN ratings and 43000 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can a thrust ball bearing replace the 81260 M?",
        "a": "They share ISO boundary outlines (e.g. 511 vs 811), but the roller bearing needs a higher minimum axial load and different lubrication, and its C/C0 figures are not interchangeable — re-run the selection before substituting."
      },
      {
        "q": "What ruins a 81260 M in service?",
        "a": "Unloaded running below factor A 4.1 causes skidding; non-square or narrow shoulders fret the washer backs; dry starts and contamination do the rest. Speed ceiling: 630 r/min limiting."
      },
      {
        "q": "Which dimensions does the 81260 M have?",
        "a": "A 81260 M measures 300 mm bore × 420 mm outside diameter × 95 mm width (11.811 × 16.535 × 3.74 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1530 kN, static C0 7200 kN, fatigue limit Pu 540 kN, reference speed 320 r/min, limiting speed 630 r/min, mass about 43000 g. Raceway diameters Ea 329 mm / Eb 412 mm and minimum load factor A 4.1 guide the seat design."
      },
      {
        "q": "What is the difference between 811 and 812 series?",
        "a": "811 is the light section and 812 the higher, heavier section for the same bore; 893/894 are the extra-heavy series. 81260 M belongs to the heavy 812 series, 300×420×95 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81260-M",
      "81260 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "81164-M",
    "brand": "SKF",
    "manufacturer_designation": "81164 M",
    "series": "81100-series",
    "type": "cylindrical_roller_thrust",
    "d_mm": 320,
    "D_mm": 400,
    "B_mm": 63,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 880,
    "static_load_kN": 4650,
    "fatigue_load_limit_kN": 345,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 20500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 81164 M as a separable thrust bearing: the 320 mm shaft washer (WS), the machined brass M cage holding short cylindrical rollers, and the 400 mm housing washer (GS) can be ordered and mounted individually. In 81164 M, 811 fixes the 400 mm OD and 63 mm height; 64 selects the 320 mm seat, and the machined brass M cage is the only execution suffix on these rigid-washer bearings. The bearing takes thrust in one direction only — reverse loads lift the roller set off its track; arrange a mirrored second bearing for reversing duty, and keep the applied load above factor A 1.73. Speed planning separates the 400 r/min thermal reference from the 800 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. In vertical shafts let the rotor weight provide the minimum load where possible; otherwise fit a spring pack above the housing washer, and verify the washer face is flooded with oil at first start.",
    "applications": [
      "screw jack and lifting screw thrust positions under slow, steady load",
      "vertical electric motor and pump shafts whose rotor weight loads one bearing",
      "extruder and injection press screw thrust blocks at low speed",
      "rolling-mill screwdown mechanisms and press adjusters"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 320 mm bore the 20.5 kg washer set needs forced lubrication and controlled start-up sequencing; dry first rotation under load is the classic destruction mode for very large thrust bearings.",
      "Factor A 1.73 is a mounting requirement, not advice: below the minimum axial load the rollers skid at speed — most \"mysterious\" early thrust failures are unloaded running.",
      "Keep the machined brass M cage out of chemical contact with aggressive EP additives beyond its compatibility list; cage damage here redistributes rollers and destroys the washer in hours.",
      "Do not substitute a thrust ball bearing of the same ISO envelope by rating alone: the cylindrical rollers of 81164 M need different minimum load and lubrication despite the shared 320×400 mm outline.",
      "The separable washers are not interchangeable across series: an 811 and an 812 washer for the same bore differ in OD and height — order WS/GS parts by the full 81164 M size.",
      "The 880/4650 kN ratings and 20500 g mass are SKF catalogue values transcribed from ch. 11.1 of PUB BU/P1 17000 (PDF table page 894); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 81164 M take reversing thrust?",
        "a": "No. It carries axial load in one direction only; reversing force unloads and impacts the roller set. Use a mirrored pair of bearings for reversing shafts, with a separate arrangement for radial load."
      },
      {
        "q": "How should a 81164 M be mounted?",
        "a": "Interference fit for the shaft washer, sliding fit for the housing washer, full-area square shoulders both sides, press on washer backs only, and shim the cover so the rollers turn freely while the factor-A 1.73 minimum load is present."
      },
      {
        "q": "What are the dimensions and ratings of the 81164 M?",
        "a": "A 81164 M measures 320 mm bore × 400 mm outside diameter × 63 mm width (12.598 × 15.748 × 2.48 in). From SKF catalogue PUB BU/P1 17000: dynamic C 880 kN, static C0 4650 kN, fatigue limit Pu 345 kN, reference speed 400 r/min, limiting speed 800 r/min, mass about 20500 g. Raceway diameters Ea 334 mm / Eb 394 mm and minimum load factor A 1.73 guide the seat design."
      },
      {
        "q": "How is the 81164 M designation read?",
        "a": "The first three digits 811 give the dimension series (light 811 series); 64 encodes the 320 mm bore (code 64 × 5); the suffix denotes the machined brass M cage. WS and GS washers of the same size can be ordered separately."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "81164",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 11.1 cylindrical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "81164-M",
      "81164 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK0414-TN",
    "brand": "SKF",
    "manufacturer_designation": "AXK 0414 TN",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 4,
    "D_mm": 14,
    "B_mm": 2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 4.15,
    "static_load_kN": 8.3,
    "fatigue_load_limit_kN": 0.95,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 0.7,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, AXK 0414 TN denotes the needle thrust assembly whose code reads the raceway diameters directly — 04/14 — intended to run against hardened, ground washers or machine faces. In AXK 0414 TN the number is the boundary plan, not a bore code: 04/14, with the 2 mm assembly thickness fixed by the ISO 3031 plan and Ea/Eb 5/13 mm marking the actual needle-contact band. The thin section tolerates no misalignment: keep the mating faces parallel, and use the AXW spigot-flanged execution where a one-piece, housing-centred cage-plus-washer unit simplifies assembly. Static safety matters for shock duty: compare peak axial force against C0 8.3 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 5–Eb 13 mm band (or fit AS/LS washers), drop the 2 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "two-wheeler gearbox selector and layshaft thrust faces",
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars"
    ],
    "failure_modes": [
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish"
    ],
    "pitfalls": [
      "The AXK 0414 TN is watchmaking-scale (2 mm thick, 0.7 g): handle it with tweezers, grease it onto its washer, and assume one dropped or cocked assembly is one ruined bearing.",
      "Do not expect misalignment tolerance: a 2 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "TN polymer and stamped steel cages of the same code (AXK 0414) share envelopes and ratings; the choice is temperature and noise, not load.",
      "The 4.15 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "The AXK code supplies no washers: AXK 0414 TN arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 4.15/8.3 kN ratings and 0.7 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Does the AXK 0414 TN include washers?",
        "a": "No. AXK is the needle roller and cage thrust assembly only; hardened AS/LS washers or shaft/housing faces at 58–64 HRC, ground over the Ea 5–Eb 13 mm band, supply the two raceways."
      },
      {
        "q": "How is the AXK 0414 TN code read?",
        "a": "AXK marks the needle thrust assembly and 04/14 gives the inner 4 mm and outer 14 mm track diameters directly; the assembly is 2 mm thick. TN means the polymer cage instead of stamped steel."
      },
      {
        "q": "What minimum hardness do the mating faces need?",
        "a": "58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 4.15 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated."
      },
      {
        "q": "How is an AXK thrust assembly mounted?",
        "a": "Harden or washer-face both tracks across Ea 5–Eb 13 mm, keep faces parallel, locate the cage concentrically against a shoulder or register, grease the needles so they stay pocketed, and never press through them."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK0414",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK0414-TN",
      "AXK 0414 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK0515-TN",
    "brand": "SKF",
    "manufacturer_designation": "AXK 0515 TN",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 5,
    "D_mm": 15,
    "B_mm": 2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 4.5,
    "static_load_kN": 9.5,
    "fatigue_load_limit_kN": 1.08,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 0.8,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "For transmission gears that would otherwise rub on a housing wall, AXK 0515 TN supplies a complete needle thrust track between 6 and 14 mm raceway diameters in a 2 mm envelope. SKF prints the AXK sizes as adjacent figures, so 05/15 reads 5 then 15 mm; the assembly has no washers of its own — order AS/LS washers or harden the mating faces. The thin section tolerates no misalignment: keep the mating faces parallel, and use the AXW spigot-flanged execution where a one-piece, housing-centred cage-plus-washer unit simplifies assembly. Speed planning separates the 6,700 r/min thermal reference from the 14,000 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Keep the assembly concentric with a shaft shoulder or the housing register — a needle set walking radially off its track is the most common failure; the AXW flanged version removes this risk entirely.",
    "applications": [
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces"
    ],
    "failure_modes": [
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish"
    ],
    "pitfalls": [
      "The AXK 0515 TN is watchmaking-scale (2 mm thick, 0.8 g): handle it with tweezers, grease it onto its washer, and assume one dropped or cocked assembly is one ruined bearing.",
      "Match washers by the exact 5–15 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "the 6,700 r/min reference speed is the thermal criterion under load, the 14,000 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 4.5 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "Do not expect misalignment tolerance: a 2 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "The 4.5/9.5 kN ratings and 0.8 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why does an AXK assembly fail early?",
        "a": "Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 4.5 kN assumes all of these are correct."
      },
      {
        "q": "Which dimensions does the AXK 0515 TN have?",
        "a": "A AXK 0515 TN measures 5 mm bore × 15 mm outside diameter × 2 mm width (0.197 × 0.591 × 0.079 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4.5 kN, static C0 9.5 kN, fatigue limit Pu 1.08 kN, reference speed 6,700 r/min, limiting speed 14,000 r/min, mass about 0.8 g. The contact band runs Ea 6–Eb 14 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "What does AXK 05/15 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 5 mm inner track and 15 mm outer track, 2 mm thick; one-direction axial load, washers ordered separately."
      },
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK0515",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK0515-TN",
      "AXK 0515 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK0619-TN",
    "brand": "SKF",
    "manufacturer_designation": "AXK 0619 TN",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 6,
    "D_mm": 19,
    "B_mm": 2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 6.3,
    "static_load_kN": 16,
    "fatigue_load_limit_kN": 1.86,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 1,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "AXK 0619 TN is a needle roller and cage thrust assembly to ISO 3031: a 2 mm thin cage packing the maximum number of small needles for a 6 mm shaft raceway and 19 mm outside track, as listed in SKF catalogue PUB BU/P1 17000 ch. 12.1. The designation AXK 0619 TN identifies a 2 mm needle thrust cage for the 6–19 mm track; the same diameters select the matching hardened washers, which is the usual ordering error to avoid. Washer selection is part of the bearing: too-soft faces rib within weeks even though the 6.3 kN rating is unchanged — the AXK code only supplies the rolling elements. No factor A is published for needle thrust sets: keep a light preload so the needles roll rather than skid — springs, shim preload or the gear's own backlash take-up are part of the selection, not an accessory. Keep the assembly concentric with a shaft shoulder or the housing register — a needle set walking radially off its track is the most common failure; the AXW flanged version removes this risk entirely.",
    "applications": [
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces",
      "compact drives where hardened washers replace a machined raceway shoulder"
    ],
    "failure_modes": [
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish"
    ],
    "pitfalls": [
      "The AXK 0619 TN is watchmaking-scale (2 mm thick, 1 g): handle it with tweezers, grease it onto its washer, and assume one dropped or cocked assembly is one ruined bearing.",
      "Do not expect misalignment tolerance: a 2 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "TN polymer and stamped steel cages of the same code (AXK 0619) share envelopes and ratings; the choice is temperature and noise, not load.",
      "Match washers by the exact 6–19 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "the 6,000 r/min reference speed is the thermal criterion under load, the 12,000 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 6.3/16 kN ratings and 1 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the AXK 0619 TN?",
        "a": "A AXK 0619 TN measures 6 mm bore × 19 mm outside diameter × 2 mm width (0.236 × 0.748 × 0.079 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6.3 kN, static C0 16 kN, fatigue limit Pu 1.86 kN, reference speed 6,000 r/min, limiting speed 12,000 r/min, mass about 1 g. The contact band runs Ea 7–Eb 18 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "Does the AXK 0619 TN include washers?",
        "a": "No. AXK is the needle roller and cage thrust assembly only; hardened AS/LS washers or shaft/housing faces at 58–64 HRC, ground over the Ea 7–Eb 18 mm band, supply the two raceways."
      },
      {
        "q": "How is the AXK 0619 TN code read?",
        "a": "AXK marks the needle thrust assembly and 06/19 gives the inner 6 mm and outer 19 mm track diameters directly; the assembly is 2 mm thick. TN means the polymer cage instead of stamped steel."
      },
      {
        "q": "What minimum hardness do the mating faces need?",
        "a": "58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 6.3 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK0619",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK0619-TN",
      "AXK 0619 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK0821-TN",
    "brand": "SKF",
    "manufacturer_designation": "AXK 0821 TN",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 8,
    "D_mm": 21,
    "B_mm": 2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 7.2,
    "static_load_kN": 20,
    "fatigue_load_limit_kN": 2.32,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 2,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, AXK 0821 TN denotes the needle thrust assembly whose code reads the raceway diameters directly — 08/21 — intended to run against hardened, ground washers or machine faces. In AXK 0821 TN the number is the boundary plan, not a bore code: 08/21, with the 2 mm assembly thickness fixed by the ISO 3031 plan and Ea/Eb 9/20 mm marking the actual needle-contact band. Washer selection is part of the bearing: too-soft faces rib within weeks even though the 7.2 kN rating is unchanged — the AXK code only supplies the rolling elements. Speed planning separates the 5,600 r/min thermal reference from the 11,000 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Grease both faces before assembly so the needles stay in their pockets, especially for the tiny 2 mm thin set; after fitting, rotate slowly and confirm the cage does not catch on the shoulder edges.",
    "applications": [
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces"
    ],
    "failure_modes": [
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "needle-row denting from a single hard particle trapped in the 2 mm section"
    ],
    "pitfalls": [
      "The AXK 0821 TN is watchmaking-scale (2 mm thick, 2 g): handle it with tweezers, grease it onto its washer, and assume one dropped or cocked assembly is one ruined bearing.",
      "the 5,600 r/min reference speed is the thermal criterion under load, the 11,000 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 7.2 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "The AXK code supplies no washers: AXK 0821 TN arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "Match washers by the exact 8–21 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "The 7.2/20 kN ratings and 2 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the AXK 0821 TN code read?",
        "a": "AXK marks the needle thrust assembly and 08/21 gives the inner 8 mm and outer 21 mm track diameters directly; the assembly is 2 mm thick. TN means the polymer cage instead of stamped steel."
      },
      {
        "q": "What minimum hardness do the mating faces need?",
        "a": "58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 7.2 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated."
      },
      {
        "q": "How is an AXK thrust assembly mounted?",
        "a": "Harden or washer-face both tracks across Ea 9–Eb 20 mm, keep faces parallel, locate the cage concentrically against a shoulder or register, grease the needles so they stay pocketed, and never press through them."
      },
      {
        "q": "What are the dimensions and ratings of the AXK 0821 TN?",
        "a": "A AXK 0821 TN measures 8 mm bore × 21 mm outside diameter × 2 mm width (0.315 × 0.827 × 0.079 in). From SKF catalogue PUB BU/P1 17000: dynamic C 7.2 kN, static C0 20 kN, fatigue limit Pu 2.32 kN, reference speed 5,600 r/min, limiting speed 11,000 r/min, mass about 2 g. The contact band runs Ea 9–Eb 20 mm; hardened washers or 58–64 HRC faces are required."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK0821",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK0821-TN",
      "AXK 0821 TN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK1024",
    "brand": "SKF",
    "manufacturer_designation": "AXK 1024",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 10,
    "D_mm": 24,
    "B_mm": 2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8.5,
    "static_load_kN": 26,
    "fatigue_load_limit_kN": 3,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 3,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "SKF's AXK 1024 is not a complete bearing — the stamped steel cage spaces the thrust needles, while hardened AS/LS raceway washers (or shaft and housing faces at 58–64 HRC) provide the two raceways. SKF prints the AXK sizes as adjacent figures, so 10/24 reads 10 then 24 mm; the assembly has no washers of its own — order AS/LS washers or harden the mating faces. The thin section tolerates no misalignment: keep the mating faces parallel, and use the AXW spigot-flanged execution where a one-piece, housing-centred cage-plus-washer unit simplifies assembly. Speed planning separates the 5,300 r/min thermal reference from the 10,000 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Grease both faces before assembly so the needles stay in their pockets, especially for the tiny 2 mm thin set; after fitting, rotate slowly and confirm the cage does not catch on the shoulder edges.",
    "applications": [
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces"
    ],
    "failure_modes": [
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish"
    ],
    "pitfalls": [
      "The AXK 1024 is watchmaking-scale (2 mm thick, 3 g): handle it with tweezers, grease it onto its washer, and assume one dropped or cocked assembly is one ruined bearing.",
      "Match washers by the exact 10–24 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "the 5,300 r/min reference speed is the thermal criterion under load, the 10,000 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 8.5 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "Do not expect misalignment tolerance: a 2 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "The 8.5/26 kN ratings and 3 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why does an AXK assembly fail early?",
        "a": "Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 8.5 kN assumes all of these are correct."
      },
      {
        "q": "Which dimensions does the AXK 1024 have?",
        "a": "A AXK 1024 measures 10 mm bore × 24 mm outside diameter × 2 mm width (0.394 × 0.945 × 0.079 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8.5 kN, static C0 26 kN, fatigue limit Pu 3 kN, reference speed 5,300 r/min, limiting speed 10,000 r/min, mass about 3 g. The contact band runs Ea 12–Eb 23 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "What does AXK 10/24 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 10 mm inner track and 24 mm outer track, 2 mm thick; one-direction axial load, washers ordered separately."
      },
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK1024",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK1024",
      "AXK 1024"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK1226",
    "brand": "SKF",
    "manufacturer_designation": "AXK 1226",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 12,
    "D_mm": 26,
    "B_mm": 2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9.15,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 3.45,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 3,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, AXK 1226 denotes the needle thrust assembly whose code reads the raceway diameters directly — 12/26 — intended to run against hardened, ground washers or machine faces. The designation AXK 1226 identifies a 2 mm needle thrust cage for the 12–26 mm track; the same diameters select the matching hardened washers, which is the usual ordering error to avoid. Washer selection is part of the bearing: too-soft faces rib within weeks even though the 9.15 kN rating is unchanged — the AXK code only supplies the rolling elements. One direction only: AXK 1226 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 14–Eb 25 mm band (or fit AS/LS washers), drop the 2 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face"
    ],
    "failure_modes": [
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "needle-row denting from a single hard particle trapped in the 2 mm section"
    ],
    "pitfalls": [
      "The AXK 1226 is watchmaking-scale (2 mm thick, 3 g): handle it with tweezers, grease it onto its washer, and assume one dropped or cocked assembly is one ruined bearing.",
      "the 5,000 r/min reference speed is the thermal criterion under load, the 10,000 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 9.15 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "The AXK code supplies no washers: AXK 1226 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "Match washers by the exact 12–26 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "The 9.15/30 kN ratings and 3 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What minimum hardness do the mating faces need?",
        "a": "58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 9.15 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated."
      },
      {
        "q": "How is an AXK thrust assembly mounted?",
        "a": "Harden or washer-face both tracks across Ea 14–Eb 25 mm, keep faces parallel, locate the cage concentrically against a shoulder or register, grease the needles so they stay pocketed, and never press through them."
      },
      {
        "q": "What are the dimensions and ratings of the AXK 1226?",
        "a": "A AXK 1226 measures 12 mm bore × 26 mm outside diameter × 2 mm width (0.472 × 1.024 × 0.079 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9.15 kN, static C0 30 kN, fatigue limit Pu 3.45 kN, reference speed 5,000 r/min, limiting speed 10,000 r/min, mass about 3 g. The contact band runs Ea 14–Eb 25 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "Does the AXK 1226 include washers?",
        "a": "No. AXK is the needle roller and cage thrust assembly only; hardened AS/LS washers or shaft/housing faces at 58–64 HRC, ground over the Ea 14–Eb 25 mm band, supply the two raceways."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK1226",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK1226",
      "AXK 1226"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK1528",
    "brand": "SKF",
    "manufacturer_designation": "AXK 1528",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 15,
    "D_mm": 28,
    "B_mm": 2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10.4,
    "static_load_kN": 37.5,
    "fatigue_load_limit_kN": 4.3,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 9500,
    "max_rpm": 9500,
    "weight_g": 4,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "The AXK assembly AXK 1528 covers 15–28 mm in a 2 mm section and is rated 10.4 kN dynamic / 37.5 kN static: the thinnest rolling thrust support available for that seat. In AXK 1528 the number is the boundary plan, not a bore code: 15/28, with the 2 mm assembly thickness fixed by the ISO 3031 plan and Ea/Eb 17/27 mm marking the actual needle-contact band. The thin section tolerates no misalignment: keep the mating faces parallel, and use the AXW spigot-flanged execution where a one-piece, housing-centred cage-plus-washer unit simplifies assembly. Speed planning separates the 4,800 r/min thermal reference from the 9,500 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 17–Eb 27 mm band (or fit AS/LS washers), drop the 2 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces"
    ],
    "failure_modes": [
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "needle-row denting from a single hard particle trapped in the 2 mm section"
    ],
    "pitfalls": [
      "The AXK 1528 is watchmaking-scale (2 mm thick, 4 g): handle it with tweezers, grease it onto its washer, and assume one dropped or cocked assembly is one ruined bearing.",
      "the 4,800 r/min reference speed is the thermal criterion under load, the 9,500 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 10.4 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "The AXK code supplies no washers: AXK 1528 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "Match washers by the exact 15–28 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "The 10.4/37.5 kN ratings and 4 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Does the AXK 1528 include washers?",
        "a": "No. AXK is the needle roller and cage thrust assembly only; hardened AS/LS washers or shaft/housing faces at 58–64 HRC, ground over the Ea 17–Eb 27 mm band, supply the two raceways."
      },
      {
        "q": "How is the AXK 1528 code read?",
        "a": "AXK marks the needle thrust assembly and 15/28 gives the inner 15 mm and outer 28 mm track diameters directly; the assembly is 2 mm thick. TN means the polymer cage instead of stamped steel."
      },
      {
        "q": "What minimum hardness do the mating faces need?",
        "a": "58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 10.4 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated."
      },
      {
        "q": "How is an AXK thrust assembly mounted?",
        "a": "Harden or washer-face both tracks across Ea 17–Eb 27 mm, keep faces parallel, locate the cage concentrically against a shoulder or register, grease the needles so they stay pocketed, and never press through them."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK1528",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK1528",
      "AXK 1528"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK1730",
    "brand": "SKF",
    "manufacturer_designation": "AXK 1730",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 17,
    "D_mm": 30,
    "B_mm": 2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11,
    "static_load_kN": 40.5,
    "fatigue_load_limit_kN": 4.75,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 9500,
    "max_rpm": 9500,
    "weight_g": 3.65,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, AXK 1730 denotes the needle thrust assembly whose code reads the raceway diameters directly — 17/30 — intended to run against hardened, ground washers or machine faces. Reading the code: AXK marks the needle thrust assembly and the figures 17/30 give the two raceway diameters in millimetres — 17 mm inner track and 30 mm outer track; TN swaps the stamped steel cage for PA66. Small AXK sizes are offered with the glass-fibre TN cage or the stamped steel cage; both are 2 mm-class sections. One-direction thrust only. One direction only: AXK 1730 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Grease both faces before assembly so the needles stay in their pockets, especially for the 2 mm thin set; after fitting, rotate slowly and confirm the cage does not catch on the shoulder edges.",
    "applications": [
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face"
    ],
    "failure_modes": [
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "edge loading across the needle crowns when the mating faces are not square to the shaft"
    ],
    "pitfalls": [
      "The AXK 1730 is watchmaking-scale (2 mm thick, 3.65 g): handle it with tweezers, grease it onto its washer, and assume one dropped or cocked assembly is one ruined bearing.",
      "The 11 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "Do not expect misalignment tolerance: a 2 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "TN polymer and stamped steel cages of the same code (AXK 1730) share envelopes and ratings; the choice is temperature and noise, not load.",
      "The AXK code supplies no washers: AXK 1730 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 11/40.5 kN ratings and 3.65 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does AXK 17/30 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 17 mm inner track and 30 mm outer track, 2 mm thick; one-direction axial load, washers ordered separately."
      },
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      },
      {
        "q": "Does the AXK 1730 tolerate misalignment?",
        "a": "No — the 2 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families."
      },
      {
        "q": "Why does an AXK assembly fail early?",
        "a": "Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 11 kN assumes all of these are correct."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK1730",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK1730",
      "AXK 1730"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK2035",
    "brand": "SKF",
    "manufacturer_designation": "AXK 2035",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 20,
    "D_mm": 35,
    "B_mm": 2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12,
    "static_load_kN": 47.5,
    "fatigue_load_limit_kN": 5.6,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 5,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "For transmission gears that would otherwise rub on a housing wall, AXK 2035 supplies a complete needle thrust track between 22 and 34 mm raceway diameters in a 2 mm envelope. In AXK 2035 the number is the boundary plan, not a bore code: 20/35, with the 2 mm assembly thickness fixed by the ISO 3031 plan and Ea/Eb 22/34 mm marking the actual needle-contact band. Small AXK sizes are offered with the glass-fibre TN cage or the stamped steel cage; both are 2 mm-class sections. One-direction thrust only. Selection arithmetic: C 12 kN against C0 47.5 kN gives a C0/C ratio of 3.96 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Grease both faces before assembly so the needles stay in their pockets, especially for the 2 mm thin set; after fitting, rotate slowly and confirm the cage does not catch on the shoulder edges.",
    "applications": [
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots"
    ],
    "failure_modes": [
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "needle-row denting from a single hard particle trapped in the 2 mm section"
    ],
    "pitfalls": [
      "The AXK 2035 is watchmaking-scale (2 mm thick, 5 g): handle it with tweezers, grease it onto its washer, and assume one dropped or cocked assembly is one ruined bearing.",
      "the 4,300 r/min reference speed is the thermal criterion under load, the 8,500 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 12 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "Match washers by the exact 20–35 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "The AXK code supplies no washers: AXK 2035 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 12/47.5 kN ratings and 5 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the AXK 2035?",
        "a": "A AXK 2035 measures 20 mm bore × 35 mm outside diameter × 2 mm width (0.787 × 1.378 × 0.079 in). From SKF catalogue PUB BU/P1 17000: dynamic C 12 kN, static C0 47.5 kN, fatigue limit Pu 5.6 kN, reference speed 4,300 r/min, limiting speed 8,500 r/min, mass about 5 g. The contact band runs Ea 22–Eb 34 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "Does the AXK 2035 include washers?",
        "a": "No. AXK is the needle roller and cage thrust assembly only; hardened AS/LS washers or shaft/housing faces at 58–64 HRC, ground over the Ea 22–Eb 34 mm band, supply the two raceways."
      },
      {
        "q": "How is the AXK 2035 code read?",
        "a": "AXK marks the needle thrust assembly and 20/35 gives the inner 20 mm and outer 35 mm track diameters directly; the assembly is 2 mm thick. TN means the polymer cage instead of stamped steel."
      },
      {
        "q": "What minimum hardness do the mating faces need?",
        "a": "58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 12 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK2035",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK2035",
      "AXK 2035"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK2542",
    "brand": "SKF",
    "manufacturer_designation": "AXK 2542",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 25,
    "D_mm": 42,
    "B_mm": 2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13.4,
    "static_load_kN": 60,
    "fatigue_load_limit_kN": 6.95,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 7,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "SKF's AXK 2542 is not a complete bearing — the stamped steel cage spaces the thrust needles, while hardened AS/LS raceway washers (or shaft and housing faces at 58–64 HRC) provide the two raceways. In AXK 2542 the number is the boundary plan, not a bore code: 25/42, with the 2 mm assembly thickness fixed by the ISO 3031 plan and Ea/Eb 29/41 mm marking the actual needle-contact band. The assembly itself has no rings: both raceways must be supplied as hardened washers or machine faces (58–64 HRC, ground), with the contact band covering Ea 29 to Eb 41 mm. Speed planning separates the 3,800 r/min thermal reference from the 7,500 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 29–Eb 41 mm band (or fit AS/LS washers), drop the 2 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces"
    ],
    "failure_modes": [
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "edge loading across the needle crowns when the mating faces are not square to the shaft"
    ],
    "pitfalls": [
      "On a 25 mm shaft the cage is only 2 mm thick — a shaft shoulder with a sharp edge or a 0.1 mm burr will catch and spin the cage instead of locating it.",
      "The AXK code supplies no washers: AXK 2542 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "Match washers by the exact 25–42 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "Do not expect misalignment tolerance: a 2 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "TN polymer and stamped steel cages of the same code (AXK 2542) share envelopes and ratings; the choice is temperature and noise, not load.",
      "The 13.4/60 kN ratings and 7 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Does the AXK 2542 include washers?",
        "a": "No. AXK is the needle roller and cage thrust assembly only; hardened AS/LS washers or shaft/housing faces at 58–64 HRC, ground over the Ea 29–Eb 41 mm band, supply the two raceways."
      },
      {
        "q": "How is the AXK 2542 code read?",
        "a": "AXK marks the needle thrust assembly and 25/42 gives the inner 25 mm and outer 42 mm track diameters directly; the assembly is 2 mm thick. TN means the polymer cage instead of stamped steel."
      },
      {
        "q": "What minimum hardness do the mating faces need?",
        "a": "58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 13.4 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated."
      },
      {
        "q": "How is an AXK thrust assembly mounted?",
        "a": "Harden or washer-face both tracks across Ea 29–Eb 41 mm, keep faces parallel, locate the cage concentrically against a shoulder or register, grease the needles so they stay pocketed, and never press through them."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK2542",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK2542",
      "AXK 2542"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK3047",
    "brand": "SKF",
    "manufacturer_designation": "AXK 3047",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 30,
    "D_mm": 47,
    "B_mm": 2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15,
    "static_load_kN": 72,
    "fatigue_load_limit_kN": 8.3,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 8,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, AXK 3047 denotes the needle thrust assembly whose code reads the raceway diameters directly — 30/47 — intended to run against hardened, ground washers or machine faces. In AXK 3047 the number is the boundary plan, not a bore code: 30/47, with the 2 mm assembly thickness fixed by the ISO 3031 plan and Ea/Eb 34/46 mm marking the actual needle-contact band. Washer selection is part of the bearing: too-soft faces rib within weeks even though the 15 kN rating is unchanged — the AXK code only supplies the rolling elements. One direction only: AXK 3047 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 34–Eb 46 mm band (or fit AS/LS washers), drop the 2 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face"
    ],
    "failure_modes": [
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "needle-row denting from a single hard particle trapped in the 2 mm section"
    ],
    "pitfalls": [
      "On a 30 mm shaft the cage is only 2 mm thick — a shaft shoulder with a sharp edge or a 0.1 mm burr will catch and spin the cage instead of locating it.",
      "the 3,600 r/min reference speed is the thermal criterion under load, the 7,000 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 15 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "The AXK code supplies no washers: AXK 3047 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "Match washers by the exact 30–47 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "The 15/72 kN ratings and 8 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the AXK 3047?",
        "a": "A AXK 3047 measures 30 mm bore × 47 mm outside diameter × 2 mm width (1.181 × 1.85 × 0.079 in). From SKF catalogue PUB BU/P1 17000: dynamic C 15 kN, static C0 72 kN, fatigue limit Pu 8.3 kN, reference speed 3,600 r/min, limiting speed 7,000 r/min, mass about 8 g. The contact band runs Ea 34–Eb 46 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "Does the AXK 3047 include washers?",
        "a": "No. AXK is the needle roller and cage thrust assembly only; hardened AS/LS washers or shaft/housing faces at 58–64 HRC, ground over the Ea 34–Eb 46 mm band, supply the two raceways."
      },
      {
        "q": "How is the AXK 3047 code read?",
        "a": "AXK marks the needle thrust assembly and 30/47 gives the inner 30 mm and outer 47 mm track diameters directly; the assembly is 2 mm thick. TN means the polymer cage instead of stamped steel."
      },
      {
        "q": "What minimum hardness do the mating faces need?",
        "a": "58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 15 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK3047",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK3047",
      "AXK 3047"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK3552",
    "brand": "SKF",
    "manufacturer_designation": "AXK 3552",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 35,
    "D_mm": 52,
    "B_mm": 2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16.6,
    "static_load_kN": 83,
    "fatigue_load_limit_kN": 9.8,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 10,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "AXK 3552 gives thrust capacity in the height of a shim: 35 mm inner track, 52 mm outer track, only 2 mm thick, with needles held by the stamped steel cage for one-direction axial load. The designation AXK 3552 identifies a 2 mm needle thrust cage for the 35–52 mm track; the same diameters select the matching hardened washers, which is the usual ordering error to avoid. Washer selection is part of the bearing: too-soft faces rib within weeks even though the 16.6 kN rating is unchanged — the AXK code only supplies the rolling elements. Selection arithmetic: C 16.6 kN against C0 83 kN gives a C0/C ratio of 5.00 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 39–Eb 51 mm band (or fit AS/LS washers), drop the 2 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots"
    ],
    "failure_modes": [
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "needle-row denting from a single hard particle trapped in the 2 mm section"
    ],
    "pitfalls": [
      "On a 35 mm shaft the cage is only 2 mm thick — a shaft shoulder with a sharp edge or a 0.1 mm burr will catch and spin the cage instead of locating it.",
      "the 3,200 r/min reference speed is the thermal criterion under load, the 6,300 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 16.6 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "Match washers by the exact 35–52 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "The AXK code supplies no washers: AXK 3552 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 16.6/83 kN ratings and 10 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What minimum hardness do the mating faces need?",
        "a": "58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 16.6 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated."
      },
      {
        "q": "How is an AXK thrust assembly mounted?",
        "a": "Harden or washer-face both tracks across Ea 39–Eb 51 mm, keep faces parallel, locate the cage concentrically against a shoulder or register, grease the needles so they stay pocketed, and never press through them."
      },
      {
        "q": "What are the dimensions and ratings of the AXK 3552?",
        "a": "A AXK 3552 measures 35 mm bore × 52 mm outside diameter × 2 mm width (1.378 × 2.047 × 0.079 in). From SKF catalogue PUB BU/P1 17000: dynamic C 16.6 kN, static C0 83 kN, fatigue limit Pu 9.8 kN, reference speed 3,200 r/min, limiting speed 6,300 r/min, mass about 10 g. The contact band runs Ea 39–Eb 51 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "Does the AXK 3552 include washers?",
        "a": "No. AXK is the needle roller and cage thrust assembly only; hardened AS/LS washers or shaft/housing faces at 58–64 HRC, ground over the Ea 39–Eb 51 mm band, supply the two raceways."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK3552",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK3552",
      "AXK 3552"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK4060",
    "brand": "SKF",
    "manufacturer_designation": "AXK 4060",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 40,
    "D_mm": 60,
    "B_mm": 3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 25,
    "static_load_kN": 114,
    "fatigue_load_limit_kN": 13.7,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 16,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "SKF's AXK 4060 is not a complete bearing — the stamped steel cage spaces the thrust needles, while hardened AS/LS raceway washers (or shaft and housing faces at 58–64 HRC) provide the two raceways. Reading the code: AXK marks the needle thrust assembly and the figures 40/60 give the two raceway diameters in millimetres — 40 mm inner track and 60 mm outer track; TN swaps the stamped steel cage for PA66. The thin section tolerates no misalignment: keep the mating faces parallel, and use the AXW spigot-flanged execution where a one-piece, housing-centred cage-plus-washer unit simplifies assembly. One direction only: AXK 4060 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 45–Eb 58 mm band (or fit AS/LS washers), drop the 3 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face"
    ],
    "failure_modes": [
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish"
    ],
    "pitfalls": [
      "On a 40 mm shaft the cage is only 3 mm thick — a shaft shoulder with a sharp edge or a 0.1 mm burr will catch and spin the cage instead of locating it.",
      "Match washers by the exact 40–60 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "the 2,800 r/min reference speed is the thermal criterion under load, the 5,600 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The AXK code supplies no washers: AXK 4060 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 25 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "The 25/114 kN ratings and 16 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does AXK 40/60 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 40 mm inner track and 60 mm outer track, 3 mm thick; one-direction axial load, washers ordered separately."
      },
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      },
      {
        "q": "Does the AXK 4060 tolerate misalignment?",
        "a": "No — the 3 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families."
      },
      {
        "q": "Why does an AXK assembly fail early?",
        "a": "Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 25 kN assumes all of these are correct."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK4060",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK4060",
      "AXK 4060"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK4565",
    "brand": "SKF",
    "manufacturer_designation": "AXK 4565",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 45,
    "D_mm": 65,
    "B_mm": 3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 27,
    "static_load_kN": 127,
    "fatigue_load_limit_kN": 15.3,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 18,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, AXK 4565 denotes the needle thrust assembly whose code reads the raceway diameters directly — 45/65 — intended to run against hardened, ground washers or machine faces. Reading the code: AXK marks the needle thrust assembly and the figures 45/65 give the two raceway diameters in millimetres — 45 mm inner track and 65 mm outer track; TN swaps the stamped steel cage for PA66. Washer selection is part of the bearing: too-soft faces rib within weeks even though the 27 kN rating is unchanged — the AXK code only supplies the rolling elements. Static safety matters for shock duty: compare peak axial force against C0 127 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 50–Eb 63 mm band (or fit AS/LS washers), drop the 3 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "two-wheeler gearbox selector and layshaft thrust faces",
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars"
    ],
    "failure_modes": [
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish"
    ],
    "pitfalls": [
      "On a 45 mm shaft the cage is only 3 mm thick — a shaft shoulder with a sharp edge or a 0.1 mm burr will catch and spin the cage instead of locating it.",
      "Match washers by the exact 45–65 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "the 2,600 r/min reference speed is the thermal criterion under load, the 5,300 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The AXK code supplies no washers: AXK 4565 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 27 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "The 27/127 kN ratings and 18 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does AXK 45/65 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 45 mm inner track and 65 mm outer track, 3 mm thick; one-direction axial load, washers ordered separately."
      },
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      },
      {
        "q": "Does the AXK 4565 tolerate misalignment?",
        "a": "No — the 3 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families."
      },
      {
        "q": "Why does an AXK assembly fail early?",
        "a": "Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 27 kN assumes all of these are correct."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK4565",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK4565",
      "AXK 4565"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK5070",
    "brand": "SKF",
    "manufacturer_designation": "AXK 5070",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 50,
    "D_mm": 70,
    "B_mm": 3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 28.5,
    "static_load_kN": 143,
    "fatigue_load_limit_kN": 17,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 20,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "AXK 5070 gives thrust capacity in the height of a shim: 50 mm inner track, 70 mm outer track, only 3 mm thick, with needles held by the stamped steel cage for one-direction axial load. SKF prints the AXK sizes as adjacent figures, so 50/70 reads 50 then 70 mm; the assembly has no washers of its own — order AS/LS washers or harden the mating faces. The assembly itself has no rings: both raceways must be supplied as hardened washers or machine faces (58–64 HRC, ground), with the contact band covering Ea 55 to Eb 68 mm. The 20 g mass and 3 mm axial height sit between 50 and 70 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Grease both faces before assembly so the needles stay in their pockets, especially for the 3 mm thin set; after fitting, rotate slowly and confirm the cage does not catch on the shoulder edges.",
    "applications": [
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces",
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions"
    ],
    "failure_modes": [
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "edge loading across the needle crowns when the mating faces are not square to the shaft"
    ],
    "pitfalls": [
      "On a 50 mm shaft the cage is only 3 mm thick — a shaft shoulder with a sharp edge or a 0.1 mm burr will catch and spin the cage instead of locating it.",
      "The 28.5 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "Do not expect misalignment tolerance: a 3 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "The AXK code supplies no washers: AXK 5070 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "Match washers by the exact 50–70 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "The 28.5/143 kN ratings and 20 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      },
      {
        "q": "Does the AXK 5070 tolerate misalignment?",
        "a": "No — the 3 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families."
      },
      {
        "q": "Why does an AXK assembly fail early?",
        "a": "Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 28.5 kN assumes all of these are correct."
      },
      {
        "q": "Which dimensions does the AXK 5070 have?",
        "a": "A AXK 5070 measures 50 mm bore × 70 mm outside diameter × 3 mm width (1.969 × 2.756 × 0.118 in). From SKF catalogue PUB BU/P1 17000: dynamic C 28.5 kN, static C0 143 kN, fatigue limit Pu 17 kN, reference speed 2,400 r/min, limiting speed 5,000 r/min, mass about 20 g. The contact band runs Ea 55–Eb 68 mm; hardened washers or 58–64 HRC faces are required."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK5070",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK5070",
      "AXK 5070"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK5578",
    "brand": "SKF",
    "manufacturer_designation": "AXK 5578",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 55,
    "D_mm": 78,
    "B_mm": 3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 34.5,
    "static_load_kN": 186,
    "fatigue_load_limit_kN": 22.4,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 28,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "The AXK assembly AXK 5578 covers 55–78 mm in a 3 mm section and is rated 34.5 kN dynamic / 186 kN static: the thinnest rolling thrust support available for that seat. Reading the code: AXK marks the needle thrust assembly and the figures 55/78 give the two raceway diameters in millimetres — 55 mm inner track and 78 mm outer track; TN swaps the stamped steel cage for PA66. The thin section tolerates no misalignment: keep the mating faces parallel, and use the AXW spigot-flanged execution where a one-piece, housing-centred cage-plus-washer unit simplifies assembly. Static safety matters for shock duty: compare peak axial force against C0 186 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Keep the assembly concentric with a shaft shoulder or the housing register — a needle set walking radially off its track is the most common failure; the AXW flanged version removes this risk entirely.",
    "applications": [
      "two-wheeler gearbox selector and layshaft thrust faces",
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars"
    ],
    "failure_modes": [
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish"
    ],
    "pitfalls": [
      "On a 55 mm shaft the cage is only 3 mm thick — a shaft shoulder with a sharp edge or a 0.1 mm burr will catch and spin the cage instead of locating it.",
      "Match washers by the exact 55–78 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "the 2,200 r/min reference speed is the thermal criterion under load, the 4,300 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The AXK code supplies no washers: AXK 5578 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 34.5 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "The 34.5/186 kN ratings and 28 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the AXK 5578 have?",
        "a": "A AXK 5578 measures 55 mm bore × 78 mm outside diameter × 3 mm width (2.165 × 3.071 × 0.118 in). From SKF catalogue PUB BU/P1 17000: dynamic C 34.5 kN, static C0 186 kN, fatigue limit Pu 22.4 kN, reference speed 2,200 r/min, limiting speed 4,300 r/min, mass about 28 g. The contact band runs Ea 60–Eb 76 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "What does AXK 55/78 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 55 mm inner track and 78 mm outer track, 3 mm thick; one-direction axial load, washers ordered separately."
      },
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      },
      {
        "q": "Does the AXK 5578 tolerate misalignment?",
        "a": "No — the 3 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK5578",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK5578",
      "AXK 5578"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK6085",
    "brand": "SKF",
    "manufacturer_designation": "AXK 6085",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 60,
    "D_mm": 85,
    "B_mm": 3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 37.5,
    "static_load_kN": 232,
    "fatigue_load_limit_kN": 28.5,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 33,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "For transmission gears that would otherwise rub on a housing wall, AXK 6085 supplies a complete needle thrust track between 65 and 83 mm raceway diameters in a 3 mm envelope. Reading the code: AXK marks the needle thrust assembly and the figures 60/85 give the two raceway diameters in millimetres — 60 mm inner track and 85 mm outer track; TN swaps the stamped steel cage for PA66. At this size the stamped steel cage guides long thrust needles; the TN polymer-cage variant is offered where noise matters. One-direction thrust only. The 33 g mass and 3 mm axial height sit between 60 and 85 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 65–Eb 83 mm band (or fit AS/LS washers), drop the 3 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces",
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions"
    ],
    "failure_modes": [
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish"
    ],
    "pitfalls": [
      "On a 60 mm shaft the cage is only 3 mm thick — a shaft shoulder with a sharp edge or a 0.1 mm burr will catch and spin the cage instead of locating it.",
      "Match washers by the exact 60–85 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "the 2,200 r/min reference speed is the thermal criterion under load, the 4,300 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "TN polymer and stamped steel cages of the same code (AXK 6085) share envelopes and ratings; the choice is temperature and noise, not load.",
      "The AXK code supplies no washers: AXK 6085 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 37.5/232 kN ratings and 33 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why does an AXK assembly fail early?",
        "a": "Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 37.5 kN assumes all of these are correct."
      },
      {
        "q": "Which dimensions does the AXK 6085 have?",
        "a": "A AXK 6085 measures 60 mm bore × 85 mm outside diameter × 3 mm width (2.362 × 3.346 × 0.118 in). From SKF catalogue PUB BU/P1 17000: dynamic C 37.5 kN, static C0 232 kN, fatigue limit Pu 28.5 kN, reference speed 2,200 r/min, limiting speed 4,300 r/min, mass about 33 g. The contact band runs Ea 65–Eb 83 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "What does AXK 60/85 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 60 mm inner track and 85 mm outer track, 3 mm thick; one-direction axial load, washers ordered separately."
      },
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK6085",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK6085",
      "AXK 6085"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK6590",
    "brand": "SKF",
    "manufacturer_designation": "AXK 6590",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 65,
    "D_mm": 90,
    "B_mm": 3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 39,
    "static_load_kN": 255,
    "fatigue_load_limit_kN": 31,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 35,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "AXK 6590 is a needle roller and cage thrust assembly to ISO 3031: a 3 mm thin cage packing the maximum number of small needles for a 65 mm shaft raceway and 90 mm outside track, as listed in SKF catalogue PUB BU/P1 17000 ch. 12.1. The designation AXK 6590 identifies a 3 mm needle thrust cage for the 65–90 mm track; the same diameters select the matching hardened washers, which is the usual ordering error to avoid. At this size the stamped steel cage guides long thrust needles; the TN polymer-cage variant is offered where noise matters. One-direction thrust only. The 35 g mass and 3 mm axial height sit between 65 and 90 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 70–Eb 88 mm band (or fit AS/LS washers), drop the 3 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces",
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions"
    ],
    "failure_modes": [
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "edge loading across the needle crowns when the mating faces are not square to the shaft"
    ],
    "pitfalls": [
      "At 65 mm track diameter, face hardness decides everything: a ground-but-soft washer looks correct yet ribbons within months; specify 58–64 HRC on the drawing.",
      "The AXK code supplies no washers: AXK 6590 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "Match washers by the exact 65–90 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "the 2,000 r/min reference speed is the thermal criterion under load, the 4,000 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 39 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "The 39/255 kN ratings and 35 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the AXK 6590 code read?",
        "a": "AXK marks the needle thrust assembly and 65/90 gives the inner 65 mm and outer 90 mm track diameters directly; the assembly is 3 mm thick. TN means the polymer cage instead of stamped steel."
      },
      {
        "q": "What minimum hardness do the mating faces need?",
        "a": "58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 39 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated."
      },
      {
        "q": "How is an AXK thrust assembly mounted?",
        "a": "Harden or washer-face both tracks across Ea 70–Eb 88 mm, keep faces parallel, locate the cage concentrically against a shoulder or register, grease the needles so they stay pocketed, and never press through them."
      },
      {
        "q": "What are the dimensions and ratings of the AXK 6590?",
        "a": "A AXK 6590 measures 65 mm bore × 90 mm outside diameter × 3 mm width (2.559 × 3.543 × 0.118 in). From SKF catalogue PUB BU/P1 17000: dynamic C 39 kN, static C0 255 kN, fatigue limit Pu 31 kN, reference speed 2,000 r/min, limiting speed 4,000 r/min, mass about 35 g. The contact band runs Ea 70–Eb 88 mm; hardened washers or 58–64 HRC faces are required."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK6590",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK6590",
      "AXK 6590"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK7095",
    "brand": "SKF",
    "manufacturer_designation": "AXK 7095",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 70,
    "D_mm": 95,
    "B_mm": 4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 49,
    "static_load_kN": 255,
    "fatigue_load_limit_kN": 31,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 60,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "The AXK assembly AXK 7095 covers 70–95 mm in a 4 mm section and is rated 49 kN dynamic / 255 kN static: the thinnest rolling thrust support available for that seat. SKF prints the AXK sizes as adjacent figures, so 70/95 reads 70 then 95 mm; the assembly has no washers of its own — order AS/LS washers or harden the mating faces. The thin section tolerates no misalignment: keep the mating faces parallel, and use the AXW spigot-flanged execution where a one-piece, housing-centred cage-plus-washer unit simplifies assembly. No factor A is published for needle thrust sets: keep a light preload so the needles roll rather than skid — springs, shim preload or the gear's own backlash take-up are part of the selection, not an accessory. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 74–Eb 93 mm band (or fit AS/LS washers), drop the 4 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces",
      "compact drives where hardened washers replace a machined raceway shoulder"
    ],
    "failure_modes": [
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "edge loading across the needle crowns when the mating faces are not square to the shaft"
    ],
    "pitfalls": [
      "At 70 mm track diameter, face hardness decides everything: a ground-but-soft washer looks correct yet ribbons within months; specify 58–64 HRC on the drawing.",
      "The 49 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "Do not expect misalignment tolerance: a 4 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "the 1,800 r/min reference speed is the thermal criterion under load, the 3,600 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The AXK code supplies no washers: AXK 7095 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 49/255 kN ratings and 60 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does AXK 70/95 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 70 mm inner track and 95 mm outer track, 4 mm thick; one-direction axial load, washers ordered separately."
      },
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      },
      {
        "q": "Does the AXK 7095 tolerate misalignment?",
        "a": "No — the 4 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families."
      },
      {
        "q": "Why does an AXK assembly fail early?",
        "a": "Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 49 kN assumes all of these are correct."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK7095",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK7095",
      "AXK 7095"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK75100",
    "brand": "SKF",
    "manufacturer_designation": "AXK 75100",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 75,
    "D_mm": 100,
    "B_mm": 4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 50,
    "static_load_kN": 265,
    "fatigue_load_limit_kN": 32.5,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 61,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, AXK 75100 denotes the needle thrust assembly whose code reads the raceway diameters directly — 75/100 — intended to run against hardened, ground washers or machine faces. Reading the code: AXK marks the needle thrust assembly and the figures 75/100 give the two raceway diameters in millimetres — 75 mm inner track and 100 mm outer track; TN swaps the stamped steel cage for PA66. The thin section tolerates no misalignment: keep the mating faces parallel, and use the AXW spigot-flanged execution where a one-piece, housing-centred cage-plus-washer unit simplifies assembly. Speed planning separates the 1,700 r/min thermal reference from the 3,400 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Keep the assembly concentric with a shaft shoulder or the housing register — a needle set walking radially off its track is the most common failure; the AXW flanged version removes this risk entirely.",
    "applications": [
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces"
    ],
    "failure_modes": [
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "edge loading across the needle crowns when the mating faces are not square to the shaft"
    ],
    "pitfalls": [
      "At 75 mm track diameter, face hardness decides everything: a ground-but-soft washer looks correct yet ribbons within months; specify 58–64 HRC on the drawing.",
      "The 50 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "Do not expect misalignment tolerance: a 4 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "Match washers by the exact 75–100 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "the 1,700 r/min reference speed is the thermal criterion under load, the 3,400 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 50/265 kN ratings and 61 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      },
      {
        "q": "Does the AXK 75100 tolerate misalignment?",
        "a": "No — the 4 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families."
      },
      {
        "q": "Why does an AXK assembly fail early?",
        "a": "Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 50 kN assumes all of these are correct."
      },
      {
        "q": "Which dimensions does the AXK 75100 have?",
        "a": "A AXK 75100 measures 75 mm bore × 100 mm outside diameter × 4 mm width (2.953 × 3.937 × 0.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 50 kN, static C0 265 kN, fatigue limit Pu 32.5 kN, reference speed 1,700 r/min, limiting speed 3,400 r/min, mass about 61 g. The contact band runs Ea 79–Eb 98 mm; hardened washers or 58–64 HRC faces are required."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK75100",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK75100",
      "AXK 75100"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK80105",
    "brand": "SKF",
    "manufacturer_designation": "AXK 80105",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 80,
    "D_mm": 105,
    "B_mm": 4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 51,
    "static_load_kN": 280,
    "fatigue_load_limit_kN": 34,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 63,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "AXK 80105 gives thrust capacity in the height of a shim: 80 mm inner track, 105 mm outer track, only 4 mm thick, with needles held by the stamped steel cage for one-direction axial load. In AXK 80105 the number is the boundary plan, not a bore code: 80/105, with the 4 mm assembly thickness fixed by the ISO 3031 plan and Ea/Eb 84/103 mm marking the actual needle-contact band. The thin section tolerates no misalignment: keep the mating faces parallel, and use the AXW spigot-flanged execution where a one-piece, housing-centred cage-plus-washer unit simplifies assembly. The 63 g mass and 4 mm axial height sit between 80 and 105 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 84–Eb 103 mm band (or fit AS/LS washers), drop the 4 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces",
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions"
    ],
    "failure_modes": [
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "needle-row denting from a single hard particle trapped in the 2 mm section"
    ],
    "pitfalls": [
      "At 80 mm track diameter, face hardness decides everything: a ground-but-soft washer looks correct yet ribbons within months; specify 58–64 HRC on the drawing.",
      "the 1,700 r/min reference speed is the thermal criterion under load, the 3,400 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 51 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "Do not expect misalignment tolerance: a 4 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "TN polymer and stamped steel cages of the same code (AXK 80105) share envelopes and ratings; the choice is temperature and noise, not load.",
      "The 51/280 kN ratings and 63 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is an AXK thrust assembly mounted?",
        "a": "Harden or washer-face both tracks across Ea 84–Eb 103 mm, keep faces parallel, locate the cage concentrically against a shoulder or register, grease the needles so they stay pocketed, and never press through them."
      },
      {
        "q": "What are the dimensions and ratings of the AXK 80105?",
        "a": "A AXK 80105 measures 80 mm bore × 105 mm outside diameter × 4 mm width (3.15 × 4.134 × 0.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 51 kN, static C0 280 kN, fatigue limit Pu 34 kN, reference speed 1,700 r/min, limiting speed 3,400 r/min, mass about 63 g. The contact band runs Ea 84–Eb 103 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "Does the AXK 80105 include washers?",
        "a": "No. AXK is the needle roller and cage thrust assembly only; hardened AS/LS washers or shaft/housing faces at 58–64 HRC, ground over the Ea 84–Eb 103 mm band, supply the two raceways."
      },
      {
        "q": "How is the AXK 80105 code read?",
        "a": "AXK marks the needle thrust assembly and 80/105 gives the inner 80 mm and outer 105 mm track diameters directly; the assembly is 4 mm thick. TN means the polymer cage instead of stamped steel."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK80105",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK80105",
      "AXK 80105"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK85110",
    "brand": "SKF",
    "manufacturer_designation": "AXK 85110",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 85,
    "D_mm": 110,
    "B_mm": 4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 52,
    "static_load_kN": 290,
    "fatigue_load_limit_kN": 35.5,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 67,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "For transmission gears that would otherwise rub on a housing wall, AXK 85110 supplies a complete needle thrust track between 89 and 108 mm raceway diameters in a 4 mm envelope. Reading the code: AXK marks the needle thrust assembly and the figures 85/110 give the two raceway diameters in millimetres — 85 mm inner track and 110 mm outer track; TN swaps the stamped steel cage for PA66. At this size the stamped steel cage guides long thrust needles; the TN polymer-cage variant is offered where noise matters. One-direction thrust only. One direction only: AXK 85110 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 89–Eb 108 mm band (or fit AS/LS washers), drop the 4 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face"
    ],
    "failure_modes": [
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "edge loading across the needle crowns when the mating faces are not square to the shaft"
    ],
    "pitfalls": [
      "At 85 mm track diameter, face hardness decides everything: a ground-but-soft washer looks correct yet ribbons within months; specify 58–64 HRC on the drawing.",
      "The 52 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "Do not expect misalignment tolerance: a 4 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "TN polymer and stamped steel cages of the same code (AXK 85110) share envelopes and ratings; the choice is temperature and noise, not load.",
      "The AXK code supplies no washers: AXK 85110 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 52/290 kN ratings and 67 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 908); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the AXK 85110 have?",
        "a": "A AXK 85110 measures 85 mm bore × 110 mm outside diameter × 4 mm width (3.346 × 4.331 × 0.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 52 kN, static C0 290 kN, fatigue limit Pu 35.5 kN, reference speed 1,700 r/min, limiting speed 3,400 r/min, mass about 67 g. The contact band runs Ea 89–Eb 108 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "What does AXK 85/110 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 85 mm inner track and 110 mm outer track, 4 mm thick; one-direction axial load, washers ordered separately."
      },
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      },
      {
        "q": "Does the AXK 85110 tolerate misalignment?",
        "a": "No — the 4 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK85110",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK85110",
      "AXK 85110"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK90120",
    "brand": "SKF",
    "manufacturer_designation": "AXK 90120",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 90,
    "D_mm": 120,
    "B_mm": 4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 65.5,
    "static_load_kN": 405,
    "fatigue_load_limit_kN": 49,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "weight_g": 86,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, AXK 90120 denotes the needle thrust assembly whose code reads the raceway diameters directly — 90/120 — intended to run against hardened, ground washers or machine faces. SKF prints the AXK sizes as adjacent figures, so 90/120 reads 90 then 120 mm; the assembly has no washers of its own — order AS/LS washers or harden the mating faces. The thin section tolerates no misalignment: keep the mating faces parallel, and use the AXW spigot-flanged execution where a one-piece, housing-centred cage-plus-washer unit simplifies assembly. One direction only: AXK 90120 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Keep the assembly concentric with a shaft shoulder or the housing register — a needle set walking radially off its track is the most common failure; the AXW flanged version removes this risk entirely.",
    "applications": [
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face"
    ],
    "failure_modes": [
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish"
    ],
    "pitfalls": [
      "At 90 mm track diameter, face hardness decides everything: a ground-but-soft washer looks correct yet ribbons within months; specify 58–64 HRC on the drawing.",
      "Match washers by the exact 90–120 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "the 1,500 r/min reference speed is the thermal criterion under load, the 3,000 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The AXK code supplies no washers: AXK 90120 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 65.5 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "The 65.5/405 kN ratings and 86 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 910); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Does the AXK 90120 tolerate misalignment?",
        "a": "No — the 4 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families."
      },
      {
        "q": "Why does an AXK assembly fail early?",
        "a": "Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 65.5 kN assumes all of these are correct."
      },
      {
        "q": "Which dimensions does the AXK 90120 have?",
        "a": "A AXK 90120 measures 90 mm bore × 120 mm outside diameter × 4 mm width (3.543 × 4.724 × 0.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 65.5 kN, static C0 405 kN, fatigue limit Pu 49 kN, reference speed 1,500 r/min, limiting speed 3,000 r/min, mass about 86 g. The contact band runs Ea 94–Eb 118 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "What does AXK 90/120 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 90 mm inner track and 120 mm outer track, 4 mm thick; one-direction axial load, washers ordered separately."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK90120",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK90120",
      "AXK 90120"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK100135",
    "brand": "SKF",
    "manufacturer_designation": "AXK 100135",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 100,
    "D_mm": 135,
    "B_mm": 4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 76.5,
    "static_load_kN": 560,
    "fatigue_load_limit_kN": 65.5,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 104,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "SKF's AXK 100135 is not a complete bearing — the stamped steel cage spaces the thrust needles, while hardened AS/LS raceway washers (or shaft and housing faces at 58–64 HRC) provide the two raceways. Reading the code: AXK marks the needle thrust assembly and the figures 100/135 give the two raceway diameters in millimetres — 100 mm inner track and 135 mm outer track; TN swaps the stamped steel cage for PA66. The thin section tolerates no misalignment: keep the mating faces parallel, and use the AXW spigot-flanged execution where a one-piece, housing-centred cage-plus-washer unit simplifies assembly. Speed planning separates the 1,400 r/min thermal reference from the 2,800 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Keep the assembly concentric with a shaft shoulder or the housing register — a needle set walking radially off its track is the most common failure; the AXW flanged version removes this risk entirely.",
    "applications": [
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces"
    ],
    "failure_modes": [
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "needle-row denting from a single hard particle trapped in the 2 mm section"
    ],
    "pitfalls": [
      "At 100 mm track diameter, face hardness decides everything: a ground-but-soft washer looks correct yet ribbons within months; specify 58–64 HRC on the drawing.",
      "TN polymer and stamped steel cages of the same code (AXK 100135) share envelopes and ratings; the choice is temperature and noise, not load.",
      "The AXK code supplies no washers: AXK 100135 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "Match washers by the exact 100–135 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "the 1,400 r/min reference speed is the thermal criterion under load, the 2,800 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 76.5/560 kN ratings and 104 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 910); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why does an AXK assembly fail early?",
        "a": "Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 76.5 kN assumes all of these are correct."
      },
      {
        "q": "Which dimensions does the AXK 100135 have?",
        "a": "A AXK 100135 measures 100 mm bore × 135 mm outside diameter × 4 mm width (3.937 × 5.315 × 0.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 76.5 kN, static C0 560 kN, fatigue limit Pu 65.5 kN, reference speed 1,400 r/min, limiting speed 2,800 r/min, mass about 104 g. The contact band runs Ea 105–Eb 133 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "What does AXK 100/135 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 100 mm inner track and 135 mm outer track, 4 mm thick; one-direction axial load, washers ordered separately."
      },
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK100135",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK100135",
      "AXK 100135"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK110145",
    "brand": "SKF",
    "manufacturer_designation": "AXK 110145",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 110,
    "D_mm": 145,
    "B_mm": 4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 81.5,
    "static_load_kN": 620,
    "fatigue_load_limit_kN": 72,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 122,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "The AXK assembly AXK 110145 covers 110–145 mm in a 4 mm section and is rated 81.5 kN dynamic / 620 kN static: the thinnest rolling thrust support available for that seat. Reading the code: AXK marks the needle thrust assembly and the figures 110/145 give the two raceway diameters in millimetres — 110 mm inner track and 145 mm outer track; TN swaps the stamped steel cage for PA66. The assembly itself has no rings: both raceways must be supplied as hardened washers or machine faces (58–64 HRC, ground), with the contact band covering Ea 115 to Eb 143 mm. One direction only: AXK 110145 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Keep the assembly concentric with a shaft shoulder or the housing register — a needle set walking radially off its track is the most common failure; the AXW flanged version removes this risk entirely.",
    "applications": [
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face"
    ],
    "failure_modes": [
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "needle-row denting from a single hard particle trapped in the 2 mm section"
    ],
    "pitfalls": [
      "At 110 mm track diameter, face hardness decides everything: a ground-but-soft washer looks correct yet ribbons within months; specify 58–64 HRC on the drawing.",
      "TN polymer and stamped steel cages of the same code (AXK 110145) share envelopes and ratings; the choice is temperature and noise, not load.",
      "The AXK code supplies no washers: AXK 110145 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 81.5 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "Do not expect misalignment tolerance: a 4 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "The 81.5/620 kN ratings and 122 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 910); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      },
      {
        "q": "Does the AXK 110145 tolerate misalignment?",
        "a": "No — the 4 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families."
      },
      {
        "q": "Why does an AXK assembly fail early?",
        "a": "Almost always the track: missing/undersized washers, hardness below 58 HRC, a sharp shoulder edge catching the cage, or contamination in the thin section. Rating 81.5 kN assumes all of these are correct."
      },
      {
        "q": "Which dimensions does the AXK 110145 have?",
        "a": "A AXK 110145 measures 110 mm bore × 145 mm outside diameter × 4 mm width (4.331 × 5.709 × 0.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 81.5 kN, static C0 620 kN, fatigue limit Pu 72 kN, reference speed 1,300 r/min, limiting speed 2,600 r/min, mass about 122 g. The contact band runs Ea 115–Eb 143 mm; hardened washers or 58–64 HRC faces are required."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK110145",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK110145",
      "AXK 110145"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK120155",
    "brand": "SKF",
    "manufacturer_designation": "AXK 120155",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 120,
    "D_mm": 155,
    "B_mm": 4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 86.5,
    "static_load_kN": 680,
    "fatigue_load_limit_kN": 76.5,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 131,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, AXK 120155 denotes the needle thrust assembly whose code reads the raceway diameters directly — 120/155 — intended to run against hardened, ground washers or machine faces. Reading the code: AXK marks the needle thrust assembly and the figures 120/155 give the two raceway diameters in millimetres — 120 mm inner track and 155 mm outer track; TN swaps the stamped steel cage for PA66. At this size the stamped steel cage guides long thrust needles; the TN polymer-cage variant is offered where noise matters. One-direction thrust only. The 131 g mass and 4 mm axial height sit between 120 and 155 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Keep the assembly concentric with a shaft shoulder or the housing register — a needle set walking radially off its track is the most common failure; the AXW flanged version removes this risk entirely.",
    "applications": [
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces",
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions"
    ],
    "failure_modes": [
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "needle-row denting from a single hard particle trapped in the 2 mm section"
    ],
    "pitfalls": [
      "Above 110 mm the large AXK sets (120–155 mm) are assembled standing up in vertical gearboxes — retain the cage or it walks off its track before the first bolt is torqued.",
      "TN polymer and stamped steel cages of the same code (AXK 120155) share envelopes and ratings; the choice is temperature and noise, not load.",
      "The AXK code supplies no washers: AXK 120155 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "Match washers by the exact 120–155 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,600 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 86.5/680 kN ratings and 131 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 910); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the AXK 120155 have?",
        "a": "A AXK 120155 measures 120 mm bore × 155 mm outside diameter × 4 mm width (4.724 × 6.102 × 0.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 86.5 kN, static C0 680 kN, fatigue limit Pu 76.5 kN, reference speed 1,300 r/min, limiting speed 2,600 r/min, mass about 131 g. The contact band runs Ea 125–Eb 153 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "What does AXK 120/155 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 120 mm inner track and 155 mm outer track, 4 mm thick; one-direction axial load, washers ordered separately."
      },
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      },
      {
        "q": "Does the AXK 120155 tolerate misalignment?",
        "a": "No — the 4 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK120155",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK120155",
      "AXK 120155"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK130170",
    "brand": "SKF",
    "manufacturer_designation": "AXK 130170",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 130,
    "D_mm": 170,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 112,
    "static_load_kN": 830,
    "fatigue_load_limit_kN": 93,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 205,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "The AXK assembly AXK 130170 covers 130–170 mm in a 5 mm section and is rated 112 kN dynamic / 830 kN static: the thinnest rolling thrust support available for that seat. In AXK 130170 the number is the boundary plan, not a bore code: 130/170, with the 5 mm assembly thickness fixed by the ISO 3031 plan and Ea/Eb 136/167 mm marking the actual needle-contact band. Washer selection is part of the bearing: too-soft faces rib within weeks even though the 112 kN rating is unchanged — the AXK code only supplies the rolling elements. Selection arithmetic: C 112 kN against C0 830 kN gives a C0/C ratio of 7.41 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: harden and grind both mating faces to 58–64 HRC over the full Ea 136–Eb 167 mm band (or fit AS/LS washers), drop the 5 mm cage in flat, and never press or hammer the needle complement.",
    "applications": [
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots"
    ],
    "failure_modes": [
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish"
    ],
    "pitfalls": [
      "Above 110 mm the large AXK sets (130–170 mm) are assembled standing up in vertical gearboxes — retain the cage or it walks off its track before the first bolt is torqued.",
      "Do not expect misalignment tolerance: a 5 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "TN polymer and stamped steel cages of the same code (AXK 130170) share envelopes and ratings; the choice is temperature and noise, not load.",
      "The AXK code supplies no washers: AXK 130170 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "Match washers by the exact 130–170 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "The 112/830 kN ratings and 205 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 910); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the AXK 130170?",
        "a": "A AXK 130170 measures 130 mm bore × 170 mm outside diameter × 5 mm width (5.118 × 6.693 × 0.197 in). From SKF catalogue PUB BU/P1 17000: dynamic C 112 kN, static C0 830 kN, fatigue limit Pu 93 kN, reference speed 1,100 r/min, limiting speed 2,200 r/min, mass about 205 g. The contact band runs Ea 136–Eb 167 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "Does the AXK 130170 include washers?",
        "a": "No. AXK is the needle roller and cage thrust assembly only; hardened AS/LS washers or shaft/housing faces at 58–64 HRC, ground over the Ea 136–Eb 167 mm band, supply the two raceways."
      },
      {
        "q": "How is the AXK 130170 code read?",
        "a": "AXK marks the needle thrust assembly and 130/170 gives the inner 130 mm and outer 170 mm track diameters directly; the assembly is 5 mm thick. TN means the polymer cage instead of stamped steel."
      },
      {
        "q": "What minimum hardness do the mating faces need?",
        "a": "58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 112 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK130170",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK130170",
      "AXK 130170"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK140180",
    "brand": "SKF",
    "manufacturer_designation": "AXK 140180",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 140,
    "D_mm": 180,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 116,
    "static_load_kN": 900,
    "fatigue_load_limit_kN": 96.5,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 219,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, AXK 140180 denotes the needle thrust assembly whose code reads the raceway diameters directly — 140/180 — intended to run against hardened, ground washers or machine faces. In AXK 140180 the number is the boundary plan, not a bore code: 140/180, with the 5 mm assembly thickness fixed by the ISO 3031 plan and Ea/Eb 146/177 mm marking the actual needle-contact band. Washer selection is part of the bearing: too-soft faces rib within weeks even though the 116 kN rating is unchanged — the AXK code only supplies the rolling elements. The 219 g mass and 5 mm axial height sit between 140 and 180 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Grease both faces before assembly so the needles stay in their pockets, especially for the 5 mm thin set; after fitting, rotate slowly and confirm the cage does not catch on the shoulder edges.",
    "applications": [
      "light turntables, index plates and office-machine pivots",
      "two-wheeler gearbox selector and layshaft thrust faces",
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions"
    ],
    "failure_modes": [
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish"
    ],
    "pitfalls": [
      "Above 110 mm the large AXK sets (140–180 mm) are assembled standing up in vertical gearboxes — retain the cage or it walks off its track before the first bolt is torqued.",
      "Do not expect misalignment tolerance: a 5 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "TN polymer and stamped steel cages of the same code (AXK 140180) share envelopes and ratings; the choice is temperature and noise, not load.",
      "the 1,000 r/min reference speed is the thermal criterion under load, the 2,000 r/min limiting speed assumes hardened, ground, oiled faces; soft or dry faces drop the real ceiling drastically.",
      "The 116 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "The 116/900 kN ratings and 219 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 910); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the AXK 140180 code read?",
        "a": "AXK marks the needle thrust assembly and 140/180 gives the inner 140 mm and outer 180 mm track diameters directly; the assembly is 5 mm thick. TN means the polymer cage instead of stamped steel."
      },
      {
        "q": "What minimum hardness do the mating faces need?",
        "a": "58–64 HRC with a ground raceway finish. A softer face looks fine after assembly but the needles rib and score it within weeks despite the 116 kN catalogue rating — order certified washers if the shaft/housing cannot be heat treated."
      },
      {
        "q": "How is an AXK thrust assembly mounted?",
        "a": "Harden or washer-face both tracks across Ea 146–Eb 177 mm, keep faces parallel, locate the cage concentrically against a shoulder or register, grease the needles so they stay pocketed, and never press through them."
      },
      {
        "q": "What are the dimensions and ratings of the AXK 140180?",
        "a": "A AXK 140180 measures 140 mm bore × 180 mm outside diameter × 5 mm width (5.512 × 7.087 × 0.197 in). From SKF catalogue PUB BU/P1 17000: dynamic C 116 kN, static C0 900 kN, fatigue limit Pu 96.5 kN, reference speed 1,000 r/min, limiting speed 2,000 r/min, mass about 219 g. The contact band runs Ea 146–Eb 177 mm; hardened washers or 58–64 HRC faces are required."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK140180",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK140180",
      "AXK 140180"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK150190",
    "brand": "SKF",
    "manufacturer_designation": "AXK 150190",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 150,
    "D_mm": 190,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 120,
    "static_load_kN": 950,
    "fatigue_load_limit_kN": 102,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 232,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "AXK 150190 gives thrust capacity in the height of a shim: 150 mm inner track, 190 mm outer track, only 5 mm thick, with needles held by the stamped steel cage for one-direction axial load. SKF prints the AXK sizes as adjacent figures, so 150/190 reads 150 then 190 mm; the assembly has no washers of its own — order AS/LS washers or harden the mating faces. The thin section tolerates no misalignment: keep the mating faces parallel, and use the AXW spigot-flanged execution where a one-piece, housing-centred cage-plus-washer unit simplifies assembly. Selection arithmetic: C 120 kN against C0 950 kN gives a C0/C ratio of 7.92 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Grease both faces before assembly so the needles stay in their pockets, especially for the 5 mm thin set; after fitting, rotate slowly and confirm the cage does not catch on the shoulder edges.",
    "applications": [
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars",
      "small gearbox gears that need a 2 mm thrust shim between a shaft and face",
      "light turntables, index plates and office-machine pivots"
    ],
    "failure_modes": [
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "edge loading across the needle crowns when the mating faces are not square to the shaft"
    ],
    "pitfalls": [
      "Above 110 mm the large AXK sets (150–190 mm) are assembled standing up in vertical gearboxes — retain the cage or it walks off its track before the first bolt is torqued.",
      "The 120 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "Do not expect misalignment tolerance: a 5 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "The AXK code supplies no washers: AXK 150190 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "Match washers by the exact 150–190 mm track — a washer sized to the shaft alone leaves the needles overrunning its edge, which shears the cage.",
      "The 120/950 kN ratings and 232 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 910); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the AXK 150190 have?",
        "a": "A AXK 150190 measures 150 mm bore × 190 mm outside diameter × 5 mm width (5.906 × 7.48 × 0.197 in). From SKF catalogue PUB BU/P1 17000: dynamic C 120 kN, static C0 950 kN, fatigue limit Pu 102 kN, reference speed 1,000 r/min, limiting speed 2,000 r/min, mass about 232 g. The contact band runs Ea 156–Eb 187 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "What does AXK 150/190 mean?",
        "a": "A needle roller and cage thrust assembly (ISO 3031) for a 150 mm inner track and 190 mm outer track, 5 mm thick; one-direction axial load, washers ordered separately."
      },
      {
        "q": "What is the difference between AXK and AXW?",
        "a": "AXW pairs the AXK needle set with a washer carrying an integral centring spigot that locates in a housing register, keeping cage and washer concentric as one part; AXK is the bare cage-and-needle set needing two separate washers. The AXW still needs a separate LS/AS washer or hardened face on the opposite side."
      },
      {
        "q": "Does the AXK 150190 tolerate misalignment?",
        "a": "No — the 5 mm rigid needle set edge-loads on tilted faces. Keep the shaft and housing faces parallel, or choose the self-aligning roller thrust families."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK150190",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK150190",
      "AXK 150190"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXK160200",
    "brand": "SKF",
    "manufacturer_designation": "AXK 160200",
    "series": "AXK-series",
    "type": "needle_roller_thrust",
    "d_mm": 160,
    "D_mm": 200,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 125,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 106,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "weight_g": 246,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "The AXK assembly AXK 160200 covers 160–200 mm in a 5 mm section and is rated 125 kN dynamic / 1000 kN static: the thinnest rolling thrust support available for that seat. In AXK 160200 the number is the boundary plan, not a bore code: 160/200, with the 5 mm assembly thickness fixed by the ISO 3031 plan and Ea/Eb 166/197 mm marking the actual needle-contact band. The assembly itself has no rings: both raceways must be supplied as hardened washers or machine faces (58–64 HRC, ground), with the contact band covering Ea 166 to Eb 197 mm. Static safety matters for shock duty: compare peak axial force against C0 1000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Keep the assembly concentric with a shaft shoulder or the housing register — a needle set walking radially off its track is the most common failure; the AXW flanged version removes this risk entirely.",
    "applications": [
      "two-wheeler gearbox selector and layshaft thrust faces",
      "compact drives where hardened washers replace a machined raceway shoulder",
      "automotive manual and automatic transmission thrust positions",
      "torque converter and clutch release assemblies in passenger cars"
    ],
    "failure_modes": [
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish"
    ],
    "pitfalls": [
      "Above 110 mm the large AXK sets (160–200 mm) are assembled standing up in vertical gearboxes — retain the cage or it walks off its track before the first bolt is torqued.",
      "Do not expect misalignment tolerance: a 5 mm rigid needle set edge-loads if the faces tilt even a fraction of a degree — use a spherical or AXW solution where the seat cannot be kept parallel.",
      "TN polymer and stamped steel cages of the same code (AXK 160200) share envelopes and ratings; the choice is temperature and noise, not load.",
      "The 125 kN rating is real only at 58–64 HRC face hardness; visual inspection cannot tell a 45 HRC washer from a 60 HRC one — order certified washers.",
      "The AXK code supplies no washers: AXK 160200 arrives as the needle cage only, and a \"bearing failure\" on hard-faced tracks is usually a missing-AS-washer failure at ordering time.",
      "The 125/1000 kN ratings and 246 g mass are SKF catalogue values transcribed from ch. 12.1 of PUB BU/P1 17000 (PDF table page 910); mounting data — Ea/Eb raceway diameters and the minimum load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is an AXK thrust assembly mounted?",
        "a": "Harden or washer-face both tracks across Ea 166–Eb 197 mm, keep faces parallel, locate the cage concentrically against a shoulder or register, grease the needles so they stay pocketed, and never press through them."
      },
      {
        "q": "What are the dimensions and ratings of the AXK 160200?",
        "a": "A AXK 160200 measures 160 mm bore × 200 mm outside diameter × 5 mm width (6.299 × 7.874 × 0.197 in). From SKF catalogue PUB BU/P1 17000: dynamic C 125 kN, static C0 1000 kN, fatigue limit Pu 106 kN, reference speed 950 r/min, limiting speed 1,900 r/min, mass about 246 g. The contact band runs Ea 166–Eb 197 mm; hardened washers or 58–64 HRC faces are required."
      },
      {
        "q": "Does the AXK 160200 include washers?",
        "a": "No. AXK is the needle roller and cage thrust assembly only; hardened AS/LS washers or shaft/housing faces at 58–64 HRC, ground over the Ea 166–Eb 197 mm band, supply the two raceways."
      },
      {
        "q": "How is the AXK 160200 code read?",
        "a": "AXK marks the needle thrust assembly and 160/200 gives the inner 160 mm and outer 200 mm track diameters directly; the assembly is 5 mm thick. TN means the polymer cage instead of stamped steel."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXK160200",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.1 needle roller and cage thrust assemblies",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXK160200",
      "AXK 160200"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXW10",
    "brand": "SKF",
    "manufacturer_designation": "AXW 10",
    "series": "AXW-series",
    "type": "needle_roller_thrust",
    "d_mm": 10,
    "D_mm": 27,
    "B_mm": 3.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8.5,
    "static_load_kN": 26,
    "fatigue_load_limit_kN": 3,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 8.3,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "In the AXW needle roller thrust bearings with centring flange, AXW 10 denotes the spigot-centred execution: the flange seats in a matching housing register so the needle set stays concentric without piloting on the shaft, and the opposite raceway is a separate LS/AS washer or a hardened machine face. Reading the code: AXW marks the spigot-flanged needle roller thrust bearing and the figure 10 gives the bore in millimetres; the 27 mm OD and 3.2 mm height follow the series plan, and D1 14 mm is the spigot diameter. The integrated washer carries a 14 mm centring spigot (3 mm flange height) that locates the whole unit in a matching housing register bore — the 10 mm bore clears the shaft and does no radial piloting. One direction only: AXW 10 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: locate the 14 mm spigot in the housing register bore (at least 3 mm deep), pass the 10 mm bore over the shaft without forcing a pilot fit, and fit a separate LS/AS washer or a hardened 58–64 HRC face on the opposite side.",
    "applications": [
      "material-handling swivel joints using the spigot as a built-in housing pilot",
      "transmission shafts where a one-piece spigot-centred thrust unit replaces a loose cage-and-washer stack at the housing register",
      "automotive selector and shift mechanisms needing a pre-centred flanged thrust support in a shallow housing bore",
      "agricultural gear drives assembled through a housing cover, where the spigot keeps the needle set concentric until the cover is bolted"
    ],
    "failure_modes": [
      "spigot lip deformation after a hammer blow or cocked assembly at fitting",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted"
    ],
    "pitfalls": [
      "At 10 mm bore the 14 mm spigot lip is thin enough to bend with pliers — handle AXW 10 by the washer face, never by the flange.",
      "AXW is not an ISO-standardized interchangeable outline for every maker — check the 27×3.2 mm envelope and the 14 mm spigot before cross-brand substitution.",
      "The 8.5 kN rating still requires a hardened opposing face: the integrated washer is one raceway only, and the other track is a separate LS/AS washer or a 58–64 HRC machine face.",
      "The spigot pilots in the housing register, not on the shaft: turning the 10 mm bore into a tight pilot fit, or omitting the 14 mm register bore, defeats the centring function of AXW 10.",
      "the 5,300 r/min reference speed is the thermal criterion under load, limiting speed 10,000 r/min; the open needle set needs the housing to keep grit out.",
      "The 8.5/26 kN ratings and 8.3 g mass are SKF catalogue values transcribed from ch. 12.2 of PUB BU/P1 17000 (PDF table page 912); mounting data — Ea/Eb raceway diameters, the flange register and the load factor — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the AXW 10 take radial load?",
        "a": "No. The spigot is a locating pilot, not a radial bearing: the needle set carries one-direction thrust (8.5 kN dynamic) and the shaft arrangement carries all radial force."
      },
      {
        "q": "Does the AXW 10 run in both axial directions?",
        "a": "No — one direction only. Reversing thrust lifts the needles off the 23 mm outer track; mirror a second spigot-flanged unit for reversing shafts."
      },
      {
        "q": "What are the common mounting mistakes?",
        "a": "Pressing on the spigot lip, boring no register (or a wrong-size 14 mm register) in the housing, forcing the 10 mm bore into a pilot fit, leaving the opposite face soft, or skipping grease in the 3.2 mm section — each shows up as cage or track damage within hours."
      },
      {
        "q": "Which dimensions does the AXW 10 have?",
        "a": "A AXW 10 measures 10 mm bore × 27 mm outside diameter × 3.2 mm width (0.394 × 1.063 × 0.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 8.5 kN, static C0 26 kN, fatigue limit Pu 3 kN, reference speed 5,300 r/min, limiting speed 10,000 r/min, mass about 8.3 g. Centring spigot D1 14 mm, spigot height B1 3 mm, contact band Ea 12–23 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXW10",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXW10",
      "AXW 10"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXW12",
    "brand": "SKF",
    "manufacturer_designation": "AXW 12",
    "series": "AXW-series",
    "type": "needle_roller_thrust",
    "d_mm": 12,
    "D_mm": 29,
    "B_mm": 3.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9.15,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 3.45,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 9.1,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "AXW 12 is a needle roller thrust bearing with an integral centring spigot: an AXK-style needle cage running against a hardened thrust washer whose 16 mm spigot flange locates the unit in the housing register, sized 12×29×3.2 mm overall. AXW numbering gives the bore directly (12 mm for AXW 12); the needle set inside is the AXK 1226 track with 9.15 kN dynamic rating. The integrated washer carries a 16 mm centring spigot (3 mm flange height) that locates the whole unit in a matching housing register bore — the 12 mm bore clears the shaft and does no radial piloting. One direction only: AXW 12 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: locate the 16 mm spigot in the housing register bore (at least 3 mm deep), pass the 12 mm bore over the shaft without forcing a pilot fit, and fit a separate LS/AS washer or a hardened 58–64 HRC face on the opposite side.",
    "applications": [
      "material-handling swivel joints using the spigot as a built-in housing pilot",
      "transmission shafts where a one-piece spigot-centred thrust unit replaces a loose cage-and-washer stack at the housing register",
      "automotive selector and shift mechanisms needing a pre-centred flanged thrust support in a shallow housing bore",
      "agricultural gear drives assembled through a housing cover, where the spigot keeps the needle set concentric until the cover is bolted"
    ],
    "failure_modes": [
      "opposing-track scoring when the separate LS/AS washer or hardened 58–64 HRC face is missing or undersized",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted"
    ],
    "pitfalls": [
      "At 12 mm bore the 16 mm spigot lip is thin enough to bend with pliers — handle AXW 12 by the washer face, never by the flange.",
      "the 5,000 r/min reference speed is the thermal criterion under load, limiting speed 10,000 r/min; the open needle set needs the housing to keep grit out.",
      "One-direction thrust: reversing force dumps the needles off the 25 mm outer track — mirror a second spigot-flanged unit where the load reverses.",
      "The spigot pilots in the housing register, not on the shaft: turning the 12 mm bore into a tight pilot fit, or omitting the 16 mm register bore, defeats the centring function of AXW 12.",
      "AXW is not an ISO-standardized interchangeable outline for every maker — check the 29×3.2 mm envelope and the 16 mm spigot before cross-brand substitution.",
      "The 9.15/30 kN ratings and 9.1 g mass are SKF catalogue values transcribed from ch. 12.2 of PUB BU/P1 17000 (PDF table page 912); mounting data — Ea/Eb raceway diameters, the flange register and the load factor — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the AXW 12 have?",
        "a": "A AXW 12 measures 12 mm bore × 29 mm outside diameter × 3.2 mm width (0.472 × 1.142 × 0.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9.15 kN, static C0 30 kN, fatigue limit Pu 3.45 kN, reference speed 5,000 r/min, limiting speed 10,000 r/min, mass about 9.1 g. Centring spigot D1 16 mm, spigot height B1 3 mm, contact band Ea 14–25 mm."
      },
      {
        "q": "What does AXW mean versus AXK?",
        "a": "AXW pairs an AXK needle set with a washer that has an integral centring spigot — the spigot locates in a housing register and keeps the set concentric as one part; AXK is the bare cage needing two separate washers. A separate LS/AS washer or hardened face is still required opposite, and the outline is not multi-brand interchangeable."
      },
      {
        "q": "Can the AXW 12 take radial load?",
        "a": "No. The spigot is a locating pilot, not a radial bearing: the needle set carries one-direction thrust (9.15 kN dynamic) and the shaft arrangement carries all radial force."
      },
      {
        "q": "Does the AXW 12 run in both axial directions?",
        "a": "No — one direction only. Reversing thrust lifts the needles off the 25 mm outer track; mirror a second spigot-flanged unit for reversing shafts."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXW12",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXW12",
      "AXW 12"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXW15",
    "brand": "SKF",
    "manufacturer_designation": "AXW 15",
    "series": "AXW-series",
    "type": "needle_roller_thrust",
    "d_mm": 15,
    "D_mm": 31,
    "B_mm": 3.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10.4,
    "static_load_kN": 37.5,
    "fatigue_load_limit_kN": 4.3,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 9500,
    "max_rpm": 9500,
    "weight_g": 10,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "In the AXW needle roller thrust bearings with centring flange, AXW 15 denotes the spigot-centred execution: the flange seats in a matching housing register so the needle set stays concentric without piloting on the shaft, and the opposite raceway is a separate LS/AS washer or a hardened machine face. In AXW 15 the 15 selects the shaft clearance, while the built-in 21 mm spigot (B1 3.5 mm high) locates in a housing register; the opposing raceway stays a separately ordered LS/AS washer. The integrated washer carries a 21 mm centring spigot (3.5 mm flange height) that locates the whole unit in a matching housing register bore — the 15 mm bore clears the shaft and does no radial piloting. One direction only: AXW 15 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: locate the 21 mm spigot in the housing register bore (at least 3.5 mm deep), pass the 15 mm bore over the shaft without forcing a pilot fit, and fit a separate LS/AS washer or a hardened 58–64 HRC face on the opposite side.",
    "applications": [
      "material-handling swivel joints using the spigot as a built-in housing pilot",
      "transmission shafts where a one-piece spigot-centred thrust unit replaces a loose cage-and-washer stack at the housing register",
      "automotive selector and shift mechanisms needing a pre-centred flanged thrust support in a shallow housing bore",
      "agricultural gear drives assembled through a housing cover, where the spigot keeps the needle set concentric until the cover is bolted"
    ],
    "failure_modes": [
      "opposing-track scoring when the separate LS/AS washer or hardened 58–64 HRC face is missing or undersized",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish",
      "hard-particle indentation where oil or grease filtration is inadequate"
    ],
    "pitfalls": [
      "At 15 mm bore the 21 mm spigot lip is thin enough to bend with pliers — handle AXW 15 by the washer face, never by the flange.",
      "AXW is not an ISO-standardized interchangeable outline for every maker — check the 31×3.2 mm envelope and the 21 mm spigot before cross-brand substitution.",
      "The 10.4 kN rating still requires a hardened opposing face: the integrated washer is one raceway only, and the other track is a separate LS/AS washer or a 58–64 HRC machine face.",
      "The spigot pilots in the housing register, not on the shaft: turning the 15 mm bore into a tight pilot fit, or omitting the 21 mm register bore, defeats the centring function of AXW 15.",
      "the 4,800 r/min reference speed is the thermal criterion under load, limiting speed 9,500 r/min; the open needle set needs the housing to keep grit out.",
      "The 10.4/37.5 kN ratings and 10 g mass are SKF catalogue values transcribed from ch. 12.2 of PUB BU/P1 17000 (PDF table page 912); mounting data — Ea/Eb raceway diameters, the flange register and the load factor — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the AXW 15 designation read?",
        "a": "AXW marks the spigot-flanged needle roller thrust bearing and 15 is the bore in millimetres; the series plan fixes the 31 mm OD and 3.2 mm overall height, D1 21 mm is the spigot, and the AXK 1528 needle set runs inside."
      },
      {
        "q": "Does the AXW 15 still need hardened faces?",
        "a": "The integrated spigot washer is one hardened raceway, but the opposing face is the application's responsibility — fit a separate LS/AS washer or harden it to 58–64 HRC over Ea 17–Eb 27 mm."
      },
      {
        "q": "How is an AXW bearing mounted?",
        "a": "Locate the 21 mm spigot in the housing register bore, pass the 15 mm bore over the shaft without a pilot fit, fit a separate LS/AS washer or a 58–64 HRC face on the opposite side, and press via the washer back only."
      },
      {
        "q": "What are the dimensions and ratings of the AXW 15?",
        "a": "A AXW 15 measures 15 mm bore × 31 mm outside diameter × 3.2 mm width (0.591 × 1.22 × 0.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10.4 kN, static C0 37.5 kN, fatigue limit Pu 4.3 kN, reference speed 4,800 r/min, limiting speed 9,500 r/min, mass about 10 g. Centring spigot D1 21 mm, spigot height B1 3.5 mm, contact band Ea 17–27 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXW15",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXW15",
      "AXW 15"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXW20",
    "brand": "SKF",
    "manufacturer_designation": "AXW 20",
    "series": "AXW-series",
    "type": "needle_roller_thrust",
    "d_mm": 20,
    "D_mm": 38,
    "B_mm": 3.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12,
    "static_load_kN": 47.5,
    "fatigue_load_limit_kN": 5.6,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 14,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "SKF lists AXW 20 in SKF catalogue PUB BU/P1 17000 ch. 12.2: the 3.5 mm high, 26 mm diameter spigot centres the bearing radially in the housing while the needle set takes one-direction thrust of 12 kN. In AXW 20 the 20 selects the shaft clearance, while the built-in 26 mm spigot (B1 3.5 mm high) locates in a housing register; the opposing raceway stays a separately ordered LS/AS washer. The integrated washer carries a 26 mm centring spigot (3.5 mm flange height) that locates the whole unit in a matching housing register bore — the 20 mm bore clears the shaft and does no radial piloting. One direction only: AXW 20 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Because the spigot sets concentricity, the shaft fit relaxes versus a piloted washer; still harden or washer-face the opposite track to 58–64 HRC across the 22–34 mm contact band.",
    "applications": [
      "material-handling swivel joints using the spigot as a built-in housing pilot",
      "transmission shafts where a one-piece spigot-centred thrust unit replaces a loose cage-and-washer stack at the housing register",
      "automotive selector and shift mechanisms needing a pre-centred flanged thrust support in a shallow housing bore",
      "agricultural gear drives assembled through a housing cover, where the spigot keeps the needle set concentric until the cover is bolted"
    ],
    "failure_modes": [
      "opposing-track scoring when the separate LS/AS washer or hardened 58–64 HRC face is missing or undersized",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "condensation pitting in machines that run intermittently in humid environments"
    ],
    "pitfalls": [
      "On a 20 mm shaft the register fit decides concentricity: a loose or oversize 26 mm register bore lets the 3.2 mm needle set orbit, wearing a groove in both tracks.",
      "The 12 kN rating still requires a hardened opposing face: the integrated washer is one raceway only, and the other track is a separate LS/AS washer or a 58–64 HRC machine face.",
      "the 4,300 r/min reference speed is the thermal criterion under load, limiting speed 8,500 r/min; the open needle set needs the housing to keep grit out.",
      "The spigot pilots in the housing register, not on the shaft: turning the 20 mm bore into a tight pilot fit, or omitting the 26 mm register bore, defeats the centring function of AXW 20.",
      "AXW is not an ISO-standardized interchangeable outline for every maker — check the 38×3.2 mm envelope and the 26 mm spigot before cross-brand substitution.",
      "The 12/47.5 kN ratings and 14 g mass are SKF catalogue values transcribed from ch. 12.2 of PUB BU/P1 17000 (PDF table page 912); mounting data — Ea/Eb raceway diameters, the flange register and the load factor — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is an AXW bearing mounted?",
        "a": "Locate the 26 mm spigot in the housing register bore, pass the 20 mm bore over the shaft without a pilot fit, fit a separate LS/AS washer or a 58–64 HRC face on the opposite side, and press via the washer back only."
      },
      {
        "q": "What are the dimensions and ratings of the AXW 20?",
        "a": "A AXW 20 measures 20 mm bore × 38 mm outside diameter × 3.2 mm width (0.787 × 1.496 × 0.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 12 kN, static C0 47.5 kN, fatigue limit Pu 5.6 kN, reference speed 4,300 r/min, limiting speed 8,500 r/min, mass about 14 g. Centring spigot D1 26 mm, spigot height B1 3.5 mm, contact band Ea 22–34 mm."
      },
      {
        "q": "What is the centring spigot on the AXW 20 for?",
        "a": "The 26 mm diameter, 3.5 mm high spigot locates the bearing in a matching housing register and centres the needle set radially; it does not pilot on the 20 mm shaft."
      },
      {
        "q": "How is the AXW 20 designation read?",
        "a": "AXW marks the spigot-flanged needle roller thrust bearing and 20 is the bore in millimetres; the series plan fixes the 38 mm OD and 3.2 mm overall height, D1 26 mm is the spigot, and the AXK 2035 needle set runs inside."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXW20",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXW20",
      "AXW 20"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXW25",
    "brand": "SKF",
    "manufacturer_designation": "AXW 25",
    "series": "AXW-series",
    "type": "needle_roller_thrust",
    "d_mm": 25,
    "D_mm": 45,
    "B_mm": 3.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13.4,
    "static_load_kN": 60,
    "fatigue_load_limit_kN": 6.95,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 20,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "SKF lists AXW 25 in SKF catalogue PUB BU/P1 17000 ch. 12.2: the 4 mm high, 32 mm diameter spigot centres the bearing radially in the housing while the needle set takes one-direction thrust of 13.4 kN. AXW numbering gives the bore directly (25 mm for AXW 25); the needle set inside is the AXK 2542 track with 13.4 kN dynamic rating. The integrated washer carries a 32 mm centring spigot (4 mm flange height) that locates the whole unit in a matching housing register bore — the 25 mm bore clears the shaft and does no radial piloting. One direction only: AXW 25 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Because the spigot sets concentricity, the shaft fit relaxes versus a piloted washer; still harden or washer-face the opposite track to 58–64 HRC across the 29–41 mm contact band.",
    "applications": [
      "material-handling swivel joints using the spigot as a built-in housing pilot",
      "transmission shafts where a one-piece spigot-centred thrust unit replaces a loose cage-and-washer stack at the housing register",
      "automotive selector and shift mechanisms needing a pre-centred flanged thrust support in a shallow housing bore",
      "agricultural gear drives assembled through a housing cover, where the spigot keeps the needle set concentric until the cover is bolted"
    ],
    "failure_modes": [
      "centring-spigot fretting in a loose register bore until the needle set runs eccentric",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "false brinelling and rust-red witness marks on standby machines under external vibration"
    ],
    "pitfalls": [
      "On a 25 mm shaft the register fit decides concentricity: a loose or oversize 32 mm register bore lets the 3.2 mm needle set orbit, wearing a groove in both tracks.",
      "The 13.4 kN rating still requires a hardened opposing face: the integrated washer is one raceway only, and the other track is a separate LS/AS washer or a 58–64 HRC machine face.",
      "the 3,800 r/min reference speed is the thermal criterion under load, limiting speed 7,500 r/min; the open needle set needs the housing to keep grit out.",
      "The spigot pilots in the housing register, not on the shaft: turning the 25 mm bore into a tight pilot fit, or omitting the 32 mm register bore, defeats the centring function of AXW 25.",
      "AXW is not an ISO-standardized interchangeable outline for every maker — check the 45×3.2 mm envelope and the 32 mm spigot before cross-brand substitution.",
      "The 13.4/60 kN ratings and 20 g mass are SKF catalogue values transcribed from ch. 12.2 of PUB BU/P1 17000 (PDF table page 912); mounting data — Ea/Eb raceway diameters, the flange register and the load factor — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the common mounting mistakes?",
        "a": "Pressing on the spigot lip, boring no register (or a wrong-size 32 mm register) in the housing, forcing the 25 mm bore into a pilot fit, leaving the opposite face soft, or skipping grease in the 3.2 mm section — each shows up as cage or track damage within hours."
      },
      {
        "q": "Which dimensions does the AXW 25 have?",
        "a": "A AXW 25 measures 25 mm bore × 45 mm outside diameter × 3.2 mm width (0.984 × 1.772 × 0.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13.4 kN, static C0 60 kN, fatigue limit Pu 6.95 kN, reference speed 3,800 r/min, limiting speed 7,500 r/min, mass about 20 g. Centring spigot D1 32 mm, spigot height B1 4 mm, contact band Ea 29–41 mm."
      },
      {
        "q": "What does AXW mean versus AXK?",
        "a": "AXW pairs an AXK needle set with a washer that has an integral centring spigot — the spigot locates in a housing register and keeps the set concentric as one part; AXK is the bare cage needing two separate washers. A separate LS/AS washer or hardened face is still required opposite, and the outline is not multi-brand interchangeable."
      },
      {
        "q": "Can the AXW 25 take radial load?",
        "a": "No. The spigot is a locating pilot, not a radial bearing: the needle set carries one-direction thrust (13.4 kN dynamic) and the shaft arrangement carries all radial force."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXW25",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXW25",
      "AXW 25"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXW30",
    "brand": "SKF",
    "manufacturer_designation": "AXW 30",
    "series": "AXW-series",
    "type": "needle_roller_thrust",
    "d_mm": 30,
    "D_mm": 50,
    "B_mm": 3.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15,
    "static_load_kN": 72,
    "fatigue_load_limit_kN": 8.3,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 22,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "AXW 30 is the assembly-friendly pairing of an AXK 3047 cage with a spigot washer: cage and washer arrive pre-centred as one part at 30×50 mm, 3.2 mm total height. AXW numbering gives the bore directly (30 mm for AXW 30); the needle set inside is the AXK 3047 track with 15 kN dynamic rating. The integrated washer carries a 37 mm centring spigot (4 mm flange height) that locates the whole unit in a matching housing register bore — the 30 mm bore clears the shaft and does no radial piloting. One direction only: AXW 30 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Press only on the washer back — never on the spigot lip or through the needle cage — keep the register free of burrs, and verify the unit turns without the flange rubbing its register.",
    "applications": [
      "material-handling swivel joints using the spigot as a built-in housing pilot",
      "transmission shafts where a one-piece spigot-centred thrust unit replaces a loose cage-and-washer stack at the housing register",
      "automotive selector and shift mechanisms needing a pre-centred flanged thrust support in a shallow housing bore",
      "agricultural gear drives assembled through a housing cover, where the spigot keeps the needle set concentric until the cover is bolted"
    ],
    "failure_modes": [
      "centring-spigot fretting in a loose register bore until the needle set runs eccentric",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation"
    ],
    "pitfalls": [
      "On a 30 mm shaft the register fit decides concentricity: a loose or oversize 37 mm register bore lets the 3.2 mm needle set orbit, wearing a groove in both tracks.",
      "the 3,600 r/min reference speed is the thermal criterion under load, limiting speed 7,000 r/min; the open needle set needs the housing to keep grit out.",
      "One-direction thrust: reversing force dumps the needles off the 46 mm outer track — mirror a second spigot-flanged unit where the load reverses.",
      "The spigot pilots in the housing register, not on the shaft: turning the 30 mm bore into a tight pilot fit, or omitting the 37 mm register bore, defeats the centring function of AXW 30.",
      "AXW is not an ISO-standardized interchangeable outline for every maker — check the 50×3.2 mm envelope and the 37 mm spigot before cross-brand substitution.",
      "The 15/72 kN ratings and 22 g mass are SKF catalogue values transcribed from ch. 12.2 of PUB BU/P1 17000 (PDF table page 912); mounting data — Ea/Eb raceway diameters, the flange register and the load factor — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What does AXW mean versus AXK?",
        "a": "AXW pairs an AXK needle set with a washer that has an integral centring spigot — the spigot locates in a housing register and keeps the set concentric as one part; AXK is the bare cage needing two separate washers. A separate LS/AS washer or hardened face is still required opposite, and the outline is not multi-brand interchangeable."
      },
      {
        "q": "Can the AXW 30 take radial load?",
        "a": "No. The spigot is a locating pilot, not a radial bearing: the needle set carries one-direction thrust (15 kN dynamic) and the shaft arrangement carries all radial force."
      },
      {
        "q": "Does the AXW 30 run in both axial directions?",
        "a": "No — one direction only. Reversing thrust lifts the needles off the 46 mm outer track; mirror a second spigot-flanged unit for reversing shafts."
      },
      {
        "q": "What are the common mounting mistakes?",
        "a": "Pressing on the spigot lip, boring no register (or a wrong-size 37 mm register) in the housing, forcing the 30 mm bore into a pilot fit, leaving the opposite face soft, or skipping grease in the 3.2 mm section — each shows up as cage or track damage within hours."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXW30",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXW30",
      "AXW 30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXW35",
    "brand": "SKF",
    "manufacturer_designation": "AXW 35",
    "series": "AXW-series",
    "type": "needle_roller_thrust",
    "d_mm": 35,
    "D_mm": 55,
    "B_mm": 3.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16.6,
    "static_load_kN": 83,
    "fatigue_load_limit_kN": 9.8,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 27,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "AXW 35 is the assembly-friendly pairing of an AXK 3552 cage with a spigot washer: cage and washer arrive pre-centred as one part at 35×55 mm, 3.2 mm total height. The designation AXW 35 reads as flanged (AXW) needle thrust for a 35 mm shaft — the spigot pilots in the 42 mm housing register, not on the shaft. The integrated washer carries a 42 mm centring spigot (4 mm flange height) that locates the whole unit in a matching housing register bore — the 35 mm bore clears the shaft and does no radial piloting. One direction only: AXW 35 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Press only on the washer back — never on the spigot lip or through the needle cage — keep the register free of burrs, and verify the unit turns without the flange rubbing its register.",
    "applications": [
      "material-handling swivel joints using the spigot as a built-in housing pilot",
      "transmission shafts where a one-piece spigot-centred thrust unit replaces a loose cage-and-washer stack at the housing register",
      "automotive selector and shift mechanisms needing a pre-centred flanged thrust support in a shallow housing bore",
      "agricultural gear drives assembled through a housing cover, where the spigot keeps the needle set concentric until the cover is bolted"
    ],
    "failure_modes": [
      "spigot lip deformation after a hammer blow or cocked assembly at fitting",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "needle-row denting from a single hard particle trapped in the 2 mm section",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements"
    ],
    "pitfalls": [
      "At 35 mm, verify the opposite raceway face — the integrated spigot washer supplies one side only; a soft face or missing LS/AS washer on the other ribs within months.",
      "the 3,200 r/min reference speed is the thermal criterion under load, limiting speed 6,300 r/min; the open needle set needs the housing to keep grit out.",
      "One-direction thrust: reversing force dumps the needles off the 51 mm outer track — mirror a second spigot-flanged unit where the load reverses.",
      "The spigot pilots in the housing register, not on the shaft: turning the 35 mm bore into a tight pilot fit, or omitting the 42 mm register bore, defeats the centring function of AXW 35.",
      "AXW is not an ISO-standardized interchangeable outline for every maker — check the 55×3.2 mm envelope and the 42 mm spigot before cross-brand substitution.",
      "The 16.6/83 kN ratings and 27 g mass are SKF catalogue values transcribed from ch. 12.2 of PUB BU/P1 17000 (PDF table page 912); mounting data — Ea/Eb raceway diameters, the flange register and the load factor — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the centring spigot on the AXW 35 for?",
        "a": "The 42 mm diameter, 4 mm high spigot locates the bearing in a matching housing register and centres the needle set radially; it does not pilot on the 35 mm shaft."
      },
      {
        "q": "How is the AXW 35 designation read?",
        "a": "AXW marks the spigot-flanged needle roller thrust bearing and 35 is the bore in millimetres; the series plan fixes the 55 mm OD and 3.2 mm overall height, D1 42 mm is the spigot, and the AXK 3552 needle set runs inside."
      },
      {
        "q": "Does the AXW 35 still need hardened faces?",
        "a": "The integrated spigot washer is one hardened raceway, but the opposing face is the application's responsibility — fit a separate LS/AS washer or harden it to 58–64 HRC over Ea 39–Eb 51 mm."
      },
      {
        "q": "How is an AXW bearing mounted?",
        "a": "Locate the 42 mm spigot in the housing register bore, pass the 35 mm bore over the shaft without a pilot fit, fit a separate LS/AS washer or a 58–64 HRC face on the opposite side, and press via the washer back only."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXW35",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXW35",
      "AXW 35"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXW40",
    "brand": "SKF",
    "manufacturer_designation": "AXW 40",
    "series": "AXW-series",
    "type": "needle_roller_thrust",
    "d_mm": 40,
    "D_mm": 63,
    "B_mm": 4.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 25,
    "static_load_kN": 114,
    "fatigue_load_limit_kN": 13.7,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 39,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "The flanged thrust bearing AXW 40 combines a 40 mm bore, a 63 mm outer track and a 47 mm centring spigot in one 4.2 mm high unit; the needle contact runs 45–58 mm and the rating is 25 kN dynamic. The designation AXW 40 reads as flanged (AXW) needle thrust for a 40 mm shaft — the spigot pilots in the 47 mm housing register, not on the shaft. The integrated washer carries a 47 mm centring spigot (4 mm flange height) that locates the whole unit in a matching housing register bore — the 40 mm bore clears the shaft and does no radial piloting. One direction only: AXW 40 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: locate the 47 mm spigot in the housing register bore (at least 4 mm deep), pass the 40 mm bore over the shaft without forcing a pilot fit, and fit a separate LS/AS washer or a hardened 58–64 HRC face on the opposite side.",
    "applications": [
      "material-handling swivel joints using the spigot as a built-in housing pilot",
      "transmission shafts where a one-piece spigot-centred thrust unit replaces a loose cage-and-washer stack at the housing register",
      "automotive selector and shift mechanisms needing a pre-centred flanged thrust support in a shallow housing bore",
      "agricultural gear drives assembled through a housing cover, where the spigot keeps the needle set concentric until the cover is bolted"
    ],
    "failure_modes": [
      "spigot lip deformation after a hammer blow or cocked assembly at fitting",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "edge loading across the needle crowns when the mating faces are not square to the shaft",
      "hard-particle indentation where oil or grease filtration is inadequate"
    ],
    "pitfalls": [
      "At 40 mm, verify the opposite raceway face — the integrated spigot washer supplies one side only; a soft face or missing LS/AS washer on the other ribs within months.",
      "One-direction thrust: reversing force dumps the needles off the 58 mm outer track — mirror a second spigot-flanged unit where the load reverses.",
      "The spigot pilots in the housing register, not on the shaft: turning the 40 mm bore into a tight pilot fit, or omitting the 47 mm register bore, defeats the centring function of AXW 40.",
      "AXW is not an ISO-standardized interchangeable outline for every maker — check the 63×4.2 mm envelope and the 47 mm spigot before cross-brand substitution.",
      "The 25 kN rating still requires a hardened opposing face: the integrated washer is one raceway only, and the other track is a separate LS/AS washer or a 58–64 HRC machine face.",
      "The 25/114 kN ratings and 39 g mass are SKF catalogue values transcribed from ch. 12.2 of PUB BU/P1 17000 (PDF table page 912); mounting data — Ea/Eb raceway diameters, the flange register and the load factor — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Does the AXW 40 still need hardened faces?",
        "a": "The integrated spigot washer is one hardened raceway, but the opposing face is the application's responsibility — fit a separate LS/AS washer or harden it to 58–64 HRC over Ea 45–Eb 58 mm."
      },
      {
        "q": "How is an AXW bearing mounted?",
        "a": "Locate the 47 mm spigot in the housing register bore, pass the 40 mm bore over the shaft without a pilot fit, fit a separate LS/AS washer or a 58–64 HRC face on the opposite side, and press via the washer back only."
      },
      {
        "q": "What are the dimensions and ratings of the AXW 40?",
        "a": "A AXW 40 measures 40 mm bore × 63 mm outside diameter × 4.2 mm width (1.575 × 2.48 × 0.165 in). From SKF catalogue PUB BU/P1 17000: dynamic C 25 kN, static C0 114 kN, fatigue limit Pu 13.7 kN, reference speed 2,800 r/min, limiting speed 5,600 r/min, mass about 39 g. Centring spigot D1 47 mm, spigot height B1 4 mm, contact band Ea 45–58 mm."
      },
      {
        "q": "What is the centring spigot on the AXW 40 for?",
        "a": "The 47 mm diameter, 4 mm high spigot locates the bearing in a matching housing register and centres the needle set radially; it does not pilot on the 40 mm shaft."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXW40",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXW40",
      "AXW 40"
    ],
    "locale_variants": {}
  },
  {
    "sku": "AXW45",
    "brand": "SKF",
    "manufacturer_designation": "AXW 45",
    "series": "AXW-series",
    "type": "needle_roller_thrust",
    "d_mm": 45,
    "D_mm": 68,
    "B_mm": 4.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 27,
    "static_load_kN": 127,
    "fatigue_load_limit_kN": 15.3,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 43,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 3031",
    "naming_rule_text": "The flanged thrust bearing AXW 45 combines a 45 mm bore, a 68 mm outer track and a 52 mm centring spigot in one 4.2 mm high unit; the needle contact runs 50–63 mm and the rating is 27 kN dynamic. Reading the code: AXW marks the spigot-flanged needle roller thrust bearing and the figure 45 gives the bore in millimetres; the 68 mm OD and 4.2 mm height follow the series plan, and D1 52 mm is the spigot diameter. The integrated washer carries a 52 mm centring spigot (4 mm flange height) that locates the whole unit in a matching housing register bore — the 45 mm bore clears the shaft and does no radial piloting. One direction only: AXW 45 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: locate the 52 mm spigot in the housing register bore (at least 4 mm deep), pass the 45 mm bore over the shaft without forcing a pilot fit, and fit a separate LS/AS washer or a hardened 58–64 HRC face on the opposite side.",
    "applications": [
      "material-handling swivel joints using the spigot as a built-in housing pilot",
      "transmission shafts where a one-piece spigot-centred thrust unit replaces a loose cage-and-washer stack at the housing register",
      "automotive selector and shift mechanisms needing a pre-centred flanged thrust support in a shallow housing bore",
      "agricultural gear drives assembled through a housing cover, where the spigot keeps the needle set concentric until the cover is bolted"
    ],
    "failure_modes": [
      "opposing-track scoring when the separate LS/AS washer or hardened 58–64 HRC face is missing or undersized",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "instant raceway scoring when the assembly runs against a face below 58 HRC or with a rough finish",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted"
    ],
    "pitfalls": [
      "At 45 mm, verify the opposite raceway face — the integrated spigot washer supplies one side only; a soft face or missing LS/AS washer on the other ribs within months.",
      "One-direction thrust: reversing force dumps the needles off the 63 mm outer track — mirror a second spigot-flanged unit where the load reverses.",
      "The spigot pilots in the housing register, not on the shaft: turning the 45 mm bore into a tight pilot fit, or omitting the 52 mm register bore, defeats the centring function of AXW 45.",
      "AXW is not an ISO-standardized interchangeable outline for every maker — check the 68×4.2 mm envelope and the 52 mm spigot before cross-brand substitution.",
      "The 27 kN rating still requires a hardened opposing face: the integrated washer is one raceway only, and the other track is a separate LS/AS washer or a 58–64 HRC machine face.",
      "The 27/127 kN ratings and 43 g mass are SKF catalogue values transcribed from ch. 12.2 of PUB BU/P1 17000 (PDF table page 912); mounting data — Ea/Eb raceway diameters, the flange register and the load factor — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Does the AXW 45 run in both axial directions?",
        "a": "No — one direction only. Reversing thrust lifts the needles off the 63 mm outer track; mirror a second spigot-flanged unit for reversing shafts."
      },
      {
        "q": "What are the common mounting mistakes?",
        "a": "Pressing on the spigot lip, boring no register (or a wrong-size 52 mm register) in the housing, forcing the 45 mm bore into a pilot fit, leaving the opposite face soft, or skipping grease in the 4.2 mm section — each shows up as cage or track damage within hours."
      },
      {
        "q": "Which dimensions does the AXW 45 have?",
        "a": "A AXW 45 measures 45 mm bore × 68 mm outside diameter × 4.2 mm width (1.772 × 2.677 × 0.165 in). From SKF catalogue PUB BU/P1 17000: dynamic C 27 kN, static C0 127 kN, fatigue limit Pu 15.3 kN, reference speed 2,600 r/min, limiting speed 5,300 r/min, mass about 43 g. Centring spigot D1 52 mm, spigot height B1 4 mm, contact band Ea 50–63 mm."
      },
      {
        "q": "What does AXW mean versus AXK?",
        "a": "AXW pairs an AXK needle set with a washer that has an integral centring spigot — the spigot locates in a housing register and keeps the set concentric as one part; AXK is the bare cage needing two separate washers. A separate LS/AS washer or hardened face is still required opposite, and the outline is not multi-brand interchangeable."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "AXW45",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 12.2 needle roller thrust bearings with a centring flange",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "AXW45",
      "AXW 45"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29412-E",
    "brand": "SKF",
    "manufacturer_designation": "29412 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 390,
    "static_load_kN": 915,
    "fatigue_load_limit_kN": 114,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 2600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29412 E is the classic hook-block and screw-end thrust bearing: 60 mm shaft washer bore, 130 mm OD, minimum axial load factor A 0.08, and free rotation under load thanks to the spherical geometry. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29412 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. The 2600 g mass and 42 mm axial height sit between 60 and 130 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 0.08) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 60 mm bore the 294 bearing already weighs 2.6 kg and sits 42 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29412 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 0.08 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 390/915 kN ratings and 2600 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29412 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29412 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.08 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 5,000 r/min."
      },
      {
        "q": "Which dimensions does the 29412 E have?",
        "a": "A 29412 E measures 60 mm bore × 130 mm outside diameter × 42 mm width (2.362 × 5.118 × 1.654 in). From SKF catalogue PUB BU/P1 17000: dynamic C 390 kN, static C0 915 kN, fatigue limit Pu 114 kN, reference speed 2,800 r/min, limiting speed 5,000 r/min, mass about 2600 g. Minimum axial load factor A 0.08 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29412",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29412",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29412-E",
      "29412 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29413-E",
    "brand": "SKF",
    "manufacturer_designation": "29413 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 455,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 137,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 3200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29413 E for very heavy one-direction axial load: 455 kN dynamic and 1080 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. The designation 29413 E separates into 294 (series), 13 (65 mm bore) and E; washers are separable for individual mounting. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Minimum axial load is explicit at factor A 0.11: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 0.11) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 65 mm bore the 294 bearing already weighs 3.2 kg and sits 45 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "the 2,600 r/min reference speed is the thermal criterion under load, the 4,800 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29413 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 0.11 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 455/1080 kN ratings and 3200 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 0.11) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.11 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29413 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29413 E mounted?",
        "a": "Tight shaft washer on the 65 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.11 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29413 E?",
        "a": "A 29413 E measures 65 mm bore × 140 mm outside diameter × 45 mm width (2.559 × 5.512 × 1.772 in). From SKF catalogue PUB BU/P1 17000: dynamic C 455 kN, static C0 1080 kN, fatigue limit Pu 137 kN, reference speed 2,600 r/min, limiting speed 4,800 r/min, mass about 3200 g. Minimum axial load factor A 0.11 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29413",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29413",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29413-E",
      "29413 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29414-E",
    "brand": "SKF",
    "manufacturer_designation": "29414 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 520,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 153,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 3900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29414 E is the classic hook-block and screw-end thrust bearing: 70 mm shaft washer bore, 150 mm OD, minimum axial load factor A 0.15, and free rotation under load thanks to the spherical geometry. In 29414 E, the 294 series fixes the 150 mm OD and 48 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 14 selects the 70 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Selection arithmetic: C 520 kN against C0 1250 kN gives a C0/C ratio of 2.40 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Verify the minimum axial load (factor A 0.15) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 70 mm bore the 294 bearing already weighs 3.9 kg and sits 48 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "Minimum load factor A 0.15 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29414 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 520/1250 kN ratings and 3900 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 0.15) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.15 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29414 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29414 E mounted?",
        "a": "Tight shaft washer on the 70 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.15 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29414 E?",
        "a": "A 29414 E measures 70 mm bore × 150 mm outside diameter × 48 mm width (2.756 × 5.906 × 1.89 in). From SKF catalogue PUB BU/P1 17000: dynamic C 520 kN, static C0 1250 kN, fatigue limit Pu 153 kN, reference speed 2,400 r/min, limiting speed 4,300 r/min, mass about 3900 g. Minimum axial load factor A 0.15 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29414",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29414",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29414-E",
      "29414 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29415-E",
    "brand": "SKF",
    "manufacturer_designation": "29415 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 600,
    "static_load_kN": 1430,
    "fatigue_load_limit_kN": 173,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 4700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29415 E is a spherical roller thrust bearing to ISO 104 in the heavy 294 series: asymmetrical barrel rollers running on a sphered housing washer, sized 75×160×51 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29415 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. One direction only: 29415 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 75 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 600 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 75 mm bore the 294 bearing already weighs 4.7 kg and sits 51 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "The 600/1430 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.19 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29415 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 600/1430 kN ratings and 4700 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29415 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29415 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.19 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 4,000 r/min."
      },
      {
        "q": "Which dimensions does the 29415 E have?",
        "a": "A 29415 E measures 75 mm bore × 160 mm outside diameter × 51 mm width (2.953 × 6.299 × 2.008 in). From SKF catalogue PUB BU/P1 17000: dynamic C 600 kN, static C0 1430 kN, fatigue limit Pu 173 kN, reference speed 2,400 r/min, limiting speed 4,000 r/min, mass about 4700 g. Minimum axial load factor A 0.19 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29415",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29415",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29415-E",
      "29415 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29416-E",
    "brand": "SKF",
    "manufacturer_designation": "29416 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 54,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 670,
    "static_load_kN": 1630,
    "fatigue_load_limit_kN": 193,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 5600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29416 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 54 mm of axial section. The designation 29416 E separates into 294 (series), 16 (80 mm bore) and E; washers are separable for individual mounting. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. One direction only: 29416 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 80 mm bore the 294 bearing already weighs 5.6 kg and sits 54 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 670/1630 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.25 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 670/1630 kN ratings and 5600 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29416 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29416 E mounted?",
        "a": "Tight shaft washer on the 80 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.25 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29416 E?",
        "a": "A 29416 E measures 80 mm bore × 170 mm outside diameter × 54 mm width (3.15 × 6.693 × 2.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 670 kN, static C0 1630 kN, fatigue limit Pu 193 kN, reference speed 2,200 r/min, limiting speed 3,800 r/min, mass about 5600 g. Minimum axial load factor A 0.25 must be maintained in service."
      },
      {
        "q": "How is the 29416 E designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 16 the 80 mm bore (code 16 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29416",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×54 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29416",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29416-E",
      "29416 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29317-E",
    "brand": "SKF",
    "manufacturer_designation": "29317 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 129,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 2750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The medium 293 series bearing 29317 E carries 380 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 85 mm shafts. In 29317 E, the 293 series fixes the 150 mm OD and 39 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 17 selects the 85 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Selection arithmetic: C 380 kN against C0 1060 kN gives a C0/C ratio of 2.79 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: fit the shaft washer tight on the 85 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 380 kN working load.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 85 mm bore the 293 bearing already weighs 2.8 kg and sits 39 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 380/1060 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.11 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 380/1060 kN ratings and 2750 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 0.11) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.11 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29317 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29317 E mounted?",
        "a": "Tight shaft washer on the 85 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.11 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29317 E?",
        "a": "A 29317 E measures 85 mm bore × 150 mm outside diameter × 39 mm width (3.346 × 5.906 × 1.535 in). From SKF catalogue PUB BU/P1 17000: dynamic C 380 kN, static C0 1060 kN, fatigue limit Pu 129 kN, reference speed 2,400 r/min, limiting speed 4,000 r/min, mass about 2750 g. Minimum axial load factor A 0.11 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29317",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29317",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29317-E",
      "29317 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29417-E",
    "brand": "SKF",
    "manufacturer_designation": "29417 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 1800,
    "fatigue_load_limit_kN": 212,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 6750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29417 E is a spherical roller thrust bearing to ISO 104 in the heavy 294 series: asymmetrical barrel rollers running on a sphered housing washer, sized 85×180×58 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. Reading the code: 294 gives the dimension series (heavy 294 series) and 17 the 85 mm shaft washer bore (code 17 × 5); the E sets the cage design. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Static safety matters for shock duty: compare peak axial force against C0 1800 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 85 mm bore the 294 bearing already weighs 6.8 kg and sits 58 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29417 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 735/1800 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.31 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 735/1800 kN ratings and 6750 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 29417 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.31 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 3,600 r/min."
      },
      {
        "q": "Which dimensions does the 29417 E have?",
        "a": "A 29417 E measures 85 mm bore × 180 mm outside diameter × 58 mm width (3.346 × 7.087 × 2.283 in). From SKF catalogue PUB BU/P1 17000: dynamic C 735 kN, static C0 1800 kN, fatigue limit Pu 212 kN, reference speed 2,000 r/min, limiting speed 3,600 r/min, mass about 6750 g. Minimum axial load factor A 0.31 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29417 E is the heavy 294 series, 85×180×58 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29417",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29417",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29417-E",
      "29417 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29318-E",
    "brand": "SKF",
    "manufacturer_designation": "29318 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 90,
    "D_mm": 155,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 400,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 132,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 2850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29318 E aligns itself: 90×155×39 mm envelope, 1080 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29318 E is the stamped steel E window cage. A minimum axial load of factor A 0.11 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. One direction only: 29318 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 90 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 400 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 90 mm bore the 293 bearing already weighs 2.9 kg and sits 39 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29318 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 400/1080 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.11 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 400/1080 kN ratings and 2850 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29318 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29318 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.11 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 4,000 r/min."
      },
      {
        "q": "Which dimensions does the 29318 E have?",
        "a": "A 29318 E measures 90 mm bore × 155 mm outside diameter × 39 mm width (3.543 × 6.102 × 1.535 in). From SKF catalogue PUB BU/P1 17000: dynamic C 400 kN, static C0 1080 kN, fatigue limit Pu 132 kN, reference speed 2,400 r/min, limiting speed 4,000 r/min, mass about 2850 g. Minimum axial load factor A 0.11 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29318",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×155×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29318",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29318-E",
      "29318 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29418-E",
    "brand": "SKF",
    "manufacturer_designation": "29418 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 815,
    "static_load_kN": 2000,
    "fatigue_load_limit_kN": 232,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 7750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29418 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 60 mm of axial section. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29418 E is the stamped steel E window cage. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Minimum axial load is explicit at factor A 0.38: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 90 mm bore the 294 bearing already weighs 7.8 kg and sits 60 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,900 r/min reference speed is the thermal criterion under load, the 3,400 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 815/2000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 815/2000 kN ratings and 7750 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 29418 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.38 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 3,400 r/min."
      },
      {
        "q": "Which dimensions does the 29418 E have?",
        "a": "A 29418 E measures 90 mm bore × 190 mm outside diameter × 60 mm width (3.543 × 7.48 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 815 kN, static C0 2000 kN, fatigue limit Pu 232 kN, reference speed 1,900 r/min, limiting speed 3,400 r/min, mass about 7750 g. Minimum axial load factor A 0.38 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29418 E is the heavy 294 series, 90×190×60 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29418",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29418",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29418-E",
      "29418 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29320-E",
    "brand": "SKF",
    "manufacturer_designation": "29320 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 100,
    "D_mm": 170,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 465,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 156,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 3650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29320 E aligns itself: 100×170×42 mm envelope, 1290 kN static rating, one load direction. In 29320 E, the 293 series fixes the 170 mm OD and 42 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 20 selects the 100 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Speed planning separates the 2,200 r/min thermal reference from the 3,600 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: fit the shaft washer tight on the 100 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 465 kN working load.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 100 mm bore the 293 bearing already weighs 3.6 kg and sits 42 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "the 2,200 r/min reference speed is the thermal criterion under load, the 3,600 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29320 E.",
      "Minimum load factor A 0.16 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 465/1290 kN ratings and 3650 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29320 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 20 the 100 mm bore (code 20 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 0.16) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.16 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29320 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29320 E mounted?",
        "a": "Tight shaft washer on the 100 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.16 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29320",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×170×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29320",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29320-E",
      "29320 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29420-E",
    "brand": "SKF",
    "manufacturer_designation": "29420 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 100,
    "D_mm": 210,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 980,
    "static_load_kN": 2500,
    "fatigue_load_limit_kN": 275,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29420 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 67 mm of axial section. Reading the code: 294 gives the dimension series (heavy 294 series) and 20 the 100 mm shaft washer bore (code 20 × 5); the E sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 2500 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 100 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 980 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 100 mm bore the 294 bearing already weighs 10.5 kg and sits 67 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,700 r/min reference speed is the thermal criterion under load, the 3,000 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 0.59 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29420 E.",
      "The 980/2500 kN ratings and 10500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29420 E is the heavy 294 series, 100×210×67 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29420 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29420 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.59 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 3,000 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29420",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×210×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29420",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29420-E",
      "29420 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29322-E",
    "brand": "SKF",
    "manufacturer_designation": "29322 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 110,
    "D_mm": 190,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 610,
    "static_load_kN": 1730,
    "fatigue_load_limit_kN": 204,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "weight_g": 5300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29322 E aligns itself: 110×190×48 mm envelope, 1730 kN static rating, one load direction. The designation 29322 E separates into 293 (series), 22 (110 mm bore) and E; washers are separable for individual mounting. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. One direction only: 29322 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 110 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 610 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 110 mm bore the 293 bearing already weighs 5.3 kg and sits 48 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "Minimum load factor A 0.28 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,900 r/min reference speed is the thermal criterion under load, the 3,200 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29322 E.",
      "The 610/1730 kN ratings and 5300 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29322 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 22 the 110 mm bore (code 22 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 0.28) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.28 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29322 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29322 E mounted?",
        "a": "Tight shaft washer on the 110 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.28 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29322",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×190×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29322",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29322-E",
      "29322 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29422-E",
    "brand": "SKF",
    "manufacturer_designation": "29422 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 110,
    "D_mm": 230,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1180,
    "static_load_kN": 3000,
    "fatigue_load_limit_kN": 325,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 13500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29422 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 73 mm of axial section. The designation 29422 E separates into 294 (series), 22 (110 mm bore) and E; washers are separable for individual mounting. A minimum axial load of factor A 0.86 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Minimum axial load is explicit at factor A 0.86: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 110 mm bore the 294 bearing already weighs 13.5 kg and sits 73 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 1180/3000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,600 r/min reference speed is the thermal criterion under load, the 2,800 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 1180/3000 kN ratings and 13500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 0.86) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.86 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29422 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29422 E mounted?",
        "a": "Tight shaft washer on the 110 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.86 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29422 E?",
        "a": "A 29422 E measures 110 mm bore × 230 mm outside diameter × 73 mm width (4.331 × 9.055 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1180 kN, static C0 3000 kN, fatigue limit Pu 325 kN, reference speed 1,600 r/min, limiting speed 2,800 r/min, mass about 13500 g. Minimum axial load factor A 0.86 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29422",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×230×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29422",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29422-E",
      "29422 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29324-E",
    "brand": "SKF",
    "manufacturer_designation": "29324 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 120,
    "D_mm": 210,
    "B_mm": 54,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 765,
    "static_load_kN": 2120,
    "fatigue_load_limit_kN": 245,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 7350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29324 E aligns itself: 120×210×54 mm envelope, 2120 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29324 E is the stamped steel E window cage. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Minimum axial load is explicit at factor A 0.43: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Mounting: fit the shaft washer tight on the 120 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 765 kN working load.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 120 mm bore the 293 bearing already weighs 7.3 kg and sits 54 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29324 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "the 1,700 r/min reference speed is the thermal criterion under load, the 2,800 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 0.43 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 765/2120 kN ratings and 7350 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29324 E is the medium 293 series, 120×210×54 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29324 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29324 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.43 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,800 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29324",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×210×54 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29324",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29324-E",
      "29324 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29424-E",
    "brand": "SKF",
    "manufacturer_designation": "29424 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 120,
    "D_mm": 250,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1370,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 375,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 17500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29424 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 78 mm of axial section. In 29424 E, the 294 series fixes the 250 mm OD and 78 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 24 selects the 120 mm seat. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Selection arithmetic: C 1370 kN against C0 3450 kN gives a C0/C ratio of 2.52 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 120 mm bore the 294 bearing already weighs 17.5 kg and sits 78 mm high — check the hook-nut thread and seat square-ness before trusting it with a lifted load.",
      "the 1,500 r/min reference speed is the thermal criterion under load, the 2,600 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29424 E.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "Minimum load factor A 1.1 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 1370/3450 kN ratings and 17500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 1.1) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 1.1 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29424 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29424 E mounted?",
        "a": "Tight shaft washer on the 120 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 1.1 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29424 E?",
        "a": "A 29424 E measures 120 mm bore × 250 mm outside diameter × 78 mm width (4.724 × 9.843 × 3.071 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1370 kN, static C0 3450 kN, fatigue limit Pu 375 kN, reference speed 1,500 r/min, limiting speed 2,600 r/min, mass about 17500 g. Minimum axial load factor A 1.1 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29424",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×250×78 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29424",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29424-E",
      "29424 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29326-E",
    "brand": "SKF",
    "manufacturer_designation": "29326 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 130,
    "D_mm": 225,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 865,
    "static_load_kN": 2500,
    "fatigue_load_limit_kN": 280,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 9000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29326 E aligns itself: 130×225×58 mm envelope, 2500 kN static rating, one load direction. Reading the code: 293 gives the dimension series (medium 293 series) and 26 the 130 mm shaft washer bore (code 26 × 5); the E sets the cage design. A minimum axial load of factor A 0.59 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Speed planning separates the 1,600 r/min thermal reference from the 2,600 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Large 293 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 130 mm bore, oil flow becomes the design variable: the 865 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,600 r/min reference speed is the thermal criterion under load, the 2,600 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29326 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 865/2500 kN ratings and 9000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29326 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29326 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.59 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,600 r/min."
      },
      {
        "q": "Which dimensions does the 29326 E have?",
        "a": "A 29326 E measures 130 mm bore × 225 mm outside diameter × 58 mm width (5.118 × 8.858 × 2.283 in). From SKF catalogue PUB BU/P1 17000: dynamic C 865 kN, static C0 2500 kN, fatigue limit Pu 280 kN, reference speed 1,600 r/min, limiting speed 2,600 r/min, mass about 9000 g. Minimum axial load factor A 0.59 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29326",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×225×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29326",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29326-E",
      "29326 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29426-E",
    "brand": "SKF",
    "manufacturer_designation": "29426 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 130,
    "D_mm": 270,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1560,
    "static_load_kN": 4050,
    "fatigue_load_limit_kN": 430,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 22000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29426 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 85 mm of axial section. Reading the code: 294 gives the dimension series (heavy 294 series) and 26 the 130 mm shaft washer bore (code 26 × 5); the E sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 4050 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 1.6) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 130 mm bore, oil flow becomes the design variable: the 1560 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 1560/4050 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1.6 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,400 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29426 E.",
      "The 1560/4050 kN ratings and 22000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 29426 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1.6 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,400 r/min."
      },
      {
        "q": "Which dimensions does the 29426 E have?",
        "a": "A 29426 E measures 130 mm bore × 270 mm outside diameter × 85 mm width (5.118 × 10.63 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1560 kN, static C0 4050 kN, fatigue limit Pu 430 kN, reference speed 1,300 r/min, limiting speed 2,400 r/min, mass about 22000 g. Minimum axial load factor A 1.6 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29426 E is the heavy 294 series, 130×270×85 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29426",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×270×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29426",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29426-E",
      "29426 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29328-E",
    "brand": "SKF",
    "manufacturer_designation": "29328 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 140,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 980,
    "static_load_kN": 2850,
    "fatigue_load_limit_kN": 315,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29328 E is the classic hook-block and screw-end thrust bearing: 140 mm shaft washer bore, 240 mm OD, minimum axial load factor A 0.77, and free rotation under load thanks to the spherical geometry. The designation 29328 E separates into 293 (series), 28 (140 mm bore) and E; washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 2850 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 0.77) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 140 mm bore, oil flow becomes the design variable: the 980 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 980/2850 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29328 E.",
      "Minimum load factor A 0.77 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 980/2850 kN ratings and 10500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 0.77) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.77 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29328 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29328 E mounted?",
        "a": "Tight shaft washer on the 140 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.77 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29328 E?",
        "a": "A 29328 E measures 140 mm bore × 240 mm outside diameter × 60 mm width (5.512 × 9.449 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 980 kN, static C0 2850 kN, fatigue limit Pu 315 kN, reference speed 1,500 r/min, limiting speed 2,600 r/min, mass about 10500 g. Minimum axial load factor A 0.77 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29328",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×240×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29328",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29328-E",
      "29328 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29428-E",
    "brand": "SKF",
    "manufacturer_designation": "29428 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 140,
    "D_mm": 280,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1630,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 455,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 23000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29428 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 85 mm of axial section. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29428 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Minimum axial load is explicit at factor A 1.8: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 1.8) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 140 mm bore, oil flow becomes the design variable: the 1630 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29428 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,400 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 1.8 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 1630/4300 kN ratings and 23000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 29428 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1.8 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,400 r/min."
      },
      {
        "q": "Which dimensions does the 29428 E have?",
        "a": "A 29428 E measures 140 mm bore × 280 mm outside diameter × 85 mm width (5.512 × 11.024 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1630 kN, static C0 4300 kN, fatigue limit Pu 455 kN, reference speed 1,300 r/min, limiting speed 2,400 r/min, mass about 23000 g. Minimum axial load factor A 1.8 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29428 E is the heavy 294 series, 140×280×85 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29428",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×280×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29428",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29428-E",
      "29428 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29230-E",
    "brand": "SKF",
    "manufacturer_designation": "29230 E",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 150,
    "D_mm": 215,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 408,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 180,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 4300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29230 E for very heavy one-direction axial load: 408 kN dynamic and 1600 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29230 E is the stamped steel E window cage. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Minimum axial load is explicit at factor A 0.24: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 0.24) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 150 mm bore, oil flow becomes the design variable: the 408 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 408/1600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.24 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,800 r/min reference speed is the thermal criterion under load, the 2,800 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "The 408/1600 kN ratings and 4300 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.24 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,800 r/min."
      },
      {
        "q": "Which dimensions does the 29230 E have?",
        "a": "A 29230 E measures 150 mm bore × 215 mm outside diameter × 39 mm width (5.906 × 8.465 × 1.535 in). From SKF catalogue PUB BU/P1 17000: dynamic C 408 kN, static C0 1600 kN, fatigue limit Pu 180 kN, reference speed 1,800 r/min, limiting speed 2,800 r/min, mass about 4300 g. Minimum axial load factor A 0.24 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29230 E is the high-speed 292 series, 150×215×39 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29230 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29230",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×215×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29230",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29230-E",
      "29230 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29330-E",
    "brand": "SKF",
    "manufacturer_designation": "29330 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 2850,
    "fatigue_load_limit_kN": 315,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29330 E aligns itself: 150×250×60 mm envelope, 2850 kN static rating, one load direction. In 29330 E, the 293 series fixes the 250 mm OD and 60 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 30 selects the 150 mm seat. The medium 293 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Selection arithmetic: C 1000 kN against C0 2850 kN gives a C0/C ratio of 2.85 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: fit the shaft washer tight on the 150 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 1000 kN working load.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 150 mm bore, oil flow becomes the design variable: the 1000 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 1000/2850 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.77 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 1000/2850 kN ratings and 11000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 29330 E?",
        "a": "A 29330 E measures 150 mm bore × 250 mm outside diameter × 60 mm width (5.906 × 9.843 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1000 kN, static C0 2850 kN, fatigue limit Pu 315 kN, reference speed 1,500 r/min, limiting speed 2,400 r/min, mass about 11000 g. Minimum axial load factor A 0.77 must be maintained in service."
      },
      {
        "q": "How is the 29330 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 30 the 150 mm bore (code 30 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 0.77) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.77 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29330 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29330",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×250×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29330",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29330-E",
      "29330 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29430-E",
    "brand": "SKF",
    "manufacturer_designation": "29430 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 150,
    "D_mm": 300,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1860,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 520,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 28000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29430 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 90 mm of axial section. In 29430 E, the 294 series fixes the 300 mm OD and 90 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 30 selects the 150 mm seat. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. The 28000 g mass and 90 mm axial height sit between 150 and 300 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 150 mm bore, oil flow becomes the design variable: the 1860 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "the 1,200 r/min reference speed is the thermal criterion under load, the 2,200 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29430 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 1860/5100 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 1860/5100 kN ratings and 28000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29430 E designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 30 the 150 mm bore (code 30 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 2.5) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 2.5 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29430 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29430 E mounted?",
        "a": "Tight shaft washer on the 150 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 2.5 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29430",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×300×90 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29430",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29430-E",
      "29430 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29332-E",
    "brand": "SKF",
    "manufacturer_designation": "29332 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1180,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 375,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29332 E aligns itself: 160×270×67 mm envelope, 3450 kN static rating, one load direction. Reading the code: 293 gives the dimension series (medium 293 series) and 32 the 160 mm shaft washer bore (code 32 × 5); the E sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 3450 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 293 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 160 mm bore, oil flow becomes the design variable: the 1180 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,200 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 1.1 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29332 E.",
      "The 1180/3450 kN ratings and 14500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29332 E is the medium 293 series, 160×270×67 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29332 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29332 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1.1 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,200 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29332",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×270×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29332",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29332-E",
      "29332 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29432-E",
    "brand": "SKF",
    "manufacturer_designation": "29432 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 160,
    "D_mm": 320,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2080,
    "static_load_kN": 5600,
    "fatigue_load_limit_kN": 570,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 32000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29432 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 95 mm of axial section. The designation 29432 E separates into 294 (series), 32 (160 mm bore) and E; washers are separable for individual mounting. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Minimum axial load is explicit at factor A 3: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 3) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 160 mm bore, oil flow becomes the design variable: the 2080 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Minimum load factor A 3 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 2080/5600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "the 1,100 r/min reference speed is the thermal criterion under load, the 2,000 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 2080/5600 kN ratings and 32000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 3) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 3 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29432 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29432 E mounted?",
        "a": "Tight shaft washer on the 160 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 3 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29432 E?",
        "a": "A 29432 E measures 160 mm bore × 320 mm outside diameter × 95 mm width (6.299 × 12.598 × 3.74 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2080 kN, static C0 5600 kN, fatigue limit Pu 570 kN, reference speed 1,100 r/min, limiting speed 2,000 r/min, mass about 32000 g. Minimum axial load factor A 3 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29432",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×320×95 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29432",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29432-E",
      "29432 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29334-E",
    "brand": "SKF",
    "manufacturer_designation": "29334 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1200,
    "static_load_kN": 3550,
    "fatigue_load_limit_kN": 365,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 15000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29334 E is the classic hook-block and screw-end thrust bearing: 170 mm shaft washer bore, 280 mm OD, minimum axial load factor A 1.2, and free rotation under load thanks to the spherical geometry. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29334 E is the stamped steel E window cage. The medium 293 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Minimum axial load is explicit at factor A 1.2: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 1.2) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 170 mm bore, oil flow becomes the design variable: the 1200 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 1200/3550 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1.2 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,200 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "The 1200/3550 kN ratings and 15000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29334 E is the medium 293 series, 170×280×67 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29334 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29334 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1.2 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,200 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29334",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×280×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29334-E",
      "29334 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29434-E",
    "brand": "SKF",
    "manufacturer_designation": "29434 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 170,
    "D_mm": 340,
    "B_mm": 103,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2360,
    "static_load_kN": 6550,
    "fatigue_load_limit_kN": 640,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "weight_g": 44500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29434 E carries 2360 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 170 mm shafts. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29434 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. One direction only: 29434 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 170 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 2360 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 170 mm bore, oil flow becomes the design variable: the 2360 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29434 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 2360/6550 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 4.1 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 2360/6550 kN ratings and 44500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29434 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29434 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 4.1 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,900 r/min."
      },
      {
        "q": "Which dimensions does the 29434 E have?",
        "a": "A 29434 E measures 170 mm bore × 340 mm outside diameter × 103 mm width (6.693 × 13.386 × 4.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2360 kN, static C0 6550 kN, fatigue limit Pu 640 kN, reference speed 1,100 r/min, limiting speed 1,900 r/min, mass about 44500 g. Minimum axial load factor A 4.1 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29434",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×340×103 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29434",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29434-E",
      "29434 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29236-E",
    "brand": "SKF",
    "manufacturer_designation": "29236 E",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 495,
    "static_load_kN": 2040,
    "fatigue_load_limit_kN": 212,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 5800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29236 E is a spherical roller thrust bearing to ISO 104 in the high-speed 292 series: asymmetrical barrel rollers running on a sphered housing washer, sized 180×250×42 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. In 29236 E, the 292 series fixes the 250 mm OD and 42 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 36 selects the 180 mm seat. A minimum axial load of factor A 0.4 must be maintained — in the large 292 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 5800 g mass and 42 mm axial height sit between 180 and 250 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 0.4) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 180 mm bore, oil flow becomes the design variable: the 495 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 495/2040 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "the 1,600 r/min reference speed is the thermal criterion under load, the 2,600 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29236 E.",
      "The 495/2040 kN ratings and 5800 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29236 E designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 36 the 180 mm bore (code 36 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 0.4) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.4 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29236 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29236 E mounted?",
        "a": "Tight shaft washer on the 180 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 0.4 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29236",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "29236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29236-E",
      "29236 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29336-E",
    "brand": "SKF",
    "manufacturer_designation": "29336 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1430,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 440,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 19500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29336 E is the classic hook-block and screw-end thrust bearing: 180 mm shaft washer bore, 300 mm OD, minimum axial load factor A 1.8, and free rotation under load thanks to the spherical geometry. In 29336 E, the 293 series fixes the 300 mm OD and 73 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 36 selects the 180 mm seat. A minimum axial load of factor A 1.8 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. One direction only: 29336 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Verify the minimum axial load (factor A 1.8) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 180 mm bore, oil flow becomes the design variable: the 1430 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "the 1,200 r/min reference speed is the thermal criterion under load, the 2,000 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29336 E.",
      "Minimum load factor A 1.8 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 1430/4300 kN ratings and 19500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29336 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 36 the 180 mm bore (code 36 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 1.8) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 1.8 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29336 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29336 E mounted?",
        "a": "Tight shaft washer on the 180 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 1.8 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29336",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×300×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29336-E",
      "29336 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29436-E",
    "brand": "SKF",
    "manufacturer_designation": "29436 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 180,
    "D_mm": 360,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2600,
    "static_load_kN": 7350,
    "fatigue_load_limit_kN": 710,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "weight_g": 52500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29436 E carries 2600 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 180 mm shafts. Reading the code: 294 gives the dimension series (heavy 294 series) and 36 the 180 mm shaft washer bore (code 36 × 5); the E sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. The 52500 g mass and 109 mm axial height sit between 180 and 360 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 180 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 2600 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 180 mm bore, oil flow becomes the design variable: the 2600 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,000 r/min reference speed is the thermal criterion under load, the 1,800 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 2600/7350 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 5.1 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 2600/7350 kN ratings and 52500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 924); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29436 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29436 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 5.1 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,800 r/min."
      },
      {
        "q": "Which dimensions does the 29436 E have?",
        "a": "A 29436 E measures 180 mm bore × 360 mm outside diameter × 109 mm width (7.087 × 14.173 × 4.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2600 kN, static C0 7350 kN, fatigue limit Pu 710 kN, reference speed 1,000 r/min, limiting speed 1,800 r/min, mass about 52500 g. Minimum axial load factor A 5.1 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29436",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×360×109 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29436",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29436-E",
      "29436 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29338-E",
    "brand": "SKF",
    "manufacturer_designation": "29338 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1630,
    "static_load_kN": 4750,
    "fatigue_load_limit_kN": 490,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "weight_g": 23500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29338 E is the classic hook-block and screw-end thrust bearing: 190 mm shaft washer bore, 320 mm OD, minimum axial load factor A 2.1, and free rotation under load thanks to the spherical geometry. The designation 29338 E separates into 293 (series), 38 (190 mm bore) and E; washers are separable for individual mounting. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Static safety matters for shock duty: compare peak axial force against C0 4750 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 190 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 1630 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 190 mm bore, oil flow becomes the design variable: the 1630 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Minimum load factor A 2.1 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,100 r/min reference speed is the thermal criterion under load, the 1,900 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29338 E.",
      "The 1630/4750 kN ratings and 23500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 2.1) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 2.1 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29338 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29338 E mounted?",
        "a": "Tight shaft washer on the 190 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 2.1 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29338 E?",
        "a": "A 29338 E measures 190 mm bore × 320 mm outside diameter × 78 mm width (7.48 × 12.598 × 3.071 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1630 kN, static C0 4750 kN, fatigue limit Pu 490 kN, reference speed 1,100 r/min, limiting speed 1,900 r/min, mass about 23500 g. Minimum axial load factor A 2.1 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29338",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×320×78 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29338-E",
      "29338 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29438-E",
    "brand": "SKF",
    "manufacturer_designation": "29438 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 190,
    "D_mm": 380,
    "B_mm": 115,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2850,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 765,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 60500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29438 E carries 2850 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 190 mm shafts. The designation 29438 E separates into 294 (series), 38 (190 mm bore) and E; washers are separable for individual mounting. A minimum axial load of factor A 6.1 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Speed planning separates the 950 r/min thermal reference from the 1,700 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 190 mm bore, oil flow becomes the design variable: the 2850 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 2850/8000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 6.1 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 2850/8000 kN ratings and 60500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29438 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29438 E mounted?",
        "a": "Tight shaft washer on the 190 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 6.1 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29438 E?",
        "a": "A 29438 E measures 190 mm bore × 380 mm outside diameter × 115 mm width (7.48 × 14.961 × 4.528 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2850 kN, static C0 8000 kN, fatigue limit Pu 765 kN, reference speed 950 r/min, limiting speed 1,700 r/min, mass about 60500 g. Minimum axial load factor A 6.1 must be maintained in service."
      },
      {
        "q": "How is the 29438 E designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 38 the 190 mm bore (code 38 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29438",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×380×115 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29438",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29438-E",
      "29438 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29240-E",
    "brand": "SKF",
    "manufacturer_designation": "29240 E",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 656,
    "static_load_kN": 2650,
    "fatigue_load_limit_kN": 285,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 9300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29240 E is a spherical roller thrust bearing to ISO 104 in the high-speed 292 series: asymmetrical barrel rollers running on a sphered housing washer, sized 200×280×48 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29240 E is the stamped steel E window cage. The high-speed 292 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Minimum axial load is explicit at factor A 0.67: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 200 mm bore, oil flow becomes the design variable: the 656 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,400 r/min reference speed is the thermal criterion under load, the 2,200 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 656/2650 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 656/2650 kN ratings and 9300 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 0.67 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 2,200 r/min."
      },
      {
        "q": "Which dimensions does the 29240 E have?",
        "a": "A 29240 E measures 200 mm bore × 280 mm outside diameter × 48 mm width (7.874 × 11.024 × 1.89 in). From SKF catalogue PUB BU/P1 17000: dynamic C 656 kN, static C0 2650 kN, fatigue limit Pu 285 kN, reference speed 1,400 r/min, limiting speed 2,200 r/min, mass about 9300 g. Minimum axial load factor A 0.67 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29240 E is the high-speed 292 series, 200×280×48 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29240 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29240",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×280×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29240-E",
      "29240 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29340-E",
    "brand": "SKF",
    "manufacturer_designation": "29340 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1860,
    "static_load_kN": 5500,
    "fatigue_load_limit_kN": 550,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 28500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29340 E is the classic hook-block and screw-end thrust bearing: 200 mm shaft washer bore, 340 mm OD, minimum axial load factor A 2.9, and free rotation under load thanks to the spherical geometry. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29340 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. One direction only: 29340 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Verify the minimum axial load (factor A 2.9) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 200 mm bore, oil flow becomes the design variable: the 1860 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 1860/5500 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 2.9 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29340 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 1860/5500 kN ratings and 28500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 29340 E have?",
        "a": "A 29340 E measures 200 mm bore × 340 mm outside diameter × 85 mm width (7.874 × 13.386 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1860 kN, static C0 5500 kN, fatigue limit Pu 550 kN, reference speed 1,000 r/min, limiting speed 1,700 r/min, mass about 28500 g. Minimum axial load factor A 2.9 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29340 E is the medium 293 series, 200×340×85 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29340 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29340 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29340",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×340×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29340-E",
      "29340 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29440-E",
    "brand": "SKF",
    "manufacturer_designation": "29440 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 200,
    "D_mm": 400,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3200,
    "static_load_kN": 9000,
    "fatigue_load_limit_kN": 850,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "weight_g": 72000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29440 E carries 3200 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 200 mm shafts. In 29440 E, the 294 series fixes the 400 mm OD and 122 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 40 selects the 200 mm seat. A minimum axial load of factor A 7.7 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 72000 g mass and 122 mm axial height sit between 200 and 400 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 200 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 3200 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 200 mm bore, oil flow becomes the design variable: the 3200 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 3200/9000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "the 850 r/min reference speed is the thermal criterion under load, the 1,600 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29440 E.",
      "The 3200/9000 kN ratings and 72000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29440 E designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 40 the 200 mm bore (code 40 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 7.7) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 7.7 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29440 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29440 E mounted?",
        "a": "Tight shaft washer on the 200 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 7.7 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29440",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×400×122 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29440",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29440-E",
      "29440 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29244-E",
    "brand": "SKF",
    "manufacturer_designation": "29244 E",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 690,
    "static_load_kN": 3000,
    "fatigue_load_limit_kN": 310,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29244 E is a spherical roller thrust bearing to ISO 104 in the high-speed 292 series: asymmetrical barrel rollers running on a sphered housing washer, sized 220×300×48 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. The designation 29244 E separates into 292 (series), 44 (220 mm bore) and E; washers are separable for individual mounting. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Static safety matters for shock duty: compare peak axial force against C0 3000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 0.86) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 220 mm bore, oil flow becomes the design variable: the 690 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "the 1,300 r/min reference speed is the thermal criterion under load, the 2,200 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29244 E.",
      "The 690/3000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 0.86 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 690/3000 kN ratings and 10000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 29244 E?",
        "a": "A 29244 E measures 220 mm bore × 300 mm outside diameter × 48 mm width (8.661 × 11.811 × 1.89 in). From SKF catalogue PUB BU/P1 17000: dynamic C 690 kN, static C0 3000 kN, fatigue limit Pu 310 kN, reference speed 1,300 r/min, limiting speed 2,200 r/min, mass about 10000 g. Minimum axial load factor A 0.86 must be maintained in service."
      },
      {
        "q": "How is the 29244 E designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 44 the 220 mm bore (code 44 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 0.86) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 0.86 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29244 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29244",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×300×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29244-E",
      "29244 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29344-E",
    "brand": "SKF",
    "manufacturer_designation": "29344 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 220,
    "D_mm": 360,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2000,
    "static_load_kN": 6300,
    "fatigue_load_limit_kN": 610,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 31000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29344 E is the classic hook-block and screw-end thrust bearing: 220 mm shaft washer bore, 360 mm OD, minimum axial load factor A 3.8, and free rotation under load thanks to the spherical geometry. The designation 29344 E separates into 293 (series), 44 (220 mm bore) and E; washers are separable for individual mounting. A minimum axial load of factor A 3.8 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Speed planning separates the 1,000 r/min thermal reference from the 1,700 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: fit the shaft washer tight on the 220 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 2000 kN working load.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 220 mm bore, oil flow becomes the design variable: the 2000 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Minimum load factor A 3.8 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 2000/6300 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 2000/6300 kN ratings and 31000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29344 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 44 the 220 mm bore (code 44 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 3.8) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 3.8 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29344 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29344 E mounted?",
        "a": "Tight shaft washer on the 220 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 3.8 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29344",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×360×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29344-E",
      "29344 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29444-E",
    "brand": "SKF",
    "manufacturer_designation": "29444 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 220,
    "D_mm": 420,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3350,
    "static_load_kN": 9650,
    "fatigue_load_limit_kN": 900,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "weight_g": 75000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29444 E carries 3350 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 220 mm shafts. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29444 E is the stamped steel E window cage. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. One direction only: 29444 E cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 220 mm bore, oil flow becomes the design variable: the 3350 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 3350/9650 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 8.8 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29444 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 3350/9650 kN ratings and 75000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29444 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29444 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 8.8 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,500 r/min."
      },
      {
        "q": "Which dimensions does the 29444 E have?",
        "a": "A 29444 E measures 220 mm bore × 420 mm outside diameter × 122 mm width (8.661 × 16.535 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3350 kN, static C0 9650 kN, fatigue limit Pu 900 kN, reference speed 850 r/min, limiting speed 1,500 r/min, mass about 75000 g. Minimum axial load factor A 8.8 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29444",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×420×122 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29444",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29444-E",
      "29444 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29248",
    "brand": "SKF",
    "manufacturer_designation": "29248",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 240,
    "D_mm": 340,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 799,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 335,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "weight_g": 16500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29248 is the classic hook-block and screw-end thrust bearing: 240 mm shaft washer bore, 340 mm OD, minimum axial load factor A 1.1, and free rotation under load thanks to the spherical geometry. The designation 29248 separates into 292 (series), 48 (240 mm bore) and no suffix (earlier standard design); washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 3450 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 240 mm bore, oil flow becomes the design variable: the 799 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "the 1,100 r/min reference speed is the thermal criterion under load, the 1,800 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29248.",
      "The 799/3450 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1.1 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 799/3450 kN ratings and 16500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 29248?",
        "a": "A 29248 measures 240 mm bore × 340 mm outside diameter × 60 mm width (9.449 × 13.386 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 799 kN, static C0 3450 kN, fatigue limit Pu 335 kN, reference speed 1,100 r/min, limiting speed 1,800 r/min, mass about 16500 g. Minimum axial load factor A 1.1 must be maintained in service."
      },
      {
        "q": "How is the 29248 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 48 the 240 mm bore (code 48 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 1.1) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 1.1 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29248 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29248-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 240×340×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29248",
      "29248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29348-E",
    "brand": "SKF",
    "manufacturer_designation": "29348 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 240,
    "D_mm": 380,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2040,
    "static_load_kN": 6550,
    "fatigue_load_limit_kN": 630,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "weight_g": 35500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29348 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 85 mm of axial section. Reading the code: 293 gives the dimension series (medium 293 series) and 48 the 240 mm shaft washer bore (code 48 × 5); the E sets the cage design. A minimum axial load of factor A 4.1 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 35500 g mass and 85 mm axial height sit between 240 and 380 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 4.1) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 240 mm bore, oil flow becomes the design variable: the 2040 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 1,000 r/min reference speed is the thermal criterion under load, the 1,600 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "The 2040/6550 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 4.1 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 2040/6550 kN ratings and 35500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29348 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29348 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 4.1 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,600 r/min."
      },
      {
        "q": "Which dimensions does the 29348 E have?",
        "a": "A 29348 E measures 240 mm bore × 380 mm outside diameter × 85 mm width (9.449 × 14.961 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2040 kN, static C0 6550 kN, fatigue limit Pu 630 kN, reference speed 1,000 r/min, limiting speed 1,600 r/min, mass about 35500 g. Minimum axial load factor A 4.1 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29348",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 240×380×85 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29348-E",
      "29348 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29448-E",
    "brand": "SKF",
    "manufacturer_designation": "29448 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3400,
    "static_load_kN": 10200,
    "fatigue_load_limit_kN": 930,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "weight_g": 80000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29448 E for very heavy one-direction axial load: 3400 kN dynamic and 10200 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. The designation 29448 E separates into 294 (series), 48 (240 mm bore) and E; washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Speed planning separates the 850 r/min thermal reference from the 1,500 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: fit the shaft washer tight on the 240 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 3400 kN working load.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 240 mm bore, oil flow becomes the design variable: the 3400 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Minimum load factor A 9.9 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 3400/10200 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 3400/10200 kN ratings and 80000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29448 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29448 E mounted?",
        "a": "Tight shaft washer on the 240 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 9.9 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29448 E?",
        "a": "A 29448 E measures 240 mm bore × 440 mm outside diameter × 122 mm width (9.449 × 17.323 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3400 kN, static C0 10200 kN, fatigue limit Pu 930 kN, reference speed 850 r/min, limiting speed 1,500 r/min, mass about 80000 g. Minimum axial load factor A 9.9 must be maintained in service."
      },
      {
        "q": "How is the 29448 E designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 48 the 240 mm bore (code 48 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29448",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 240×440×122 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29448",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29448-E",
      "29448 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29252",
    "brand": "SKF",
    "manufacturer_designation": "29252",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 817,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 345,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 18500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29252 for very heavy one-direction axial load: 817 kN dynamic and 3650 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29252 is the steel cage of the earlier standard design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 3650 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 260 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 817 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 260 mm bore, oil flow becomes the design variable: the 817 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29252.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 817/3650 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1.3 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 817/3650 kN ratings and 18500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 29252 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1.3 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,700 r/min."
      },
      {
        "q": "Which dimensions does the 29252 have?",
        "a": "A 29252 measures 260 mm bore × 360 mm outside diameter × 60 mm width (10.236 × 14.173 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 817 kN, static C0 3650 kN, fatigue limit Pu 345 kN, reference speed 1,100 r/min, limiting speed 1,700 r/min, mass about 18500 g. Minimum axial load factor A 1.3 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29252 is the high-speed 292 series, 260×360×60 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29252-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 260×360×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29252",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29252",
      "29252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29352-E",
    "brand": "SKF",
    "manufacturer_designation": "29352 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 260,
    "D_mm": 420,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2550,
    "static_load_kN": 8300,
    "fatigue_load_limit_kN": 780,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 49000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29352 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 95 mm of axial section. In 29352 E, the 293 series fixes the 420 mm OD and 95 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 52 selects the 260 mm seat. The medium 293 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Minimum axial load is explicit at factor A 6.5: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 293 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the stamped steel E window cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 260 mm bore, oil flow becomes the design variable: the 2550 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 2550/8300 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 850 r/min reference speed is the thermal criterion under load, the 1,400 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "The 2550/8300 kN ratings and 49000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 29352 E?",
        "a": "A 29352 E measures 260 mm bore × 420 mm outside diameter × 95 mm width (10.236 × 16.535 × 3.74 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2550 kN, static C0 8300 kN, fatigue limit Pu 780 kN, reference speed 850 r/min, limiting speed 1,400 r/min, mass about 49000 g. Minimum axial load factor A 6.5 must be maintained in service."
      },
      {
        "q": "How is the 29352 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 52 the 260 mm bore (code 52 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 6.5) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 6.5 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29352 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29352",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 260×420×95 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29352-E",
      "29352 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29452-E",
    "brand": "SKF",
    "manufacturer_designation": "29452 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4050,
    "static_load_kN": 12900,
    "fatigue_load_limit_kN": 1080,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 105000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29452 E for very heavy one-direction axial load: 4050 kN dynamic and 12900 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. Reading the code: 294 gives the dimension series (heavy 294 series) and 52 the 260 mm shaft washer bore (code 52 × 5); the E sets the cage design. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Selection arithmetic: C 4050 kN against C0 12900 kN gives a C0/C ratio of 3.19 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Verify the minimum axial load (factor A 16) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 260 mm bore, oil flow becomes the design variable: the 4050 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29452 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 16 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 4050/12900 kN ratings and 105000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29452 E is the heavy 294 series, 260×480×132 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29452 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29452 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 16 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,300 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29452",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 260×480×132 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29452",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29452-E",
      "29452 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29256",
    "brand": "SKF",
    "manufacturer_designation": "29256",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 863,
    "static_load_kN": 4000,
    "fatigue_load_limit_kN": 375,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 19500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29256 aligns itself: 280×380×60 mm envelope, 4000 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29256 is the steel cage of the earlier standard design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 4000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 280 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 863 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 280 mm bore, oil flow becomes the design variable: the 863 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 863/4000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1.5 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "the 1,000 r/min reference speed is the thermal criterion under load, the 1,700 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29256.",
      "The 863/4000 kN ratings and 19500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1.5 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,700 r/min."
      },
      {
        "q": "Which dimensions does the 29256 have?",
        "a": "A 29256 measures 280 mm bore × 380 mm outside diameter × 60 mm width (11.024 × 14.961 × 2.362 in). From SKF catalogue PUB BU/P1 17000: dynamic C 863 kN, static C0 4000 kN, fatigue limit Pu 375 kN, reference speed 1,000 r/min, limiting speed 1,700 r/min, mass about 19500 g. Minimum axial load factor A 1.5 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29256 is the high-speed 292 series, 280×380×60 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29256?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29256-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 280×380×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29256",
      "29256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29356-E",
    "brand": "SKF",
    "manufacturer_designation": "29356 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 280,
    "D_mm": 440,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2550,
    "static_load_kN": 8650,
    "fatigue_load_limit_kN": 800,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 53000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29356 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 95 mm of axial section. SKF suffixes on spherical roller thrust bearings describe cages: E the standard stamped steel window cage, EM the machined brass execution, EF the extra-large steel-cage design; 29356 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Static safety matters for shock duty: compare peak axial force against C0 8650 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 7.1) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 280 mm bore, oil flow becomes the design variable: the 2550 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The 2550/8650 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 7.1 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "the 850 r/min reference speed is the thermal criterion under load, the 1,400 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29356 E.",
      "The 2550/8650 kN ratings and 53000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29356 E is the medium 293 series, 280×440×95 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29356 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29356 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 7.1 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,400 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29356",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 280×440×95 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29356-E",
      "29356 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29456-E",
    "brand": "SKF",
    "manufacturer_designation": "29456 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 280,
    "D_mm": 520,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4900,
    "static_load_kN": 15300,
    "fatigue_load_limit_kN": 1320,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 135000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29456 E for very heavy one-direction axial load: 4900 kN dynamic and 15300 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. In 29456 E, the 294 series fixes the 520 mm OD and 145 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 56 selects the 280 mm seat. A minimum axial load of factor A 22 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Minimum axial load is explicit at factor A 22: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Mounting: fit the shaft washer tight on the 280 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 4900 kN working load.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 280 mm bore, oil flow becomes the design variable: the 4900 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 4900/15300 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 670 r/min reference speed is the thermal criterion under load, the 1,200 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 4900/15300 kN ratings and 135000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 22) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 22 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29456 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29456 E mounted?",
        "a": "Tight shaft washer on the 280 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 22 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29456 E?",
        "a": "A 29456 E measures 280 mm bore × 520 mm outside diameter × 145 mm width (11.024 × 20.472 × 5.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4900 kN, static C0 15300 kN, fatigue limit Pu 1320 kN, reference speed 670 r/min, limiting speed 1,200 r/min, mass about 135000 g. Minimum axial load factor A 22 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29456",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 280×520×145 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29456",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29456-E",
      "29456 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29260",
    "brand": "SKF",
    "manufacturer_designation": "29260",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1070,
    "static_load_kN": 4800,
    "fatigue_load_limit_kN": 465,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 30500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The high-speed 292 series bearing 29260 carries 1070 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 300 mm shafts. In 29260, the 292 series fixes the 420 mm OD and 73 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 60 selects the 300 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 4800 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 2.2) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 300 mm bore, oil flow becomes the design variable: the 1070 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "Minimum load factor A 2.2 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 900 r/min reference speed is the thermal criterion under load, the 1,400 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29260.",
      "The 1070/4800 kN ratings and 30500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 2.2) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 2.2 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29260 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29260 mounted?",
        "a": "Tight shaft washer on the 300 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 2.2 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29260?",
        "a": "A 29260 measures 300 mm bore × 420 mm outside diameter × 73 mm width (11.811 × 16.535 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1070 kN, static C0 4800 kN, fatigue limit Pu 465 kN, reference speed 900 r/min, limiting speed 1,400 r/min, mass about 30500 g. Minimum axial load factor A 2.2 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29260-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 300×420×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29260",
      "29260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29360-E",
    "brand": "SKF",
    "manufacturer_designation": "29360 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 300,
    "D_mm": 480,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3100,
    "static_load_kN": 10600,
    "fatigue_load_limit_kN": 930,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 75000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29360 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 109 mm of axial section. The designation 29360 E separates into 293 (series), 60 (300 mm bore) and E; washers are separable for individual mounting. The medium 293 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Static safety matters for shock duty: compare peak axial force against C0 10600 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 11) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 300 mm bore, oil flow becomes the design variable: the 3100 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "the 750 r/min reference speed is the thermal criterion under load, the 1,200 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29360 E.",
      "The 3100/10600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 11 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 3100/10600 kN ratings and 75000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 29360 E?",
        "a": "A 29360 E measures 300 mm bore × 480 mm outside diameter × 109 mm width (11.811 × 18.898 × 4.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3100 kN, static C0 10600 kN, fatigue limit Pu 930 kN, reference speed 750 r/min, limiting speed 1,200 r/min, mass about 75000 g. Minimum axial load factor A 11 must be maintained in service."
      },
      {
        "q": "How is the 29360 E designation read?",
        "a": "293 is the dimension series (medium 293 series) and 60 the 300 mm bore (code 60 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 11) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 11 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29360 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29360",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 300×480×109 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29360",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29360-E",
      "29360 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29460-E",
    "brand": "SKF",
    "manufacturer_designation": "29460 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5000,
    "static_load_kN": 16600,
    "fatigue_load_limit_kN": 1340,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29460 E for very heavy one-direction axial load: 5000 kN dynamic and 16600 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29460 E is the stamped steel E window cage. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Minimum axial load is explicit at factor A 24: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Mounting: fit the shaft washer tight on the 300 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 5000 kN working load.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 300 mm bore, oil flow becomes the design variable: the 5000 kN rating assumes fresh oil at the contact, and a blocked feed groove halves real life.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 670 r/min reference speed is the thermal criterion under load, the 1,200 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 5000/16600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 5000/16600 kN ratings and 140000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29460 E is the heavy 294 series, 300×540×145 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29460 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29460 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 24 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,200 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29460",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 300×540×145 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29460",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29460-E",
      "29460 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29264",
    "brand": "SKF",
    "manufacturer_designation": "29264",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1110,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 465,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 33000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29264 is a spherical roller thrust bearing to ISO 104 in the high-speed 292 series: asymmetrical barrel rollers running on a sphered housing washer, sized 320×440×73 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. In 29264, the 292 series fixes the 440 mm OD and 73 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 64 selects the 320 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 5100 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 2.5) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 2.5 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 440 mm washer track.",
      "the 850 r/min reference speed is the thermal criterion under load, the 1,400 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29264.",
      "The 1110/5100 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 2.5 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 1110/5100 kN ratings and 33000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29264 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29264 mounted?",
        "a": "Tight shaft washer on the 320 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 2.5 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29264?",
        "a": "A 29264 measures 320 mm bore × 440 mm outside diameter × 73 mm width (12.598 × 17.323 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1110 kN, static C0 5100 kN, fatigue limit Pu 465 kN, reference speed 850 r/min, limiting speed 1,400 r/min, mass about 33000 g. Minimum axial load factor A 2.5 must be maintained in service."
      },
      {
        "q": "How is the 29264 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 64 the 320 mm bore (code 64 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29264-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 320×440×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29264",
      "29264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29364-E",
    "brand": "SKF",
    "manufacturer_designation": "29364 E",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 320,
    "D_mm": 500,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3350,
    "static_load_kN": 11200,
    "fatigue_load_limit_kN": 1000,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 78000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29364 E denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the stamped steel E window cage guides the rollers under 109 mm of axial section. Reading the code: 293 gives the dimension series (medium 293 series) and 64 the 320 mm shaft washer bore (code 64 × 5); the E sets the cage design. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Selection arithmetic: C 3350 kN against C0 11200 kN gives a C0/C ratio of 3.34 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: fit the shaft washer tight on the 320 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 3350 kN working load.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 12 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 500 mm washer track.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29364 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 12 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 3350/11200 kN ratings and 78000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29364 E is the medium 293 series, 320×500×109 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29364 E?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the stamped steel E window cage."
      },
      {
        "q": "Where is the 29364 E typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 12 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,200 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29364",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 320×500×109 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29364",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29364-E",
      "29364 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29464-E",
    "brand": "SKF",
    "manufacturer_designation": "29464 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5700,
    "static_load_kN": 19000,
    "fatigue_load_limit_kN": 1530,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 175000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29464 E for very heavy one-direction axial load: 5700 kN dynamic and 19000 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. The designation 29464 E separates into 294 (series), 64 (320 mm bore) and E; washers are separable for individual mounting. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. The 175000 g mass and 155 mm axial height sit between 320 and 580 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 320 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 5700 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 32 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 580 mm washer track.",
      "the 600 r/min reference speed is the thermal criterion under load, the 1,100 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29464 E.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 5700/19000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 5700/19000 kN ratings and 175000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29464 E designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 64 the 320 mm bore (code 64 × 5); E is the cage execution (stamped steel E window cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 32) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 32 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29464 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29464 E mounted?",
        "a": "Tight shaft washer on the 320 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 32 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29464",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 320×580×155 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "29464",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29464-E",
      "29464 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29268",
    "brand": "SKF",
    "manufacturer_designation": "29268",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1130,
    "static_load_kN": 5400,
    "fatigue_load_limit_kN": 480,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 33500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29268 is the classic hook-block and screw-end thrust bearing: 340 mm shaft washer bore, 460 mm OD, minimum axial load factor A 2.8, and free rotation under load thanks to the spherical geometry. In 29268, the 292 series fixes the 460 mm OD and 73 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 68 selects the 340 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 5400 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 2.8) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 2.8 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 460 mm washer track.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 1130/5400 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29268.",
      "Minimum load factor A 2.8 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 1130/5400 kN ratings and 33500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is a 29268 mounted?",
        "a": "Tight shaft washer on the 340 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 2.8 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29268?",
        "a": "A 29268 measures 340 mm bore × 460 mm outside diameter × 73 mm width (13.386 × 18.11 × 2.874 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1130 kN, static C0 5400 kN, fatigue limit Pu 480 kN, reference speed 850 r/min, limiting speed 1,300 r/min, mass about 33500 g. Minimum axial load factor A 2.8 must be maintained in service."
      },
      {
        "q": "How is the 29268 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 68 the 340 mm bore (code 68 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 2.8) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 2.8 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29268",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29268",
      "29268"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29368",
    "brand": "SKF",
    "manufacturer_designation": "29368",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 340,
    "D_mm": 540,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2710,
    "static_load_kN": 11000,
    "fatigue_load_limit_kN": 950,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 105000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29368 for very heavy one-direction axial load: 2710 kN dynamic and 11000 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29368 is the steel cage of the earlier standard design. A minimum axial load of factor A 11 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 105000 g mass and 122 mm axial height sit between 340 and 540 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 11) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 11 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 540 mm washer track.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29368.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 11 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 2710/11000 kN ratings and 105000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 11 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,100 r/min."
      },
      {
        "q": "Which dimensions does the 29368 have?",
        "a": "A 29368 measures 340 mm bore × 540 mm outside diameter × 122 mm width (13.386 × 21.26 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2710 kN, static C0 11000 kN, fatigue limit Pu 950 kN, reference speed 600 r/min, limiting speed 1,100 r/min, mass about 105000 g. Minimum axial load factor A 11 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29368 is the medium 293 series, 340×540×122 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29368?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29368",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29368",
      "29368"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29468-E",
    "brand": "SKF",
    "manufacturer_designation": "29468 E",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 340,
    "D_mm": 620,
    "B_mm": 170,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6700,
    "static_load_kN": 22400,
    "fatigue_load_limit_kN": 1760,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 220000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29468 E is a spherical roller thrust bearing to ISO 104 in the heavy 294 series: asymmetrical barrel rollers running on a sphered housing washer, sized 340×620×170 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. In 29468 E, the 294 series fixes the 620 mm OD and 170 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 68 selects the 340 mm seat. The stamped steel E window cage is matched to size: the E design is the current standard with a stamped window-type steel cage. The sphered housing washer self-aligns during mounting and under shaft deflection. Static safety matters for shock duty: compare peak axial force against C0 22400 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 46) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 46 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 620 mm washer track.",
      "the 560 r/min reference speed is the thermal criterion under load, the 1,000 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29468 E.",
      "The 6700/22400 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 46 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 6700/22400 kN ratings and 220000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 46) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 46 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29468 E also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29468 E mounted?",
        "a": "Tight shaft washer on the 340 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 46 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29468 E?",
        "a": "A 29468 E measures 340 mm bore × 620 mm outside diameter × 170 mm width (13.386 × 24.409 × 6.693 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6700 kN, static C0 22400 kN, fatigue limit Pu 1760 kN, reference speed 560 r/min, limiting speed 1,000 r/min, mass about 220000 g. Minimum axial load factor A 46 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29468",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29468-E",
      "29468 E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29272",
    "brand": "SKF",
    "manufacturer_designation": "29272",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 360,
    "D_mm": 500,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 6800,
    "fatigue_load_limit_kN": 585,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "weight_g": 52000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29272 for very heavy one-direction axial load: 1460 kN dynamic and 6800 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. Reading the code: 292 gives the dimension series (high-speed 292 series) and 72 the 360 mm shaft washer bore (code 72 × 5); the unsuffixed standard execution sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 6800 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 4.4 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 500 mm washer track.",
      "The 1460/6800 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 4.4 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "the 750 r/min reference speed is the thermal criterion under load, the 1,200 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29272.",
      "The 1460/6800 kN ratings and 52000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29272?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      },
      {
        "q": "Where is the 29272 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 4.4 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,200 r/min."
      },
      {
        "q": "Which dimensions does the 29272 have?",
        "a": "A 29272 measures 360 mm bore × 500 mm outside diameter × 85 mm width (14.173 × 19.685 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1460 kN, static C0 6800 kN, fatigue limit Pu 585 kN, reference speed 750 r/min, limiting speed 1,200 r/min, mass about 52000 g. Minimum axial load factor A 4.4 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29272",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29272",
      "29272"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29372",
    "brand": "SKF",
    "manufacturer_designation": "29372",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 360,
    "D_mm": 560,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2760,
    "static_load_kN": 11600,
    "fatigue_load_limit_kN": 980,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 110000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29372 is the classic hook-block and screw-end thrust bearing: 360 mm shaft washer bore, 560 mm OD, minimum axial load factor A 13, and free rotation under load thanks to the spherical geometry. In 29372, the 293 series fixes the 560 mm OD and 122 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 72 selects the 360 mm seat. A minimum axial load of factor A 13 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 110000 g mass and 122 mm axial height sit between 360 and 560 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Large 293 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 13 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 560 mm washer track.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 2760/11600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "the 600 r/min reference speed is the thermal criterion under load, the 1,100 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29372.",
      "The 2760/11600 kN ratings and 110000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 13) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 13 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29372 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29372 mounted?",
        "a": "Tight shaft washer on the 360 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 13 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29372?",
        "a": "A 29372 measures 360 mm bore × 560 mm outside diameter × 122 mm width (14.173 × 22.047 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2760 kN, static C0 11600 kN, fatigue limit Pu 980 kN, reference speed 600 r/min, limiting speed 1,100 r/min, mass about 110000 g. Minimum axial load factor A 13 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29372",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29372",
      "29372"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29472-EM",
    "brand": "SKF",
    "manufacturer_designation": "29472 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 360,
    "D_mm": 640,
    "B_mm": 170,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6200,
    "static_load_kN": 21200,
    "fatigue_load_limit_kN": 1630,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 230000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29472 EM carries 6200 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 360 mm shafts. Reading the code: 294 gives the dimension series (heavy 294 series) and 72 the 360 mm shaft washer bore (code 72 × 5); the EM sets the cage design. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Static safety matters for shock duty: compare peak axial force against C0 21200 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 360 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 6200 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 41 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 640 mm washer track.",
      "The 6200/21200 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 41 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "the 560 r/min reference speed is the thermal criterion under load, the 950 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29472 EM.",
      "The 6200/21200 kN ratings and 230000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 29472 EM have?",
        "a": "A 29472 EM measures 360 mm bore × 640 mm outside diameter × 170 mm width (14.173 × 25.197 × 6.693 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6200 kN, static C0 21200 kN, fatigue limit Pu 1630 kN, reference speed 560 r/min, limiting speed 950 r/min, mass about 230000 g. Minimum axial load factor A 41 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29472 EM is the heavy 294 series, 360×640×170 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29472 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      },
      {
        "q": "Where is the 29472 EM typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29472",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29472-EM",
      "29472 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29276",
    "brand": "SKF",
    "manufacturer_designation": "29276",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 380,
    "D_mm": 520,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1580,
    "static_load_kN": 7650,
    "fatigue_load_limit_kN": 655,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 53000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29276 aligns itself: 380×520×85 mm envelope, 7650 kN static rating, one load direction. Reading the code: 292 gives the dimension series (high-speed 292 series) and 76 the 380 mm shaft washer bore (code 76 × 5); the unsuffixed standard execution sets the cage design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 7650 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 5.6 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 520 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 700 r/min reference speed is the thermal criterion under load, the 1,100 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 5.6 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29276.",
      "The 1580/7650 kN ratings and 53000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 29276 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 5.6 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 1,100 r/min."
      },
      {
        "q": "Which dimensions does the 29276 have?",
        "a": "A 29276 measures 380 mm bore × 520 mm outside diameter × 85 mm width (14.961 × 20.472 × 3.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1580 kN, static C0 7650 kN, fatigue limit Pu 655 kN, reference speed 700 r/min, limiting speed 1,100 r/min, mass about 53000 g. Minimum axial load factor A 5.6 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29276 is the high-speed 292 series, 380×520×85 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29276",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29276",
      "29276"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29376",
    "brand": "SKF",
    "manufacturer_designation": "29376",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 380,
    "D_mm": 600,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3340,
    "static_load_kN": 14000,
    "fatigue_load_limit_kN": 1160,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The medium 293 series bearing 29376 carries 3340 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 380 mm shafts. In 29376, the 293 series fixes the 600 mm OD and 132 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 76 selects the 380 mm seat. A minimum axial load of factor A 19 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 140000 g mass and 132 mm axial height sit between 380 and 600 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Large 293 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 19 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 600 mm washer track.",
      "Minimum load factor A 19 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 530 r/min reference speed is the thermal criterion under load, the 1,000 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29376.",
      "The 3340/14000 kN ratings and 140000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29376 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29376 mounted?",
        "a": "Tight shaft washer on the 380 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 19 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29376?",
        "a": "A 29376 measures 380 mm bore × 600 mm outside diameter × 132 mm width (14.961 × 23.622 × 5.197 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3340 kN, static C0 14000 kN, fatigue limit Pu 1160 kN, reference speed 530 r/min, limiting speed 1,000 r/min, mass about 140000 g. Minimum axial load factor A 19 must be maintained in service."
      },
      {
        "q": "How is the 29376 designation read?",
        "a": "293 is the dimension series (medium 293 series) and 76 the 380 mm bore (code 76 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29376",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29376",
      "29376"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29476-EM",
    "brand": "SKF",
    "manufacturer_designation": "29476 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 380,
    "D_mm": 670,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6800,
    "static_load_kN": 24000,
    "fatigue_load_limit_kN": 1860,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 260000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29476 EM aligns itself: 380×670×175 mm envelope, 24000 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29476 EM is the machined brass EM cage. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. Minimum axial load is explicit at factor A 53: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 53 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 670 mm washer track.",
      "The 6800/24000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 53 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 530 r/min reference speed is the thermal criterion under load, the 900 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 6800/24000 kN ratings and 260000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 926); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 29476 EM have?",
        "a": "A 29476 EM measures 380 mm bore × 670 mm outside diameter × 175 mm width (14.961 × 26.378 × 6.89 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6800 kN, static C0 24000 kN, fatigue limit Pu 1860 kN, reference speed 530 r/min, limiting speed 900 r/min, mass about 260000 g. Minimum axial load factor A 53 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29476 EM is the heavy 294 series, 380×670×175 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29476 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      },
      {
        "q": "Where is the 29476 EM typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29476",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29476-EM",
      "29476 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29280",
    "brand": "SKF",
    "manufacturer_designation": "29280",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1610,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 695,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "weight_g": 55500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The high-speed 292 series bearing 29280 carries 1610 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 400 mm shafts. The designation 29280 separates into 292 (series), 80 (400 mm bore) and no suffix (earlier standard design); washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 8000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 400 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 1610 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 6.1 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 540 mm washer track.",
      "the 700 r/min reference speed is the thermal criterion under load, the 1,100 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29280.",
      "The 1610/8000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 6.1 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 1610/8000 kN ratings and 55500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29280 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 80 the 400 mm bore (code 80 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 6.1) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 6.1 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29280 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29280 mounted?",
        "a": "Tight shaft washer on the 400 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 6.1 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29280",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29280",
      "29280"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29380",
    "brand": "SKF",
    "manufacturer_designation": "29380",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 400,
    "D_mm": 620,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3450,
    "static_load_kN": 14600,
    "fatigue_load_limit_kN": 1200,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 150000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29380 aligns itself: 400×620×132 mm envelope, 14600 kN static rating, one load direction. Reading the code: 293 gives the dimension series (medium 293 series) and 80 the 400 mm shaft washer bore (code 80 × 5); the unsuffixed standard execution sets the cage design. A minimum axial load of factor A 20 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 150000 g mass and 132 mm axial height sit between 400 and 620 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 400 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 3450 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 20 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 620 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 530 r/min reference speed is the thermal criterion under load, the 950 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "The 3450/14600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 20 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 3450/14600 kN ratings and 150000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29380 is the medium 293 series, 400×620×132 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29380?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      },
      {
        "q": "Where is the 29380 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 20 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 950 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29380",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29380",
      "29380"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29480-EM",
    "brand": "SKF",
    "manufacturer_designation": "29480 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 400,
    "D_mm": 710,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 7650,
    "static_load_kN": 26500,
    "fatigue_load_limit_kN": 1960,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 310000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29480 EM for very heavy one-direction axial load: 7650 kN dynamic and 26500 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29480 EM is the machined brass EM cage. A minimum axial load of factor A 62 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 310000 g mass and 185 mm axial height sit between 400 and 710 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 62 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 710 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 480 r/min reference speed is the thermal criterion under load, the 850 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 7650/26500 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 62 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 7650/26500 kN ratings and 310000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29480 EM is the heavy 294 series, 400×710×185 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29480 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      },
      {
        "q": "Where is the 29480 EM typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 62 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 850 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29480",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29480-EM",
      "29480 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29284",
    "brand": "SKF",
    "manufacturer_designation": "29284",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 420,
    "D_mm": 580,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1990,
    "static_load_kN": 9800,
    "fatigue_load_limit_kN": 815,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 75500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29284 is a spherical roller thrust bearing to ISO 104 in the high-speed 292 series: asymmetrical barrel rollers running on a sphered housing washer, sized 420×580×95 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. The designation 29284 separates into 292 (series), 84 (420 mm bore) and no suffix (earlier standard design); washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 9800 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 420 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 1990 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 9.1 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 580 mm washer track.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 1990/9800 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29284.",
      "Minimum load factor A 9.1 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 1990/9800 kN ratings and 75500 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 9.1) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 9.1 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29284 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29284 mounted?",
        "a": "Tight shaft washer on the 420 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 9.1 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29284?",
        "a": "A 29284 measures 420 mm bore × 580 mm outside diameter × 95 mm width (16.535 × 22.835 × 3.74 in). From SKF catalogue PUB BU/P1 17000: dynamic C 1990 kN, static C0 9800 kN, fatigue limit Pu 815 kN, reference speed 630 r/min, limiting speed 1,000 r/min, mass about 75500 g. Minimum axial load factor A 9.1 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29284",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29284",
      "29284"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29384",
    "brand": "SKF",
    "manufacturer_designation": "29384",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 420,
    "D_mm": 650,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3740,
    "static_load_kN": 16000,
    "fatigue_load_limit_kN": 1290,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 170000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 29384 denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the steel cage of the earlier standard design guides the rollers under 140 mm of axial section. Reading the code: 293 gives the dimension series (medium 293 series) and 84 the 420 mm shaft washer bore (code 84 × 5); the unsuffixed standard execution sets the cage design. A minimum axial load of factor A 24 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 170000 g mass and 140 mm axial height sit between 420 and 650 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 420 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 3740 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 24 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 650 mm washer track.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29384.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 24 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 3740/16000 kN ratings and 170000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29384?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      },
      {
        "q": "Where is the 29384 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 24 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 900 r/min."
      },
      {
        "q": "Which dimensions does the 29384 have?",
        "a": "A 29384 measures 420 mm bore × 650 mm outside diameter × 140 mm width (16.535 × 25.591 × 5.512 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3740 kN, static C0 16000 kN, fatigue limit Pu 1290 kN, reference speed 500 r/min, limiting speed 900 r/min, mass about 170000 g. Minimum axial load factor A 24 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29384",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29384",
      "29384"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29484-EM",
    "brand": "SKF",
    "manufacturer_designation": "29484 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 420,
    "D_mm": 730,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 7800,
    "static_load_kN": 27500,
    "fatigue_load_limit_kN": 2080,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 325000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29484 EM aligns itself: 420×730×185 mm envelope, 27500 kN static rating, one load direction. In 29484 EM, the 294 series fixes the 730 mm OD and 185 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 84 selects the 420 mm seat. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Selection arithmetic: C 7800 kN against C0 27500 kN gives a C0/C ratio of 3.53 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 69 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 730 mm washer track.",
      "Minimum load factor A 69 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29484 EM.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 7800/27500 kN ratings and 325000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29484 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 84 the 420 mm bore (code 84 × 5); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 69) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 69 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29484 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29484 EM mounted?",
        "a": "Tight shaft washer on the 420 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 69 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29484",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29484-EM",
      "29484 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29288",
    "brand": "SKF",
    "manufacturer_designation": "29288",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 440,
    "D_mm": 600,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2070,
    "static_load_kN": 10400,
    "fatigue_load_limit_kN": 850,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "weight_g": 78000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29288 is the classic hook-block and screw-end thrust bearing: 440 mm shaft washer bore, 600 mm OD, minimum axial load factor A 10, and free rotation under load thanks to the spherical geometry. The designation 29288 separates into 292 (series), 88 (440 mm bore) and no suffix (earlier standard design); washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 10400 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 440 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 2070 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 10 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 600 mm washer track.",
      "Minimum load factor A 10 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 630 r/min reference speed is the thermal criterion under load, the 1,000 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29288.",
      "The 2070/10400 kN ratings and 78000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29288 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29288 mounted?",
        "a": "Tight shaft washer on the 440 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 10 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29288?",
        "a": "A 29288 measures 440 mm bore × 600 mm outside diameter × 95 mm width (17.323 × 23.622 × 3.74 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2070 kN, static C0 10400 kN, fatigue limit Pu 850 kN, reference speed 630 r/min, limiting speed 1,000 r/min, mass about 78000 g. Minimum axial load factor A 10 must be maintained in service."
      },
      {
        "q": "How is the 29288 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 88 the 440 mm bore (code 88 × 5); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29288",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29288",
      "29288"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29388-EM",
    "brand": "SKF",
    "manufacturer_designation": "29388 EM",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 440,
    "D_mm": 680,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 5200,
    "static_load_kN": 19300,
    "fatigue_load_limit_kN": 1560,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 180000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29388 EM aligns itself: 440×680×145 mm envelope, 19300 kN static rating, one load direction. The designation 29388 EM separates into 293 (series), 88 (440 mm bore) and EM; washers are separable for individual mounting. A minimum axial load of factor A 34 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Selection arithmetic: C 5200 kN against C0 19300 kN gives a C0/C ratio of 3.71 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: fit the shaft washer tight on the 440 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 5200 kN working load.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 34 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 680 mm washer track.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 5200/19300 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 34 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 5200/19300 kN ratings and 180000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 29388 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29388 EM mounted?",
        "a": "Tight shaft washer on the 440 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 34 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29388 EM?",
        "a": "A 29388 EM measures 440 mm bore × 680 mm outside diameter × 145 mm width (17.323 × 26.772 × 5.709 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5200 kN, static C0 19300 kN, fatigue limit Pu 1560 kN, reference speed 530 r/min, limiting speed 850 r/min, mass about 180000 g. Minimum axial load factor A 34 must be maintained in service."
      },
      {
        "q": "How is the 29388 EM designation read?",
        "a": "293 is the dimension series (medium 293 series) and 88 the 440 mm bore (code 88 × 5); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29388",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29388-EM",
      "29388 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29488-EM",
    "brand": "SKF",
    "manufacturer_designation": "29488 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 440,
    "D_mm": 780,
    "B_mm": 206,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9000,
    "static_load_kN": 32000,
    "fatigue_load_limit_kN": 2320,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 410000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29488 EM carries 9000 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 440 mm shafts. The designation 29488 EM separates into 294 (series), 88 (440 mm bore) and EM; washers are separable for individual mounting. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. The 410000 g mass and 206 mm axial height sit between 440 and 780 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 91 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 780 mm washer track.",
      "Minimum load factor A 91 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 430 r/min reference speed is the thermal criterion under load, the 750 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29488 EM.",
      "The 9000/32000 kN ratings and 410000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 29488 EM?",
        "a": "A 29488 EM measures 440 mm bore × 780 mm outside diameter × 206 mm width (17.323 × 30.709 × 8.11 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9000 kN, static C0 32000 kN, fatigue limit Pu 2320 kN, reference speed 430 r/min, limiting speed 750 r/min, mass about 410000 g. Minimum axial load factor A 91 must be maintained in service."
      },
      {
        "q": "How is the 29488 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 88 the 440 mm bore (code 88 × 5); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 91) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 91 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29488 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29488",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29488-EM",
      "29488 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29292",
    "brand": "SKF",
    "manufacturer_designation": "29292",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 460,
    "D_mm": 620,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2070,
    "static_load_kN": 10600,
    "fatigue_load_limit_kN": 865,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "weight_g": 81000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 29292 for very heavy one-direction axial load: 2070 kN dynamic and 10600 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29292 is the steel cage of the earlier standard design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 10600 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 11) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 11 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 620 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 600 r/min reference speed is the thermal criterion under load, the 950 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 11 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29292.",
      "The 2070/10600 kN ratings and 81000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29292 is the high-speed 292 series, 460×620×95 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29292?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      },
      {
        "q": "Where is the 29292 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 11 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 950 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29292",
      "29292"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29392",
    "brand": "SKF",
    "manufacturer_designation": "29392",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 460,
    "D_mm": 710,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4310,
    "static_load_kN": 19000,
    "fatigue_load_limit_kN": 1500,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 215000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29392 is the classic hook-block and screw-end thrust bearing: 460 mm shaft washer bore, 710 mm OD, minimum axial load factor A 34, and free rotation under load thanks to the spherical geometry. Reading the code: 293 gives the dimension series (medium 293 series) and 92 the 460 mm shaft washer bore (code 92 × 5); the unsuffixed standard execution sets the cage design. A minimum axial load of factor A 34 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Minimum axial load is explicit at factor A 34: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 34) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 34 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 710 mm washer track.",
      "The 4310/19000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 34 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 450 r/min reference speed is the thermal criterion under load, the 800 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "The 4310/19000 kN ratings and 215000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 29392 is the medium 293 series, 460×710×150 mm."
      },
      {
        "q": "What do E, EM and EF mean on 29392?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      },
      {
        "q": "Where is the 29392 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 34 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 800 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29392",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29392",
      "29392"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29492-EM",
    "brand": "SKF",
    "manufacturer_designation": "29492 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 460,
    "D_mm": 800,
    "B_mm": 206,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9300,
    "static_load_kN": 33500,
    "fatigue_load_limit_kN": 2450,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 425000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "29492 EM is the classic hook-block and screw-end thrust bearing: 460 mm shaft washer bore, 800 mm OD, minimum axial load factor A 100, and free rotation under load thanks to the spherical geometry. The designation 29492 EM separates into 294 (series), 92 (460 mm bore) and EM; washers are separable for individual mounting. A minimum axial load of factor A 100 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. One direction only: 29492 EM cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Verify the minimum axial load (factor A 100) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 100 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 800 mm washer track.",
      "the 430 r/min reference speed is the thermal criterion under load, the 750 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29492 EM.",
      "Minimum load factor A 100 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 9300/33500 kN ratings and 425000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 100) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 100 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29492 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29492 EM mounted?",
        "a": "Tight shaft washer on the 460 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 100 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 29492 EM?",
        "a": "A 29492 EM measures 460 mm bore × 800 mm outside diameter × 206 mm width (18.11 × 31.496 × 8.11 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9300 kN, static C0 33500 kN, fatigue limit Pu 2450 kN, reference speed 430 r/min, limiting speed 750 r/min, mass about 425000 g. Minimum axial load factor A 100 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29492",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29492-EM",
      "29492 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29296",
    "brand": "SKF",
    "manufacturer_designation": "29296",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 480,
    "D_mm": 650,
    "B_mm": 103,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2350,
    "static_load_kN": 11800,
    "fatigue_load_limit_kN": 950,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 98000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 29296 aligns itself: 480×650×103 mm envelope, 11800 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 29296 is the steel cage of the earlier standard design. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Static safety matters for shock duty: compare peak axial force against C0 11800 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 13) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 13 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 650 mm washer track.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29296.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 2350/11800 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 13 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 2350/11800 kN ratings and 98000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 29296?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      },
      {
        "q": "Where is the 29296 typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 13 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 900 r/min."
      },
      {
        "q": "Which dimensions does the 29296 have?",
        "a": "A 29296 measures 480 mm bore × 650 mm outside diameter × 103 mm width (18.898 × 25.591 × 4.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2350 kN, static C0 11800 kN, fatigue limit Pu 950 kN, reference speed 560 r/min, limiting speed 900 r/min, mass about 98000 g. Minimum axial load factor A 13 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29296",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29296",
      "29296"
    ],
    "locale_variants": {}
  },
  {
    "sku": "29496-EM",
    "brand": "SKF",
    "manufacturer_designation": "29496 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 480,
    "D_mm": 850,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9550,
    "static_load_kN": 39000,
    "fatigue_load_limit_kN": 2800,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "weight_g": 550000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 29496 EM carries 9550 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 480 mm shafts. In 29496 EM, the 294 series fixes the 850 mm OD and 224 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 96 selects the 480 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Minimum axial load is explicit at factor A 140: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 140 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 850 mm washer track.",
      "the 340 r/min reference speed is the thermal criterion under load, the 670 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 29496 EM.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 140 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 9550/39000 kN ratings and 550000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 29496 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 96 the 480 mm bore (code 96 × 5); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 140) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 140 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 29496 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 29496 EM mounted?",
        "a": "Tight shaft washer on the 480 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 140 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "29496",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "29496-EM",
      "29496 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "292-500",
    "brand": "SKF",
    "manufacturer_designation": "292/500",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 500,
    "D_mm": 670,
    "B_mm": 103,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2390,
    "static_load_kN": 12500,
    "fatigue_load_limit_kN": 1000,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "weight_g": 100000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 292/500 for very heavy one-direction axial load: 2390 kN dynamic and 12500 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. The designation 292/500 separates into 292 (series), 500 mm (slash-size) (500 mm bore — bore 500 mm is written directly after the slash) and no suffix (earlier standard design); washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Speed planning separates the 560 r/min thermal reference from the 900 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 15 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 670 mm washer track.",
      "the 560 r/min reference speed is the thermal criterion under load, the 900 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 292/500.",
      "Minimum load factor A 15 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 2390/12500 kN ratings and 100000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 292/500 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 292/500 mounted?",
        "a": "Tight shaft washer on the 500 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 15 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 292/500?",
        "a": "A 292/500 measures 500 mm bore × 670 mm outside diameter × 103 mm width (19.685 × 26.378 × 4.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2390 kN, static C0 12500 kN, fatigue limit Pu 1000 kN, reference speed 560 r/min, limiting speed 900 r/min, mass about 100000 g. Minimum axial load factor A 15 must be maintained in service."
      },
      {
        "q": "How is the 292/500 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 500 mm (slash-size) the 500 mm bore (the bore is written directly after the slash (no bore code)); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "292-500",
      "292/500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "293-500",
    "brand": "SKF",
    "manufacturer_designation": "293/500",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 500,
    "D_mm": 750,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4490,
    "static_load_kN": 20400,
    "fatigue_load_limit_kN": 1560,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 235000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 293/500 aligns itself: 500×750×150 mm envelope, 20400 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 293/500 is the steel cage of the earlier standard design. The medium 293 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. One direction only: 293/500 cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Verify the minimum axial load (factor A 40) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 40 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 750 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 430 r/min reference speed is the thermal criterion under load, the 800 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 40 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 293/500.",
      "The 4490/20400 kN ratings and 235000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 40 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 800 r/min."
      },
      {
        "q": "Which dimensions does the 293/500 have?",
        "a": "A 293/500 measures 500 mm bore × 750 mm outside diameter × 150 mm width (19.685 × 29.528 × 5.906 in). From SKF catalogue PUB BU/P1 17000: dynamic C 4490 kN, static C0 20400 kN, fatigue limit Pu 1560 kN, reference speed 430 r/min, limiting speed 800 r/min, mass about 235000 g. Minimum axial load factor A 40 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 293/500 is the medium 293 series, 500×750×150 mm."
      },
      {
        "q": "What do E, EM and EF mean on 293/500?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the steel cage of the earlier standard design."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "293",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "293-500",
      "293/500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-500-EM",
    "brand": "SKF",
    "manufacturer_designation": "294/500 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 500,
    "D_mm": 870,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9370,
    "static_load_kN": 40000,
    "fatigue_load_limit_kN": 2850,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "weight_g": 560000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 294/500 EM carries 9370 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 500 mm shafts. The designation 294/500 EM separates into 294 (series), 500 mm (slash-size) (500 mm bore — bore 500 mm is written directly after the slash) and EM; washers are separable for individual mounting. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. Minimum axial load is explicit at factor A 150: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Verify the minimum axial load (factor A 150) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 150 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 870 mm washer track.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 9370/40000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 340 r/min reference speed is the thermal criterion under load, the 670 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 9370/40000 kN ratings and 560000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 294/500 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 500 mm (slash-size) the 500 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 150) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 150 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 294/500 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 294/500 EM mounted?",
        "a": "Tight shaft washer on the 500 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 150 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-500-EM",
      "294/500 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "292-530-EM",
    "brand": "SKF",
    "manufacturer_designation": "292/530 EM",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 530,
    "D_mm": 710,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3110,
    "static_load_kN": 15300,
    "fatigue_load_limit_kN": 1220,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "weight_g": 115000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 292/530 EM for very heavy one-direction axial load: 3110 kN dynamic and 15300 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. Reading the code: 292 gives the dimension series (high-speed 292 series) and 530 mm (slash-size) the 530 mm shaft washer bore (the bore is written directly after the slash (no bore code)); the EM sets the cage design. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. Static safety matters for shock duty: compare peak axial force against C0 15300 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 22) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 22 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 710 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 530 r/min reference speed is the thermal criterion under load, the 850 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 22 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 292/530 EM.",
      "The 3110/15300 kN ratings and 115000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 22 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 850 r/min."
      },
      {
        "q": "Which dimensions does the 292/530 EM have?",
        "a": "A 292/530 EM measures 530 mm bore × 710 mm outside diameter × 109 mm width (20.866 × 27.953 × 4.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3110 kN, static C0 15300 kN, fatigue limit Pu 1220 kN, reference speed 530 r/min, limiting speed 850 r/min, mass about 115000 g. Minimum axial load factor A 22 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 292/530 EM is the high-speed 292 series, 530×710×109 mm."
      },
      {
        "q": "What do E, EM and EF mean on 292/530 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "292-530-EM",
      "292/530 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "293-530-EM",
    "brand": "SKF",
    "manufacturer_designation": "293/530 EM",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 530,
    "D_mm": 800,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 5870,
    "static_load_kN": 26500,
    "fatigue_load_limit_kN": 2080,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "weight_g": 265000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The medium 293 series bearing 293/530 EM carries 5870 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 530 mm shafts. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 293/530 EM is the machined brass EM cage. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. The 265000 g mass and 160 mm axial height sit between 530 and 800 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 530 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 5870 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 67 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 800 mm washer track.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 400 r/min reference speed is the thermal criterion under load, the 750 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "The 5870/26500 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 67 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The 5870/26500 kN ratings and 265000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 67 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 750 r/min."
      },
      {
        "q": "Which dimensions does the 293/530 EM have?",
        "a": "A 293/530 EM measures 530 mm bore × 800 mm outside diameter × 160 mm width (20.866 × 31.496 × 6.299 in). From SKF catalogue PUB BU/P1 17000: dynamic C 5870 kN, static C0 26500 kN, fatigue limit Pu 2080 kN, reference speed 400 r/min, limiting speed 750 r/min, mass about 265000 g. Minimum axial load factor A 67 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 293/530 EM is the medium 293 series, 530×800×160 mm."
      },
      {
        "q": "What do E, EM and EF mean on 293/530 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "293",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "293-530-EM",
      "293/530 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-530-EM",
    "brand": "SKF",
    "manufacturer_designation": "294/530 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 530,
    "D_mm": 920,
    "B_mm": 236,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 10500,
    "static_load_kN": 44000,
    "fatigue_load_limit_kN": 3100,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 630,
    "max_rpm": 630,
    "weight_g": 650000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "The heavy 294 series bearing 294/530 EM carries 10500 kN of thrust on barrel rollers whose contact angle also tolerates radial force up to a fraction of the applied thrust — the standard heavy-duty thrust bearing for 530 mm shafts. In 294/530 EM, the 294 series fixes the 920 mm OD and 236 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 530 mm (slash-size) selects the 530 mm seat. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Speed planning separates the 320 r/min thermal reference from the 630 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Verify the minimum axial load (factor A 180) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 180 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 920 mm washer track.",
      "Minimum load factor A 180 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 10500/44000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 10500/44000 kN ratings and 650000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is a 294/530 EM mounted?",
        "a": "Tight shaft washer on the 530 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 180 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 294/530 EM?",
        "a": "A 294/530 EM measures 530 mm bore × 920 mm outside diameter × 236 mm width (20.866 × 36.22 × 9.291 in). From SKF catalogue PUB BU/P1 17000: dynamic C 10500 kN, static C0 44000 kN, fatigue limit Pu 3100 kN, reference speed 320 r/min, limiting speed 630 r/min, mass about 650000 g. Minimum axial load factor A 180 must be maintained in service."
      },
      {
        "q": "How is the 294/530 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 530 mm (slash-size) the 530 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 180) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 180 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-530-EM",
      "294/530 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "292-560",
    "brand": "SKF",
    "manufacturer_designation": "292/560",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 560,
    "D_mm": 750,
    "B_mm": 115,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2990,
    "static_load_kN": 16000,
    "fatigue_load_limit_kN": 1220,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "weight_g": 140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 292/560 for very heavy one-direction axial load: 2990 kN dynamic and 16000 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. In 292/560, the 292 series fixes the 750 mm OD and 115 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 560 mm (slash-size) selects the 560 mm seat. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Speed planning separates the 480 r/min thermal reference from the 800 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the steel cage of the earlier standard design, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 24 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 750 mm washer track.",
      "the 480 r/min reference speed is the thermal criterion under load, the 800 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 292/560.",
      "Minimum load factor A 24 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 2990/16000 kN ratings and 140000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 292/560?",
        "a": "A 292/560 measures 560 mm bore × 750 mm outside diameter × 115 mm width (22.047 × 29.528 × 4.528 in). From SKF catalogue PUB BU/P1 17000: dynamic C 2990 kN, static C0 16000 kN, fatigue limit Pu 1220 kN, reference speed 480 r/min, limiting speed 800 r/min, mass about 140000 g. Minimum axial load factor A 24 must be maintained in service."
      },
      {
        "q": "How is the 292/560 designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 560 mm (slash-size) the 560 mm bore (the bore is written directly after the slash (no bore code)); no suffix is the cage execution (steel cage of the earlier standard design). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 24) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 24 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 292/560 also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "292-560",
      "292/560"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-560-EM",
    "brand": "SKF",
    "manufacturer_designation": "294/560 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 560,
    "D_mm": 980,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 12000,
    "static_load_kN": 51000,
    "fatigue_load_limit_kN": 3550,
    "reference_speed_rpm": 300,
    "limiting_speed_rpm": 560,
    "max_rpm": 560,
    "weight_g": 810000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 294/560 EM denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the machined brass EM cage guides the rollers under 250 mm of axial section. The designation 294/560 EM separates into 294 (series), 560 mm (slash-size) (560 mm bore — bore 560 mm is written directly after the slash) and EM; washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. One direction only: 294/560 EM cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 560 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 12000 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 250 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 980 mm washer track.",
      "the 300 r/min reference speed is the thermal criterion under load, the 560 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/560 EM.",
      "Minimum load factor A 250 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 12000/51000 kN ratings and 810000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 294/560 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 560 mm (slash-size) the 560 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 250) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 250 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 294/560 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 294/560 EM mounted?",
        "a": "Tight shaft washer on the 560 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 250 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-560-EM",
      "294/560 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "292-600-EM",
    "brand": "SKF",
    "manufacturer_designation": "292/600 EM",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 600,
    "D_mm": 800,
    "B_mm": 122,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3740,
    "static_load_kN": 18600,
    "fatigue_load_limit_kN": 1460,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "weight_g": 170000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "292/600 EM is the classic hook-block and screw-end thrust bearing: 600 mm shaft washer bore, 800 mm OD, minimum axial load factor A 33, and free rotation under load thanks to the spherical geometry. In 292/600 EM, the 292 series fixes the 800 mm OD and 122 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 600 mm (slash-size) selects the 600 mm seat. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. Static safety matters for shock duty: compare peak axial force against C0 18600 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Large 292 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 33 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 800 mm washer track.",
      "the 450 r/min reference speed is the thermal criterion under load, the 700 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 292/600 EM.",
      "The 3740/18600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 33 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "The 3740/18600 kN ratings and 170000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is a 292/600 EM mounted?",
        "a": "Tight shaft washer on the 600 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 33 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 292/600 EM?",
        "a": "A 292/600 EM measures 600 mm bore × 800 mm outside diameter × 122 mm width (23.622 × 31.496 × 4.803 in). From SKF catalogue PUB BU/P1 17000: dynamic C 3740 kN, static C0 18600 kN, fatigue limit Pu 1460 kN, reference speed 450 r/min, limiting speed 700 r/min, mass about 170000 g. Minimum axial load factor A 33 must be maintained in service."
      },
      {
        "q": "How is the 292/600 EM designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 600 mm (slash-size) the 600 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 33) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 33 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "292-600-EM",
      "292/600 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-600-EM",
    "brand": "SKF",
    "manufacturer_designation": "294/600 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 600,
    "D_mm": 1030,
    "B_mm": 258,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 13100,
    "static_load_kN": 56000,
    "fatigue_load_limit_kN": 4000,
    "reference_speed_rpm": 280,
    "limiting_speed_rpm": 530,
    "max_rpm": 530,
    "weight_g": 845000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 294/600 EM aligns itself: 600×1030×258 mm envelope, 56000 kN static rating, one load direction. The designation 294/600 EM separates into 294 (series), 600 mm (slash-size) (600 mm bore — bore 600 mm is written directly after the slash) and EM; washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. One direction only: 294/600 EM cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 600 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 13100 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "Above 300 mm bore the minimum load is large (A 300 here): design the preload or lift sequence explicitly — an unloaded slow rotation glazes the 1030 mm washer track.",
      "Minimum load factor A 300 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 280 r/min reference speed is the thermal criterion under load, the 530 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/600 EM.",
      "The 13100/56000 kN ratings and 845000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 294/600 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 294/600 EM mounted?",
        "a": "Tight shaft washer on the 600 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 300 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 294/600 EM?",
        "a": "A 294/600 EM measures 600 mm bore × 1030 mm outside diameter × 258 mm width (23.622 × 40.551 × 10.157 in). From SKF catalogue PUB BU/P1 17000: dynamic C 13100 kN, static C0 56000 kN, fatigue limit Pu 4000 kN, reference speed 280 r/min, limiting speed 530 r/min, mass about 845000 g. Minimum axial load factor A 300 must be maintained in service."
      },
      {
        "q": "How is the 294/600 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 600 mm (slash-size) the 600 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-600-EM",
      "294/600 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "292-630-EM",
    "brand": "SKF",
    "manufacturer_designation": "292/630 EM",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 630,
    "D_mm": 850,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 4770,
    "static_load_kN": 23600,
    "fatigue_load_limit_kN": 1800,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "weight_g": 210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "292/630 EM is the classic hook-block and screw-end thrust bearing: 630 mm shaft washer bore, 850 mm OD, minimum axial load factor A 53, and free rotation under load thanks to the spherical geometry. The designation 292/630 EM separates into 292 (series), 630 mm (slash-size) (630 mm bore — bore 630 mm is written directly after the slash) and EM; washers are separable for individual mounting. The contact geometry also accepts simultaneous radial load up to roughly 55 % of the simultaneous axial force; beyond that mix, add a separate radial bearing to the arrangement. Minimum axial load is explicit at factor A 53: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Mounting: fit the shaft washer tight on the 630 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 4770 kN working load.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 630 mm bore and 210 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 4770/23600 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 400 r/min reference speed is the thermal criterion under load, the 670 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "The 4770/23600 kN ratings and 210000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 292/630 EM designation read?",
        "a": "292 is the dimension series (high-speed 292 series) and 630 mm (slash-size) the 630 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 53) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 53 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 292/630 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 292/630 EM mounted?",
        "a": "Tight shaft washer on the 630 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 53 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "292-630-EM",
      "292/630 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "293-630-EM",
    "brand": "SKF",
    "manufacturer_designation": "293/630 EM",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 630,
    "D_mm": 950,
    "B_mm": 190,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 8450,
    "static_load_kN": 38000,
    "fatigue_load_limit_kN": 2900,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 600,
    "max_rpm": 600,
    "weight_g": 485000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 293/630 EM aligns itself: 630×950×190 mm envelope, 38000 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 293/630 EM is the machined brass EM cage. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. Selection arithmetic: C 8450 kN against C0 38000 kN gives a C0/C ratio of 4.50 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Large 293 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the machined brass EM cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 630 mm bore and 485 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 293/630 EM.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 140 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 8450/38000 kN ratings and 485000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 293/630 EM is the medium 293 series, 630×950×190 mm."
      },
      {
        "q": "What do E, EM and EF mean on 293/630 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      },
      {
        "q": "Where is the 293/630 EM typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 140 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 600 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "293",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "293-630-EM",
      "293/630 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-630-EM",
    "brand": "SKF",
    "manufacturer_designation": "294/630 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 630,
    "D_mm": 1090,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 14400,
    "static_load_kN": 62000,
    "fatigue_load_limit_kN": 4150,
    "reference_speed_rpm": 260,
    "limiting_speed_rpm": 500,
    "max_rpm": 500,
    "weight_g": 1040000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 294/630 EM aligns itself: 630×1090×280 mm envelope, 62000 kN static rating, one load direction. In 294/630 EM, the 294 series fixes the 1090 mm OD and 280 mm height — 294 is the heaviest section per bore, 292 the lightest and fastest — and 630 mm (slash-size) selects the 630 mm seat. A minimum axial load of factor A 370 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Static safety matters for shock duty: compare peak axial force against C0 62000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Mounting: fit the shaft washer tight on the 630 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 14400 kN working load.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 630 mm bore and 1040 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "the 260 r/min reference speed is the thermal criterion under load, the 500 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/630 EM.",
      "The 14400/62000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 370 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 14400/62000 kN ratings and 1040000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 294/630 EM designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 630 mm (slash-size) the 630 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 370) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 370 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 294/630 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 294/630 EM mounted?",
        "a": "Tight shaft washer on the 630 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 370 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-630-EM",
      "294/630 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-670-EM",
    "brand": "SKF",
    "manufacturer_designation": "294/670 EM",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 670,
    "D_mm": 1150,
    "B_mm": 290,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 15400,
    "static_load_kN": 68000,
    "fatigue_load_limit_kN": 4500,
    "reference_speed_rpm": 240,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "weight_g": 1210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "294/670 EM is the classic hook-block and screw-end thrust bearing: 670 mm shaft washer bore, 1150 mm OD, minimum axial load factor A 440, and free rotation under load thanks to the spherical geometry. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 294/670 EM is the machined brass EM cage. A minimum axial load of factor A 440 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Selection arithmetic: C 15400 kN against C0 68000 kN gives a C0/C ratio of 4.42 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Verify the minimum axial load (factor A 440) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 670 mm bore and 1210 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/670 EM.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 440 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 15400/68000 kN ratings and 1210000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 440 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 450 r/min."
      },
      {
        "q": "Which dimensions does the 294/670 EM have?",
        "a": "A 294/670 EM measures 670 mm bore × 1150 mm outside diameter × 290 mm width (26.378 × 45.276 × 11.417 in). From SKF catalogue PUB BU/P1 17000: dynamic C 15400 kN, static C0 68000 kN, fatigue limit Pu 4500 kN, reference speed 240 r/min, limiting speed 450 r/min, mass about 1210000 g. Minimum axial load factor A 440 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 294/670 EM is the heavy 294 series, 670×1150×290 mm."
      },
      {
        "q": "What do E, EM and EF mean on 294/670 EM?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the machined brass EM cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-670-EM",
      "294/670 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "293-710-EM",
    "brand": "SKF",
    "manufacturer_designation": "293/710 EM",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 710,
    "D_mm": 1060,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 9950,
    "static_load_kN": 45500,
    "fatigue_load_limit_kN": 3400,
    "reference_speed_rpm": 280,
    "limiting_speed_rpm": 500,
    "max_rpm": 500,
    "weight_g": 610000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 293/710 EM aligns itself: 710×1060×212 mm envelope, 45500 kN static rating, one load direction. The designation 293/710 EM separates into 293 (series), 710 mm (slash-size) (710 mm bore — bore 710 mm is written directly after the slash) and EM; washers are separable for individual mounting. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. The 610000 g mass and 212 mm axial height sit between 710 and 1060 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 200) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "condensation pitting in machines that run intermittently in humid environments",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 710 mm bore and 610 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "the 280 r/min reference speed is the thermal criterion under load, the 500 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 293/710 EM.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 9950/45500 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 9950/45500 kN ratings and 610000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Why is the minimum axial load (A 200) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 200 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 293/710 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 293/710 EM mounted?",
        "a": "Tight shaft washer on the 710 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 200 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 293/710 EM?",
        "a": "A 293/710 EM measures 710 mm bore × 1060 mm outside diameter × 212 mm width (27.953 × 41.732 × 8.346 in). From SKF catalogue PUB BU/P1 17000: dynamic C 9950 kN, static C0 45500 kN, fatigue limit Pu 3400 kN, reference speed 280 r/min, limiting speed 500 r/min, mass about 610000 g. Minimum axial load factor A 200 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "293",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "293-710-EM",
      "293/710 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-710-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/710 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 710,
    "D_mm": 1220,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17600,
    "static_load_kN": 76500,
    "fatigue_load_limit_kN": 5000,
    "reference_speed_rpm": 220,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "weight_g": 1500000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "Where a cylindrical roller thrust bearing would edge-load under deflection, 294/710 EF aligns itself: 710×1220×308 mm envelope, 76500 kN static rating, one load direction. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 294/710 EF is the extra-large steel EF cage. A minimum axial load of factor A 560 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Speed planning separates the 220 r/min thermal reference from the 430 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Verify the minimum axial load (factor A 560) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 710 mm bore and 1500 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/710 EF.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 220 r/min reference speed is the thermal criterion under load, the 430 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "The 17600/76500 kN ratings and 1500000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 294/710 EF typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 560 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 430 r/min."
      },
      {
        "q": "Which dimensions does the 294/710 EF have?",
        "a": "A 294/710 EF measures 710 mm bore × 1220 mm outside diameter × 308 mm width (27.953 × 48.031 × 12.126 in). From SKF catalogue PUB BU/P1 17000: dynamic C 17600 kN, static C0 76500 kN, fatigue limit Pu 5000 kN, reference speed 220 r/min, limiting speed 430 r/min, mass about 1500000 g. Minimum axial load factor A 560 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 294/710 EF is the heavy 294 series, 710×1220×308 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-710-EF",
      "294/710 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-750-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/750 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 750,
    "D_mm": 1280,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 18700,
    "static_load_kN": 85000,
    "fatigue_load_limit_kN": 5500,
    "reference_speed_rpm": 200,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "weight_g": 1650000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 294/750 EF denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the extra-large steel EF cage guides the rollers under 315 mm of axial section. Reading the code: 294 gives the dimension series (heavy 294 series) and 750 mm (slash-size) the 750 mm shaft washer bore (the bore is written directly after the slash (no bore code)); the EF sets the cage design. A minimum axial load of factor A 690 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 1650000 g mass and 315 mm axial height sit between 750 and 1280 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Mounting: fit the shaft washer tight on the 750 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 18700 kN working load.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 750 mm bore and 1650 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/750 EF.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "Minimum load factor A 690 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 18700/85000 kN ratings and 1650000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 928); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 294/750 EF?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the extra-large steel EF cage."
      },
      {
        "q": "Where is the 294/750 EF typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 690 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 400 r/min."
      },
      {
        "q": "Which dimensions does the 294/750 EF have?",
        "a": "A 294/750 EF measures 750 mm bore × 1280 mm outside diameter × 315 mm width (29.528 × 50.394 × 12.402 in). From SKF catalogue PUB BU/P1 17000: dynamic C 18700 kN, static C0 85000 kN, fatigue limit Pu 5500 kN, reference speed 200 r/min, limiting speed 400 r/min, mass about 1650000 g. Minimum axial load factor A 690 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-750-EF",
      "294/750 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "292-800-EM",
    "brand": "SKF",
    "manufacturer_designation": "292/800 EM",
    "series": "29200-series",
    "type": "spherical_roller_thrust",
    "d_mm": 800,
    "D_mm": 1060,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 6560,
    "static_load_kN": 34500,
    "fatigue_load_limit_kN": 2550,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 530,
    "max_rpm": 530,
    "weight_g": 380000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "292/800 EM is the classic hook-block and screw-end thrust bearing: 800 mm shaft washer bore, 1060 mm OD, minimum axial load factor A 110, and free rotation under load thanks to the spherical geometry. Reading the code: 292 gives the dimension series (high-speed 292 series) and 800 mm (slash-size) the 800 mm shaft washer bore (the bore is written directly after the slash (no bore code)); the EM sets the cage design. The machined brass EM cage is matched to size: brass cages tolerate the heaviest, slowest loads and marginal film conditions. The sphered housing washer self-aligns during mounting and under shaft deflection. One direction only: 292/800 EM cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Mounting: fit the shaft washer tight on the 800 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 6560 kN working load.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "rolling-contact fatigue spalling after the catalogue L10 life is exhausted",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 800 mm bore and 380 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 320 r/min reference speed is the thermal criterion under load, the 530 r/min limiting speed is the mechanical ceiling; large 292 bearings are normally run well below it with oil cooling.",
      "Minimum load factor A 110 dominates commissioning: start the oil flow and preload before rotation, especially on 292 bearings where an unloaded cold start smears the rollers.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 292/800 EM.",
      "The 6560/34500 kN ratings and 380000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Where is the 292/800 EM typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 110 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 530 r/min."
      },
      {
        "q": "Which dimensions does the 292/800 EM have?",
        "a": "A 292/800 EM measures 800 mm bore × 1060 mm outside diameter × 155 mm width (31.496 × 41.732 × 6.102 in). From SKF catalogue PUB BU/P1 17000: dynamic C 6560 kN, static C0 34500 kN, fatigue limit Pu 2550 kN, reference speed 320 r/min, limiting speed 530 r/min, mass about 380000 g. Minimum axial load factor A 110 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 292/800 EM is the high-speed 292 series, 800×1060×155 mm."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "292",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "292-800-EM",
      "292/800 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "293-800-EM",
    "brand": "SKF",
    "manufacturer_designation": "293/800 EM",
    "series": "29300-series",
    "type": "spherical_roller_thrust",
    "d_mm": 800,
    "D_mm": 1180,
    "B_mm": 230,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 11300,
    "static_load_kN": 55000,
    "fatigue_load_limit_kN": 3900,
    "reference_speed_rpm": 240,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "weight_g": 810000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "293/800 EM is the classic hook-block and screw-end thrust bearing: 800 mm shaft washer bore, 1180 mm OD, minimum axial load factor A 290, and free rotation under load thanks to the spherical geometry. The designation 293/800 EM separates into 293 (series), 800 mm (slash-size) (800 mm bore — bore 800 mm is written directly after the slash) and EM; washers are separable for individual mounting. A minimum axial load of factor A 290 must be maintained — in the large 293 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. The 810000 g mass and 230 mm axial height sit between 800 and 1180 mm washer diameters; check the seat shoulder spans the full ring face — a narrow shoulder causes washer fretting long before fatigue does. Verify the minimum axial load (factor A 290) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "shaft-washer creep and fretting corrosion on a soft or undersized shaft shoulder",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "condensation pitting in machines that run intermittently in humid environments",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 800 mm bore and 810 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Minimum load factor A 290 dominates commissioning: start the oil flow and preload before rotation, especially on 293 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 240 r/min reference speed is the thermal criterion under load, the 450 r/min limiting speed is the mechanical ceiling; large 293 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 293/800 EM.",
      "The 11300/55000 kN ratings and 810000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Can the 293/800 EM also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 293/800 EM mounted?",
        "a": "Tight shaft washer on the 800 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 290 preload verified at commissioning."
      },
      {
        "q": "What are the dimensions and ratings of the 293/800 EM?",
        "a": "A 293/800 EM measures 800 mm bore × 1180 mm outside diameter × 230 mm width (31.496 × 46.457 × 9.055 in). From SKF catalogue PUB BU/P1 17000: dynamic C 11300 kN, static C0 55000 kN, fatigue limit Pu 3900 kN, reference speed 240 r/min, limiting speed 450 r/min, mass about 810000 g. Minimum axial load factor A 290 must be maintained in service."
      },
      {
        "q": "How is the 293/800 EM designation read?",
        "a": "293 is the dimension series (medium 293 series) and 800 mm (slash-size) the 800 mm bore (the bore is written directly after the slash (no bore code)); EM is the cage execution (machined brass EM cage). The sphered housing washer provides self-alignment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "293",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "293-800-EM",
      "293/800 EM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-800-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/800 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 800,
    "D_mm": 1360,
    "B_mm": 335,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 20200,
    "static_load_kN": 93000,
    "fatigue_load_limit_kN": 5850,
    "reference_speed_rpm": 190,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "weight_g": 2030000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "294/800 EF is the classic hook-block and screw-end thrust bearing: 800 mm shaft washer bore, 1360 mm OD, minimum axial load factor A 820, and free rotation under load thanks to the spherical geometry. The designation 294/800 EF separates into 294 (series), 800 mm (slash-size) (800 mm bore — bore 800 mm is written directly after the slash) and EF; washers are separable for individual mounting. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Speed planning separates the 190 r/min thermal reference from the 360 r/min mechanical limiting speed. Thrust bearings govern the thermal speed of many vertical arrangements, and oil circulation raises the usable speed substantially above grease values. Mounting: fit the shaft washer tight on the 800 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 20200 kN working load.",
    "applications": [
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 800 mm bore and 2030 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Minimum load factor A 820 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 20200/93000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 20200/93000 kN ratings and 2030000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What are the dimensions and ratings of the 294/800 EF?",
        "a": "A 294/800 EF measures 800 mm bore × 1360 mm outside diameter × 335 mm width (31.496 × 53.543 × 13.189 in). From SKF catalogue PUB BU/P1 17000: dynamic C 20200 kN, static C0 93000 kN, fatigue limit Pu 5850 kN, reference speed 190 r/min, limiting speed 360 r/min, mass about 2030000 g. Minimum axial load factor A 820 must be maintained in service."
      },
      {
        "q": "How is the 294/800 EF designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 800 mm (slash-size) the 800 mm bore (the bore is written directly after the slash (no bore code)); EF is the cage execution (extra-large steel EF cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 820) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 820 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 294/800 EF also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-800-EF",
      "294/800 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-850-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/850 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 850,
    "D_mm": 1440,
    "B_mm": 354,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 23900,
    "static_load_kN": 108000,
    "fatigue_load_limit_kN": 7100,
    "reference_speed_rpm": 170,
    "limiting_speed_rpm": 340,
    "max_rpm": 340,
    "weight_g": 2390000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "294/850 EF is a spherical roller thrust bearing to ISO 104 in the heavy 294 series: asymmetrical barrel rollers running on a sphered housing washer, sized 850×1440×354 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. Reading the code: 294 gives the dimension series (heavy 294 series) and 850 mm (slash-size) the 850 mm shaft washer bore (the bore is written directly after the slash (no bore code)); the EF sets the cage design. The heavy 294 series is typically oil-bath or forced-oil lubricated in the large sizes: the pumping action of the barrel rollers drives oil through the contact, and interrupted oil supply damages the bearing fastest. Selection arithmetic: C 23900 kN against C0 108000 kN gives a C0/C ratio of 4.52 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the extra-large steel EF cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 850 mm bore and 2390 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "The 23900/108000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1100 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 23900/108000 kN ratings and 2390000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1100 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 340 r/min."
      },
      {
        "q": "Which dimensions does the 294/850 EF have?",
        "a": "A 294/850 EF measures 850 mm bore × 1440 mm outside diameter × 354 mm width (33.465 × 56.693 × 13.937 in). From SKF catalogue PUB BU/P1 17000: dynamic C 23900 kN, static C0 108000 kN, fatigue limit Pu 7100 kN, reference speed 170 r/min, limiting speed 340 r/min, mass about 2390000 g. Minimum axial load factor A 1100 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 294/850 EF is the heavy 294 series, 850×1440×354 mm."
      },
      {
        "q": "What do E, EM and EF mean on 294/850 EF?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the extra-large steel EF cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-850-EF",
      "294/850 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-900-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/900 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 900,
    "D_mm": 1520,
    "B_mm": 372,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 26700,
    "static_load_kN": 122000,
    "fatigue_load_limit_kN": 7200,
    "reference_speed_rpm": 160,
    "limiting_speed_rpm": 300,
    "max_rpm": 300,
    "weight_g": 2650000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 294/900 EF for very heavy one-direction axial load: 26700 kN dynamic and 122000 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 294/900 EF is the extra-large steel EF cage. A minimum axial load of factor A 1400 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. One direction only: 294/900 EF cannot be reversed to take opposite thrust — mirror a second bearing for reversing shafts, and keep housing and shaft seats square within the ISO 104 tolerances. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the extra-large steel EF cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors"
    ],
    "failure_modes": [
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "oil starvation at the sliding contact zones of large spherical roller thrust bearings on forced-feed trips",
      "electrical erosion of raceways on VFD-driven shafts without grounding or insulation",
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established"
    ],
    "pitfalls": [
      "At 900 mm bore and 2650 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/900 EF.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 26700/122000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1400 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 26700/122000 kN ratings and 2650000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What do E, EM and EF mean on 294/900 EF?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the extra-large steel EF cage."
      },
      {
        "q": "Where is the 294/900 EF typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      },
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1400 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 300 r/min."
      },
      {
        "q": "Which dimensions does the 294/900 EF have?",
        "a": "A 294/900 EF measures 900 mm bore × 1520 mm outside diameter × 372 mm width (35.433 × 59.843 × 14.646 in). From SKF catalogue PUB BU/P1 17000: dynamic C 26700 kN, static C0 122000 kN, fatigue limit Pu 7200 kN, reference speed 160 r/min, limiting speed 300 r/min, mass about 2650000 g. Minimum axial load factor A 1400 must be maintained in service."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-900-EF",
      "294/900 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-950-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/950 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 950,
    "D_mm": 1600,
    "B_mm": 390,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 28200,
    "static_load_kN": 132000,
    "fatigue_load_limit_kN": 7800,
    "reference_speed_rpm": 140,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "weight_g": 3070000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 294/950 EF denotes a self-aligning thrust bearing: the sphered back face of the housing washer follows seat misalignment while the extra-large steel EF cage guides the rollers under 390 mm of axial section. The designation 294/950 EF separates into 294 (series), 950 mm (slash-size) (950 mm bore — bore 950 mm is written directly after the slash) and EF; washers are separable for individual mounting. A minimum axial load of factor A 1700 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Static safety matters for shock duty: compare peak axial force against C0 132000 kN with the application's static factor, since crane hooks and screw positions see their worst load at zero or low speed. Verify the minimum axial load (factor A 1700) immediately at commissioning — a cold start unloaded smears the rollers; spring preload or rotor weight must be present before the shaft rotates.",
    "applications": [
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force",
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "washer back-face fretting where the seat is too narrow to support the full ring face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "false brinelling and rust-red witness marks on standby machines under external vibration",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 950 mm bore and 3070 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "the 140 r/min reference speed is the thermal criterion under load, the 280 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "Radial force beyond the permitted fraction of simultaneous thrust (about 0.55·F_a) overloads one side of the barrel-roller set — add a radial bearing instead of leaning on 294/950 EF.",
      "The 28200/132000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 1700 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "The 28200/132000 kN ratings and 3070000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "How is the 294/950 EF designation read?",
        "a": "294 is the dimension series (heavy 294 series) and 950 mm (slash-size) the 950 mm bore (the bore is written directly after the slash (no bore code)); EF is the cage execution (extra-large steel EF cage). The sphered housing washer provides self-alignment."
      },
      {
        "q": "Why is the minimum axial load (A 1700) so important?",
        "a": "Spherical roller thrust bearings skid and smear immediately when run unloaded — on large sizes factor A 1700 corresponds to a substantial force. Springs, oil lift or the rotor/load weight must be applied before rotation, including cold test runs."
      },
      {
        "q": "Can the 294/950 EF also carry radial load?",
        "a": "Yes, up to roughly 55 % of the simultaneous axial force, thanks to the steep contact angle of the barrel rollers. Beyond that mix, specify a separate radial bearing; the primary duty remains one-direction thrust."
      },
      {
        "q": "How is a 294/950 EF mounted?",
        "a": "Tight shaft washer on the 950 mm seat, sphered housing washer on its matching seating washer, induction heating for large sizes, oil at the catalogue level before start, and the factor-A 1700 preload verified at commissioning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-950-EF",
      "294/950 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-1000-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/1000 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 1000,
    "D_mm": 1670,
    "B_mm": 402,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 31100,
    "static_load_kN": 140000,
    "fatigue_load_limit_kN": 8650,
    "reference_speed_rpm": 130,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "weight_g": 3390000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "294/1000 EF is a spherical roller thrust bearing to ISO 104 in the heavy 294 series: asymmetrical barrel rollers running on a sphered housing washer, sized 1000×1670×402 mm, as listed in SKF catalogue PUB BU/P1 17000 ch. 13.1. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 294/1000 EF is the extra-large steel EF cage. A minimum axial load of factor A 1900 must be maintained — in the large 294 sizes this is a real force (often supplied by springs, oil pressure or the rotor weight), below it the rollers skid and smear. Minimum axial load is explicit at factor A 1900: below F_am = A·n² (or the catalogue's slow-speed floor) the barrel rollers skid; springs or the rotor's own weight are part of the selection, not an accessory. Large 294 bearings go on with induction heating (max 120 °C) and oil injection features on tapered seats; never strike the extra-large steel EF cage, and fill the oil bath to the catalogue level before first start.",
    "applications": [
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load",
      "marine shaft and rudder-style thrust positions with seat deflection",
      "paper machine calender and refiner discs with combined axial and radial force"
    ],
    "failure_modes": [
      "smearing at roller-raceway contacts during unloaded startup before the oil film or preload is established",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "grease churning and overheating when a high-speed thrust position is over-packed",
      "brinelling of washer raceways from impact or mounting force applied through the rolling elements",
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust"
    ],
    "pitfalls": [
      "At 1000 mm bore and 3390 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "the 130 r/min reference speed is the thermal criterion under load, the 260 r/min limiting speed is the mechanical ceiling; large 294 bearings are normally run well below it with oil cooling.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The 31100/140000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "The 31100/140000 kN ratings and 3390000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "What destroys a spherical roller thrust bearing?",
        "a": "Unloaded rotation below A 1900 (roller smearing), interrupted oil supply on the large sizes, a missing sphered seating washer that removes alignment, and contamination. Limiting speed here is 260 r/min."
      },
      {
        "q": "Which dimensions does the 294/1000 EF have?",
        "a": "A 294/1000 EF measures 1000 mm bore × 1670 mm outside diameter × 402 mm width (39.37 × 65.748 × 15.827 in). From SKF catalogue PUB BU/P1 17000: dynamic C 31100 kN, static C0 140000 kN, fatigue limit Pu 8650 kN, reference speed 130 r/min, limiting speed 260 r/min, mass about 3390000 g. Minimum axial load factor A 1900 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 294/1000 EF is the heavy 294 series, 1000×1670×402 mm."
      },
      {
        "q": "What do E, EM and EF mean on 294/1000 EF?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the extra-large steel EF cage."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-1000-EF",
      "294/1000 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "294-1060-EF",
    "brand": "SKF",
    "manufacturer_designation": "294/1060 EF",
    "series": "29400-series",
    "type": "spherical_roller_thrust",
    "d_mm": 1060,
    "D_mm": 1770,
    "B_mm": 426,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 33400,
    "static_load_kN": 156000,
    "fatigue_load_limit_kN": 8500,
    "reference_speed_rpm": 120,
    "limiting_speed_rpm": 240,
    "max_rpm": 240,
    "weight_g": 4280000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 104",
    "naming_rule_text": "SKF supplies 294/1060 EF for very heavy one-direction axial load: 33400 kN dynamic and 156000 kN static, with the spherical seat absorbing shaft deflection and some simultaneous radial force. SKF suffixes on spherical roller thrust bearings describe cages: E the steel window cage for the larger sizes, EM the machined brass execution, EF the extra-large steel-cage design; 294/1060 EF is the extra-large steel EF cage. The extra-large steel EF cage is matched to size: the EF steel cage is built for the extra-large sizes where a pressed cage would deform. The sphered housing washer self-aligns during mounting and under shaft deflection. Selection arithmetic: C 33400 kN against C0 156000 kN gives a C0/C ratio of 4.67 — thrust bearings are chosen on static rating and F_a/C0 more often than on L10 life. Mounting: fit the shaft washer tight on the 1060 mm seat, seat the sphered housing washer on its matching (often separately supplied) seating washer, and check the assembly swivels freely before applying the 33400 kN working load.",
    "applications": [
      "crane hook assemblies where the hook block turns under full load",
      "injection moulding machine and extruder screw thrust positions",
      "vertical hydro generators and large vertical pump motors",
      "coal mill, cement mill and sugar mill thrust bearings under shock load"
    ],
    "failure_modes": [
      "cage wear from rollers being dragged through unloaded zones under fluctuating thrust",
      "housing-washer rotation scored into an unmachined or loose seating face",
      "abrasive paste forming as dust bypasses the housing seals into the open washer set",
      "hard-particle indentation where oil or grease filtration is inadequate",
      "roller skidding and raceway glazing once the thrust falls below the catalogue minimum axial load (factor A)"
    ],
    "pitfalls": [
      "At 1060 mm bore and 4280 kg, mounting is a rigging operation: sphered seats, oil injection and rotation checks under preload follow the large-bearing mounting manual, not general practice.",
      "The 33400/156000 kN figures assume the matching sphered seating washer is fitted where the catalogue calls for it; a flat housing seat removes the self-aligning function.",
      "Minimum load factor A 2300 dominates commissioning: start the oil flow and preload before rotation, especially on 294 bearings where an unloaded cold start smears the rollers.",
      "E, EM and EF suffixes are cage designs for different size bands, not quality grades: substitute only within the same envelope and check the lubricant compatibility of the cage material.",
      "The spherical seat tolerates static misalignment, not a continuously rocking housing — a loose sphered seat frets under oscillation and needs the catalogue seat tolerances plus clean, greased contact.",
      "The 33400/156000 kN ratings and 4280000 g mass are SKF catalogue values transcribed from ch. 13.1 of PUB BU/P1 17000 (PDF table page 930); mounting data — the minimum axial load factor A — appears in the running text because the structured record carries the boundary envelope only."
    ],
    "faq": [
      {
        "q": "Which dimensions does the 294/1060 EF have?",
        "a": "A 294/1060 EF measures 1060 mm bore × 1770 mm outside diameter × 426 mm width (41.732 × 69.685 × 16.772 in). From SKF catalogue PUB BU/P1 17000: dynamic C 33400 kN, static C0 156000 kN, fatigue limit Pu 8500 kN, reference speed 120 r/min, limiting speed 240 r/min, mass about 4280000 g. Minimum axial load factor A 2300 must be maintained in service."
      },
      {
        "q": "What is the difference between 292, 293 and 294 series?",
        "a": "292 is the light, fastest section; 293 the medium; 294 the heaviest with the largest OD per bore and the greatest thrust capacity. 294/1060 EF is the heavy 294 series, 1060×1770×426 mm."
      },
      {
        "q": "What do E, EM and EF mean on 294/1060 EF?",
        "a": "They are cage designs for different size bands: E is the stamped steel window cage of the current design, EM the machined brass cage for heavy/slow sizes, EF the steel cage for extra-large bearings — not quality grades. This bearing carries the extra-large steel EF cage."
      },
      {
        "q": "Where is the 294/1060 EF typically used?",
        "a": "Crane hook blocks, extruder and injection-moulding screws, vertical hydro generators, large gearbox thrust positions and heavy mill shafts — places with very high one-direction axial load plus shaft deflection."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "294",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 13.1 spherical roller thrust bearings",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "294-1060-EF",
      "294/1060 EF"
    ],
    "locale_variants": {}
  },
  {
    "sku": "135-TN9",
    "brand": "SKF",
    "manufacturer_designation": "135 TN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 5,
    "D_mm": 19,
    "B_mm": 6,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 2.51,
    "static_load_kN": 0.48,
    "fatigue_load_limit_kN": 0.025,
    "reference_speed_rpm": 63000,
    "limiting_speed_rpm": 45000,
    "max_rpm": 45000,
    "weight_g": 9,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the final digit of 135 is the bore in millimetres: 135 TN9 fits a 5 mm shaft (direct miniature spelling). Envelope 5×19×6 mm (0.197×0.748×0.236 in) with a 7.0 mm radial section height, C 2.51 kN, C0 0.48 kN and Pu 0.025 kN. The open 135 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 5 mm shaft. Reference (thermal) speed 63000 r/min, limiting speed 45000 r/min, catalogue mass 9 g.",
    "applications": [
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 135-TN9 (C 2.51 kN, C0 0.48 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 135-TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The TN9 suffix on 135-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 45000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 135-TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.025 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 5 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 135-TN9?",
        "a": "SKF 135 TN9 measures 5 mm bore × 19 mm OD × 6 mm width (0.197 × 0.748 × 0.236 in), mass about 9 g. It is open, with no shields or seals."
      },
      {
        "q": "How do I read the 135 designation?",
        "a": "Miniature self-aligning bearings print the bore as the final digit, so 135 is a 5 mm bearing; the leading digits give the section family."
      },
      {
        "q": "Can 135-TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 135-TN9?",
        "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 19 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "135",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "135-TN9",
      "135 TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "126-TN9",
    "brand": "SKF",
    "manufacturer_designation": "126 TN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 6,
    "D_mm": 19,
    "B_mm": 6,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 2.51,
    "static_load_kN": 0.48,
    "fatigue_load_limit_kN": 0.025,
    "reference_speed_rpm": 70000,
    "limiting_speed_rpm": 45000,
    "max_rpm": 45000,
    "weight_g": 9,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the final digit of 126 is the bore in millimetres: 126 TN9 fits a 6 mm shaft (direct miniature spelling). Envelope 6×19×6 mm (0.236×0.748×0.236 in) with a 6.5 mm radial section height, C 2.51 kN, C0 0.48 kN and Pu 0.025 kN. The open 126 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 6 mm shaft. Reference (thermal) speed 70000 r/min, limiting speed 45000 r/min, catalogue mass 9 g.",
    "applications": [
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 126-TN9 (C 2.51 kN, C0 0.48 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The fatigue load limit is 0.025 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The TN9 suffix on 126-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 45000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 126-TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.025 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 6 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 126-TN9?",
        "a": "SKF 126 TN9 measures 6 mm bore × 19 mm OD × 6 mm width (0.236 × 0.748 × 0.236 in), mass about 9 g. It is open, with no shields or seals."
      },
      {
        "q": "How do I read the 126 designation?",
        "a": "Miniature self-aligning bearings print the bore as the final digit, so 126 is a 6 mm bearing; the leading digits give the section family."
      },
      {
        "q": "What is the speed rating of 126-TN9?",
        "a": "SKF lists a 70000 r/min thermal reference speed and a 45000 r/min mechanical limiting speed for 126 TN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 126-TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 126-TN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "126",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "126-TN9",
      "126 TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "127-TN9",
    "brand": "SKF",
    "manufacturer_designation": "127 TN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 7,
    "D_mm": 22,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 2.65,
    "static_load_kN": 0.56,
    "fatigue_load_limit_kN": 0.029,
    "reference_speed_rpm": 63000,
    "limiting_speed_rpm": 40000,
    "max_rpm": 40000,
    "weight_g": 14,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the final digit of 127 is the bore in millimetres: 127 TN9 fits a 7 mm shaft (direct miniature spelling). Envelope 7×22×7 mm (0.276×0.866×0.276 in) with a 7.5 mm radial section height, C 2.65 kN, C0 0.56 kN and Pu 0.029 kN. The open 127 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 7 mm shaft. Reference (thermal) speed 63000 r/min, limiting speed 40000 r/min, catalogue mass 14 g.",
    "applications": [
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 7 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Assign interference to the rotating ring: on a 7 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The TN9 suffix on 127-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 40000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 127-TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 7 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 127-TN9 (C 2.65 kN, C0 0.56 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 127-TN9?",
        "a": "SKF 127 TN9 measures 7 mm bore × 22 mm OD × 7 mm width (0.276 × 0.866 × 0.276 in), mass about 14 g. It is open, with no shields or seals."
      },
      {
        "q": "How do I read the 127 designation?",
        "a": "Miniature self-aligning bearings print the bore as the final digit, so 127 is a 7 mm bearing; the leading digits give the section family."
      },
      {
        "q": "Which fits should I use for 127-TN9?",
        "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 22 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 127-TN9?",
        "a": "Catalogue mass is 14 g for 127 TN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "127",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "127-TN9",
      "127 TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "108-TN9",
    "brand": "SKF",
    "manufacturer_designation": "108 TN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 8,
    "D_mm": 22,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 2.65,
    "static_load_kN": 0.56,
    "fatigue_load_limit_kN": 0.029,
    "reference_speed_rpm": 60000,
    "limiting_speed_rpm": 40000,
    "max_rpm": 40000,
    "weight_g": 14,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 10xx series is a self-aligning ball bearing family. the final digit of 108 is the bore in millimetres: 108 TN9 fits a 8 mm shaft (direct miniature spelling). Envelope 8×22×7 mm (0.315×0.866×0.276 in) with a 7.0 mm radial section height, C 2.65 kN, C0 0.56 kN and Pu 0.029 kN. The open 108 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 8 mm shaft. Reference (thermal) speed 60000 r/min, limiting speed 40000 r/min, catalogue mass 14 g.",
    "applications": [
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 108-TN9 (C 2.65 kN, C0 0.56 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 108-TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The TN9 suffix on 108-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 40000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 108-TN9 chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 108-TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 8 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 108-TN9?",
        "a": "SKF 108 TN9 measures 8 mm bore × 22 mm OD × 7 mm width (0.315 × 0.866 × 0.276 in), mass about 14 g. It is open, with no shields or seals."
      },
      {
        "q": "How do I read the 108 designation?",
        "a": "Miniature self-aligning bearings print the bore as the final digit, so 108 is a 8 mm bearing; the leading digits give the section family."
      },
      {
        "q": "What is the speed rating of 108-TN9?",
        "a": "SKF lists a 60000 r/min thermal reference speed and a 40000 r/min mechanical limiting speed for 108 TN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 108-TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 108-TN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "108",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "108-TN9",
      "108 TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "129-TN9",
    "brand": "SKF",
    "manufacturer_designation": "129 TN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 9,
    "D_mm": 26,
    "B_mm": 8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 3.9,
    "static_load_kN": 0.82,
    "fatigue_load_limit_kN": 0.043,
    "reference_speed_rpm": 60000,
    "limiting_speed_rpm": 38000,
    "max_rpm": 38000,
    "weight_g": 22,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the final digit of 129 is the bore in millimetres: 129 TN9 fits a 9 mm shaft (direct miniature spelling). Envelope 9×26×8 mm (0.354×1.024×0.315 in) with a 8.5 mm radial section height, C 3.9 kN, C0 0.82 kN and Pu 0.043 kN. The open 129 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 9 mm shaft. Reference (thermal) speed 60000 r/min, limiting speed 38000 r/min, catalogue mass 22 g.",
    "applications": [
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 129-TN9 chamfer so the 8 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Mount 129-TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The TN9 suffix on 129-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 38000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 129-TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 129-TN9 chamfer so the 8 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 129-TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 129-TN9?",
        "a": "SKF 129 TN9 measures 9 mm bore × 26 mm OD × 8 mm width (0.354 × 1.024 × 0.315 in), mass about 22 g. It is open, with no shields or seals."
      },
      {
        "q": "How do I read the 129 designation?",
        "a": "Miniature self-aligning bearings print the bore as the final digit, so 129 is a 9 mm bearing; the leading digits give the section family."
      },
      {
        "q": "Which fits should I use for 129-TN9?",
        "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 26 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 129-TN9?",
        "a": "Catalogue mass is 22 g for 129 TN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "129",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "129-TN9",
      "129 TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1200-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1200 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 5.53,
    "static_load_kN": 1.18,
    "fatigue_load_limit_kN": 0.061,
    "reference_speed_rpm": 56000,
    "limiting_speed_rpm": 36000,
    "max_rpm": 36000,
    "weight_g": 34,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). bore code 00 follows the 10/12/15/17 mm exception table, so 1200 fits a 10 mm shaft. Envelope 10×30×9 mm (0.394×1.181×0.354 in) with a 10.0 mm radial section height, C 5.53 kN, C0 1.18 kN and Pu 0.061 kN. The open 1200 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 10 mm shaft. Reference (thermal) speed 56000 r/min, limiting speed 36000 r/min, catalogue mass 34 g.",
    "applications": [
      "fan and blower shafts",
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 1200-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Fillet radii must clear the 1200-ETN9 chamfer so the 9 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The ETN9 suffix on 1200-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 36000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 1200-ETN9 (C 5.53 kN, C0 1.18 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1200-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.061 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1200-ETN9?",
        "a": "SKF 1200 ETN9 measures 10 mm bore × 30 mm OD × 9 mm width (0.394 × 1.181 × 0.354 in), mass about 34 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1200 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 1200 fits a 10 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "What load can 1200-ETN9 take?",
        "a": "Catalogue values for 1200 ETN9: dynamic C 5.53 kN, static C0 1.18 kN, fatigue limit Pu 0.061 kN. Use C in life calculation and C0 for static checks at 10 mm bore."
      },
      {
        "q": "What is the speed rating of 1200-ETN9?",
        "a": "SKF lists a 56000 r/min thermal reference speed and a 36000 r/min mechanical limiting speed for 1200 ETN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1200",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1200-ETN9",
      "1200 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2200-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2200 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 5.53,
    "static_load_kN": 1.18,
    "fatigue_load_limit_kN": 0.06,
    "limiting_speed_rpm": 17000,
    "max_rpm": 17000,
    "weight_g": 48,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). bore code 00 follows the 10/12/15/17 mm exception table, so 2200 fits a 10 mm shaft. Envelope 10×30×14 mm (0.394×1.181×0.551 in) with a 10.0 mm radial section height, C 5.53 kN, C0 1.18 kN and Pu 0.06 kN. SKF spells the sealed execution 2200 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 10 mm shaft. Limiting speed 17000 r/min, catalogue mass 48 g.",
    "applications": [
      "fan and blower shafts",
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 10 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Fillet radii must clear the 2200-E-2RS1TN9 chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Do not wash 2200-E-2RS1TN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "The E-2RS1TN9 suffix on 2200-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 17000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2200-E-2RS1TN9 chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2200-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2200-E-2RS1TN9?",
        "a": "SKF 2200 E-2RS1TN9 measures 10 mm bore × 30 mm OD × 14 mm width (0.394 × 1.181 × 0.551 in), mass about 48 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2200 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 2200 fits a 10 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "Which fits should I use for 2200-E-2RS1TN9?",
        "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 30 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2200-E-2RS1TN9?",
        "a": "Catalogue mass is 48 g for 2200 E-2RS1TN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2200",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×14 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2200-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×14 mm envelope, but catalogue C/C0 differ between executions (5.53/1.18 kN vs 8.06/1.73 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2200-E-2RS1TN9",
      "2200 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2200-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2200 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 8.06,
    "static_load_kN": 1.73,
    "fatigue_load_limit_kN": 0.09,
    "reference_speed_rpm": 50000,
    "limiting_speed_rpm": 34000,
    "max_rpm": 34000,
    "weight_g": 47,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). bore code 00 follows the 10/12/15/17 mm exception table, so 2200 fits a 10 mm shaft. Envelope 10×30×14 mm (0.394×1.181×0.551 in) with a 10.0 mm radial section height, C 8.06 kN, C0 1.73 kN and Pu 0.09 kN. The open 2200 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 10 mm shaft. Reference (thermal) speed 50000 r/min, limiting speed 34000 r/min, catalogue mass 47 g.",
    "applications": [
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2200-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2200-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The ETN9 suffix on 2200-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 34000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2200-ETN9 chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2200-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 10 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2200-ETN9?",
        "a": "SKF 2200 ETN9 measures 10 mm bore × 30 mm OD × 14 mm width (0.394 × 1.181 × 0.551 in), mass about 47 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2200 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 2200 fits a 10 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "What is the speed rating of 2200-ETN9?",
        "a": "SKF lists a 50000 r/min thermal reference speed and a 34000 r/min mechanical limiting speed for 2200 ETN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 2200-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2200-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2200",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2200-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×14 mm envelope, but catalogue C/C0 differ between executions (8.06/1.73 kN vs 5.53/1.18 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2200-ETN9",
      "2200 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1201-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1201 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 6.24,
    "static_load_kN": 1.43,
    "fatigue_load_limit_kN": 0.072,
    "reference_speed_rpm": 50000,
    "limiting_speed_rpm": 32000,
    "max_rpm": 32000,
    "weight_g": 40,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). bore code 01 follows the 10/12/15/17 mm exception table, so 1201 fits a 12 mm shaft. Envelope 12×32×10 mm (0.472×1.26×0.394 in) with a 10.0 mm radial section height, C 6.24 kN, C0 1.43 kN and Pu 0.072 kN. The open 1201 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 12 mm shaft. Reference (thermal) speed 50000 r/min, limiting speed 32000 r/min, catalogue mass 40 g.",
    "applications": [
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 1201-ETN9 (C 6.24 kN, C0 1.43 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1201-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The ETN9 suffix on 1201-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 32000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 1201-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.072 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 12 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1201-ETN9?",
        "a": "SKF 1201 ETN9 measures 12 mm bore × 32 mm OD × 10 mm width (0.472 × 1.26 × 0.394 in), mass about 40 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1201 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 1201 fits a 12 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "What is the speed rating of 1201-ETN9?",
        "a": "SKF lists a 50000 r/min thermal reference speed and a 32000 r/min mechanical limiting speed for 1201 ETN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1201-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1201-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1201",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1201-ETN9",
      "1201 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2201-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2201 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 6.24,
    "static_load_kN": 1.43,
    "fatigue_load_limit_kN": 0.08,
    "limiting_speed_rpm": 16000,
    "max_rpm": 16000,
    "weight_g": 53,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). bore code 01 follows the 10/12/15/17 mm exception table, so 2201 fits a 12 mm shaft. Envelope 12×32×14 mm (0.472×1.26×0.551 in) with a 10.0 mm radial section height, C 6.24 kN, C0 1.43 kN and Pu 0.08 kN. SKF spells the sealed execution 2201 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 12 mm shaft. Limiting speed 16000 r/min, catalogue mass 53 g.",
    "applications": [
      "textile spindles and looms",
      "fan and blower shafts",
      "woodworking machine spindles",
      "light gearbox layshafts"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2201-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The spherical outer raceway lets 2201-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The 2RS1 contact seals on 2201-E-2RS1TN9 add drag and cap speed at 16000 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "The E-2RS1TN9 suffix on 2201-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 16000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 2201-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2201-E-2RS1TN9 chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2201-E-2RS1TN9?",
        "a": "SKF 2201 E-2RS1TN9 measures 12 mm bore × 32 mm OD × 14 mm width (0.472 × 1.26 × 0.551 in), mass about 53 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2201 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 2201 fits a 12 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "Can 2201-E-2RS1TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2201-E-2RS1TN9?",
        "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 32 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2201",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×14 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2201-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×14 mm envelope, but catalogue C/C0 differ between executions (6.24/1.43 kN vs 8.52/1.9 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2201-E-2RS1TN9",
      "2201 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2201-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2201 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 8.52,
    "static_load_kN": 1.9,
    "fatigue_load_limit_kN": 0.098,
    "reference_speed_rpm": 45000,
    "limiting_speed_rpm": 30000,
    "max_rpm": 30000,
    "weight_g": 53,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). bore code 01 follows the 10/12/15/17 mm exception table, so 2201 fits a 12 mm shaft. Envelope 12×32×14 mm (0.472×1.26×0.551 in) with a 10.0 mm radial section height, C 8.52 kN, C0 1.9 kN and Pu 0.098 kN. The open 2201 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 12 mm shaft. Reference (thermal) speed 45000 r/min, limiting speed 30000 r/min, catalogue mass 53 g.",
    "applications": [
      "fan and blower shafts",
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2201-ETN9 chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Fillet radii must clear the 2201-ETN9 chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The ETN9 suffix on 2201-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 30000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 2201-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2201-ETN9 chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2201-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2201-ETN9?",
        "a": "SKF 2201 ETN9 measures 12 mm bore × 32 mm OD × 14 mm width (0.472 × 1.26 × 0.551 in), mass about 53 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2201 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 2201 fits a 12 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "What load can 2201-ETN9 take?",
        "a": "Catalogue values for 2201 ETN9: dynamic C 8.52 kN, static C0 1.9 kN, fatigue limit Pu 0.098 kN. Use C in life calculation and C0 for static checks at 12 mm bore."
      },
      {
        "q": "What is the speed rating of 2201-ETN9?",
        "a": "SKF lists a 45000 r/min thermal reference speed and a 30000 r/min mechanical limiting speed for 2201 ETN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2201",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2201-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×14 mm envelope, but catalogue C/C0 differ between executions (8.52/1.9 kN vs 6.24/1.43 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2201-ETN9",
      "2201 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1301-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1301 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 12,
    "D_mm": 37,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 9.36,
    "static_load_kN": 2.16,
    "fatigue_load_limit_kN": 0.12,
    "reference_speed_rpm": 40000,
    "limiting_speed_rpm": 28000,
    "max_rpm": 28000,
    "weight_g": 67,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). bore code 01 follows the 10/12/15/17 mm exception table, so 1301 fits a 12 mm shaft. Envelope 12×37×12 mm (0.472×1.457×0.472 in) with a 12.5 mm radial section height, C 9.36 kN, C0 2.16 kN and Pu 0.12 kN. The open 1301 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 12 mm shaft. Reference (thermal) speed 40000 r/min, limiting speed 28000 r/min, catalogue mass 67 g.",
    "applications": [
      "fan and blower shafts",
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 1301-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Fillet radii must clear the 1301-ETN9 chamfer so the 12 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The ETN9 suffix on 1301-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 28000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 1301-ETN9 (C 9.36 kN, C0 2.16 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1301-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.12 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1301-ETN9?",
        "a": "SKF 1301 ETN9 measures 12 mm bore × 37 mm OD × 12 mm width (0.472 × 1.457 × 0.472 in), mass about 67 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1301 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 1301 fits a 12 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "Which fits should I use for 1301-ETN9?",
        "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 37 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 1301-ETN9?",
        "a": "Catalogue mass is 67 g for 1301 ETN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1301",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1301-ETN9",
      "1301 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1202-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1202 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 7.41,
    "static_load_kN": 1.76,
    "fatigue_load_limit_kN": 0.09,
    "reference_speed_rpm": 45000,
    "limiting_speed_rpm": 28000,
    "max_rpm": 28000,
    "weight_g": 49,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). bore code 02 follows the 10/12/15/17 mm exception table, so 1202 fits a 15 mm shaft. Envelope 15×35×11 mm (0.591×1.378×0.433 in) with a 10.0 mm radial section height, C 7.41 kN, C0 1.76 kN and Pu 0.09 kN. The open 1202 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 15 mm shaft. Reference (thermal) speed 45000 r/min, limiting speed 28000 r/min, catalogue mass 49 g.",
    "applications": [
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 15 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Assign interference to the rotating ring: on a 15 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The ETN9 suffix on 1202-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 28000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1202-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 15 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 1202-ETN9 (C 7.41 kN, C0 1.76 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1202-ETN9?",
        "a": "SKF 1202 ETN9 measures 15 mm bore × 35 mm OD × 11 mm width (0.591 × 1.378 × 0.433 in), mass about 49 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1202 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 1202 fits a 15 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "How much misalignment can 1202-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1202-ETN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 1202-ETN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1202",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1202-ETN9",
      "1202 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2202-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2202 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 7.41,
    "static_load_kN": 1.76,
    "fatigue_load_limit_kN": 0.09,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 58,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). bore code 02 follows the 10/12/15/17 mm exception table, so 2202 fits a 15 mm shaft. Envelope 15×35×14 mm (0.591×1.378×0.551 in) with a 10.0 mm radial section height, C 7.41 kN, C0 1.76 kN and Pu 0.09 kN. SKF spells the sealed execution 2202 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 15 mm shaft. Limiting speed 14000 r/min, catalogue mass 58 g.",
    "applications": [
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 2202-E-2RS1TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Assign interference to the rotating ring: on a 15 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2202-E-2RS1TN9 to avoid seal-lip binding.",
      "The E-2RS1TN9 suffix on 2202-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 14000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 15 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 2202-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2202-E-2RS1TN9?",
        "a": "SKF 2202 E-2RS1TN9 measures 15 mm bore × 35 mm OD × 14 mm width (0.591 × 1.378 × 0.551 in), mass about 58 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2202 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 2202 fits a 15 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "How much misalignment can 2202-E-2RS1TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2202-E-2RS1TN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2202-E-2RS1TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2202",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×14 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2202-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×14 mm envelope, but catalogue C/C0 differ between executions (7.41/1.76 kN vs 8.71/2.04 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2202-E-2RS1TN9",
      "2202 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2202-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2202 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 8.71,
    "static_load_kN": 2.04,
    "fatigue_load_limit_kN": 0.11,
    "reference_speed_rpm": 38000,
    "limiting_speed_rpm": 26000,
    "max_rpm": 26000,
    "weight_g": 60,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). bore code 02 follows the 10/12/15/17 mm exception table, so 2202 fits a 15 mm shaft. Envelope 15×35×14 mm (0.591×1.378×0.551 in) with a 10.0 mm radial section height, C 8.71 kN, C0 2.04 kN and Pu 0.11 kN. The open 2202 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 15 mm shaft. Reference (thermal) speed 38000 r/min, limiting speed 26000 r/min, catalogue mass 60 g.",
    "applications": [
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.11 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Catalogue ratings for 2202-ETN9 (C 8.71 kN, C0 2.04 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The ETN9 suffix on 2202-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 26000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 15 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 2202-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2202-ETN9 chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2202-ETN9?",
        "a": "SKF 2202 ETN9 measures 15 mm bore × 35 mm OD × 14 mm width (0.591 × 1.378 × 0.551 in), mass about 60 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2202 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 2202 fits a 15 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "What is the speed rating of 2202-ETN9?",
        "a": "SKF lists a 38000 r/min thermal reference speed and a 26000 r/min mechanical limiting speed for 2202 ETN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 2202-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2202-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2202",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2202-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×14 mm envelope, but catalogue C/C0 differ between executions (8.71/2.04 kN vs 7.41/1.76 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2202-ETN9",
      "2202 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1302-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1302 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 10.8,
    "static_load_kN": 2.6,
    "fatigue_load_limit_kN": 0.14,
    "reference_speed_rpm": 34000,
    "limiting_speed_rpm": 24000,
    "max_rpm": 24000,
    "weight_g": 94,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). bore code 02 follows the 10/12/15/17 mm exception table, so 1302 fits a 15 mm shaft. Envelope 15×42×13 mm (0.591×1.654×0.512 in) with a 13.5 mm radial section height, C 10.8 kN, C0 2.6 kN and Pu 0.14 kN. The open 1302 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 15 mm shaft. Reference (thermal) speed 34000 r/min, limiting speed 24000 r/min, catalogue mass 94 g.",
    "applications": [
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1302-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Catalogue ratings for 1302-ETN9 (C 10.8 kN, C0 2.6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The ETN9 suffix on 1302-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 24000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 15 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 1302-ETN9 (C 10.8 kN, C0 2.6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1302-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1302-ETN9?",
        "a": "SKF 1302 ETN9 measures 15 mm bore × 42 mm OD × 13 mm width (0.591 × 1.654 × 0.512 in), mass about 94 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1302 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 1302 fits a 15 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "What is the speed rating of 1302-ETN9?",
        "a": "SKF lists a 34000 r/min thermal reference speed and a 24000 r/min mechanical limiting speed for 1302 ETN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1302-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1302-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1302",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1302-ETN9",
      "1302 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2302-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2302 E-2RS1TN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 10.8,
    "static_load_kN": 2.6,
    "fatigue_load_limit_kN": 0.14,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). bore code 02 follows the 10/12/15/17 mm exception table, so 2302 fits a 15 mm shaft. Envelope 15×42×17 mm (0.591×1.654×0.669 in) with a 13.5 mm radial section height, C 10.8 kN, C0 2.6 kN and Pu 0.14 kN. SKF spells the sealed execution 2302 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 15 mm shaft. Limiting speed 12000 r/min, catalogue mass 110 g.",
    "applications": [
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.14 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2302-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The 2RS1 contact seals on 2302-E-2RS1TN9 add drag and cap speed at 12000 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "The E-2RS1TN9 suffix on 2302-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 12000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.14 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 15 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2302-E-2RS1TN9?",
        "a": "SKF 2302 E-2RS1TN9 measures 15 mm bore × 42 mm OD × 17 mm width (0.591 × 1.654 × 0.669 in), mass about 110 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2302 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 2302 fits a 15 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "Can 2302-E-2RS1TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2302-E-2RS1TN9?",
        "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 42 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2302",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×17 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2302-E-2RS1TN9",
      "2302 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1203-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1203 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 8.84,
    "static_load_kN": 2.2,
    "fatigue_load_limit_kN": 0.12,
    "reference_speed_rpm": 38000,
    "limiting_speed_rpm": 24000,
    "max_rpm": 24000,
    "weight_g": 73,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). bore code 03 follows the 10/12/15/17 mm exception table, so 1203 fits a 17 mm shaft. Envelope 17×40×12 mm (0.669×1.575×0.472 in) with a 11.5 mm radial section height, C 8.84 kN, C0 2.2 kN and Pu 0.12 kN. The open 1203 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 17 mm shaft. Reference (thermal) speed 38000 r/min, limiting speed 24000 r/min, catalogue mass 73 g.",
    "applications": [
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1203-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Catalogue ratings for 1203-ETN9 (C 8.84 kN, C0 2.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The ETN9 suffix on 1203-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 24000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 17 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 1203-ETN9 (C 8.84 kN, C0 2.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1203-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1203-ETN9?",
        "a": "SKF 1203 ETN9 measures 17 mm bore × 40 mm OD × 12 mm width (0.669 × 1.575 × 0.472 in), mass about 73 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1203 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 1203 fits a 17 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "What is the speed rating of 1203-ETN9?",
        "a": "SKF lists a 38000 r/min thermal reference speed and a 24000 r/min mechanical limiting speed for 1203 ETN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1203-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1203-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1203",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1203-ETN9",
      "1203 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2203-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2203 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 8.84,
    "static_load_kN": 2.2,
    "fatigue_load_limit_kN": 0.12,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 89,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). bore code 03 follows the 10/12/15/17 mm exception table, so 2203 fits a 17 mm shaft. Envelope 17×40×16 mm (0.669×1.575×0.63 in) with a 11.5 mm radial section height, C 8.84 kN, C0 2.2 kN and Pu 0.12 kN. SKF spells the sealed execution 2203 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 17 mm shaft. Limiting speed 12000 r/min, catalogue mass 89 g.",
    "applications": [
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.12 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2203-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The 2RS1 contact seals on 2203-E-2RS1TN9 add drag and cap speed at 12000 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "The E-2RS1TN9 suffix on 2203-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 12000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.12 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 17 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2203-E-2RS1TN9?",
        "a": "SKF 2203 E-2RS1TN9 measures 17 mm bore × 40 mm OD × 16 mm width (0.669 × 1.575 × 0.63 in), mass about 89 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2203 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 2203 fits a 17 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "Can 2203-E-2RS1TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2203-E-2RS1TN9?",
        "a": "With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 40 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2203",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×16 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2203-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×16 mm envelope, but catalogue C/C0 differ between executions (8.84/2.2 kN vs 10.6/2.55 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2203-E-2RS1TN9",
      "2203 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2203-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2203 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 10.6,
    "static_load_kN": 2.55,
    "fatigue_load_limit_kN": 0.14,
    "reference_speed_rpm": 34000,
    "limiting_speed_rpm": 24000,
    "max_rpm": 24000,
    "weight_g": 88,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). bore code 03 follows the 10/12/15/17 mm exception table, so 2203 fits a 17 mm shaft. Envelope 17×40×16 mm (0.669×1.575×0.63 in) with a 11.5 mm radial section height, C 10.6 kN, C0 2.55 kN and Pu 0.14 kN. The open 2203 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 17 mm shaft. Reference (thermal) speed 34000 r/min, limiting speed 24000 r/min, catalogue mass 88 g.",
    "applications": [
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 17 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Assign interference to the rotating ring: on a 17 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The ETN9 suffix on 2203-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 24000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.14 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 17 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 2203-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2203-ETN9?",
        "a": "SKF 2203 ETN9 measures 17 mm bore × 40 mm OD × 16 mm width (0.669 × 1.575 × 0.63 in), mass about 88 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2203 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 2203 fits a 17 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "How much misalignment can 2203-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2203-ETN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2203-ETN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2203",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2203-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×16 mm envelope, but catalogue C/C0 differ between executions (10.6/2.55 kN vs 8.84/2.2 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2203-ETN9",
      "2203 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1303-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1303 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 12.7,
    "static_load_kN": 3.4,
    "fatigue_load_limit_kN": 0.18,
    "reference_speed_rpm": 28000,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 120,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). bore code 03 follows the 10/12/15/17 mm exception table, so 1303 fits a 17 mm shaft. Envelope 17×47×14 mm (0.669×1.85×0.551 in) with a 15.0 mm radial section height, C 12.7 kN, C0 3.4 kN and Pu 0.18 kN. The open 1303 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 17 mm shaft. Reference (thermal) speed 28000 r/min, limiting speed 20000 r/min, catalogue mass 120 g.",
    "applications": [
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 17 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Assign interference to the rotating ring: on a 17 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The ETN9 suffix on 1303-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 20000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1303-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 17 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 1303-ETN9 (C 12.7 kN, C0 3.4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1303-ETN9?",
        "a": "SKF 1303 ETN9 measures 17 mm bore × 47 mm OD × 14 mm width (0.669 × 1.85 × 0.551 in), mass about 120 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1303 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 1303 fits a 17 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "How much misalignment can 1303-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1303-ETN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 1303-ETN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1303",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1303-ETN9",
      "1303 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2303-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2303 E-2RS1TN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 12.7,
    "static_load_kN": 3.4,
    "fatigue_load_limit_kN": 0.18,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). bore code 03 follows the 10/12/15/17 mm exception table, so 2303 fits a 17 mm shaft. Envelope 17×47×19 mm (0.669×1.85×0.748 in) with a 15.0 mm radial section height, C 12.7 kN, C0 3.4 kN and Pu 0.18 kN. SKF spells the sealed execution 2303 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 17 mm shaft. Limiting speed 11000 r/min, catalogue mass 160 g.",
    "applications": [
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 2303-E-2RS1TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Assign interference to the rotating ring: on a 17 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2303-E-2RS1TN9 to avoid seal-lip binding.",
      "The E-2RS1TN9 suffix on 2303-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 11000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 17 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 2303-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2303-E-2RS1TN9?",
        "a": "SKF 2303 E-2RS1TN9 measures 17 mm bore × 47 mm OD × 19 mm width (0.669 × 1.85 × 0.748 in), mass about 160 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2303 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 2303 fits a 17 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "How much misalignment can 2303-E-2RS1TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2303-E-2RS1TN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2303-E-2RS1TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2303",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×19 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2303-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×19 mm envelope, but catalogue C/C0 differ between executions (12.7/3.4 kN vs 14.3/3.55 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2303-E-2RS1TN9",
      "2303 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2303-M",
    "brand": "SKF",
    "manufacturer_designation": "2303 M",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 3.55,
    "fatigue_load_limit_kN": 0.19,
    "reference_speed_rpm": 30000,
    "limiting_speed_rpm": 22000,
    "max_rpm": 22000,
    "weight_g": 180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). bore code 03 follows the 10/12/15/17 mm exception table, so 2303 fits a 17 mm shaft. Envelope 17×47×19 mm (0.669×1.85×0.748 in) with a 15.0 mm radial section height, C 14.3 kN, C0 3.55 kN and Pu 0.19 kN. The open 2303 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution. The bore is cylindrical (straight), for a press-fit on a 17 mm shaft. Reference (thermal) speed 30000 r/min, limiting speed 22000 r/min, catalogue mass 180 g.",
    "applications": [
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts",
      "woodworking machine spindles"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2303-M chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "At 17 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The M suffix on 2303-M denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2303-M (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 17 mm rotating shaft use a j5/k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2303-M (C 14.3 kN, C0 3.55 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2303-M?",
        "a": "SKF 2303 M measures 17 mm bore × 47 mm OD × 19 mm width (0.669 × 1.85 × 0.748 in), mass about 180 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2303 work?",
        "a": "Codes 00–03 follow the exception table (10, 12, 15, 17 mm): 2303 fits a 17 mm shaft. Code × 5 starts at code 04."
      },
      {
        "q": "What load can 2303-M take?",
        "a": "Catalogue values for 2303 M: dynamic C 14.3 kN, static C0 3.55 kN, fatigue limit Pu 0.19 kN. Use C in life calculation and C0 for static checks at 17 mm bore."
      },
      {
        "q": "What is the speed rating of 2303-M?",
        "a": "SKF lists a 30000 r/min thermal reference speed and a 22000 r/min mechanical limiting speed for 2303 M; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2303",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2303-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×19 mm envelope, but catalogue C/C0 differ between executions (14.3/3.55 kN vs 12.7/3.4 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2303-M",
      "2303 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1204-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1204 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 12.7,
    "static_load_kN": 3.4,
    "fatigue_load_limit_kN": 0.18,
    "reference_speed_rpm": 32000,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 120,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1204 carries code 04 = 20 mm (code × 5). Envelope 20×47×14 mm (0.787×1.85×0.551 in) with a 13.5 mm radial section height, C 12.7 kN, C0 3.4 kN and Pu 0.18 kN. The open 1204 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 20 mm shaft. Reference (thermal) speed 32000 r/min, limiting speed 20000 r/min, catalogue mass 120 g.",
    "applications": [
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 1204-ETN9 chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Mount 1204-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The ETN9 suffix on 1204-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 20000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 1204-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 1204-ETN9 chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1204-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1204-ETN9?",
        "a": "SKF 1204 ETN9 measures 20 mm bore × 47 mm OD × 14 mm width (0.787 × 1.85 × 0.551 in), mass about 120 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1204 work?",
        "a": "The final two digits of 1204 are bore code 04, multiplied by 5 to give 20 mm."
      },
      {
        "q": "What load can 1204-ETN9 take?",
        "a": "Catalogue values for 1204 ETN9: dynamic C 12.7 kN, static C0 3.4 kN, fatigue limit Pu 0.18 kN. Use C in life calculation and C0 for static checks at 20 mm bore."
      },
      {
        "q": "What is the speed rating of 1204-ETN9?",
        "a": "SKF lists a 32000 r/min thermal reference speed and a 20000 r/min mechanical limiting speed for 1204 ETN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1204",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1204-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 1204 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11204-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 11204 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1204-ETN9",
      "1204 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1204-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1204 EKTN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 12.7,
    "static_load_kN": 3.4,
    "fatigue_load_limit_kN": 0.18,
    "reference_speed_rpm": 32000,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 120,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1204 carries code 04 = 20 mm (code × 5). Envelope 20×47×14 mm (0.787×1.85×0.551 in) with a 13.5 mm radial section height, C 12.7 kN, C0 3.4 kN and Pu 0.18 kN. The open 1204 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 32000 r/min, limiting speed 20000 r/min, catalogue mass 120 g.",
    "applications": [
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1204-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1204-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The EKTN9 suffix on 1204-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 20000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.18 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 20 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1204-EKTN9?",
        "a": "SKF 1204 EKTN9 measures 20 mm bore × 47 mm OD × 14 mm width (0.787 × 1.85 × 0.551 in), mass about 120 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1204 work?",
        "a": "The final two digits of 1204 are bore code 04, multiplied by 5 to give 20 mm."
      },
      {
        "q": "Can 1204-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 1204-EKTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 47 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1204",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1204-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 1204 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11204-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 11204 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1204-EKTN9",
      "1204 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2204-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2204 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 12.7,
    "static_load_kN": 3.4,
    "fatigue_load_limit_kN": 0.18,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2204 carries code 04 = 20 mm (code × 5). Envelope 20×47×18 mm (0.787×1.85×0.709 in) with a 13.5 mm radial section height, C 12.7 kN, C0 3.4 kN and Pu 0.18 kN. SKF spells the sealed execution 2204 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 20 mm shaft. Limiting speed 10000 r/min, catalogue mass 140 g.",
    "applications": [
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 20 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Mount 2204-E-2RS1TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Do not wash 2204-E-2RS1TN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "The E-2RS1TN9 suffix on 2204-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 10000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 2204-E-2RS1TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.18 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2204-E-2RS1TN9?",
        "a": "SKF 2204 E-2RS1TN9 measures 20 mm bore × 47 mm OD × 18 mm width (0.787 × 1.85 × 0.709 in), mass about 140 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2204 work?",
        "a": "The final two digits of 2204 are bore code 04, multiplied by 5 to give 20 mm."
      },
      {
        "q": "Which fits should I use for 2204-E-2RS1TN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 47 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2204-E-2RS1TN9?",
        "a": "Catalogue mass is 140 g for 2204 E-2RS1TN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2204",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×18 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2204-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×18 mm envelope, but catalogue C/C0 differ between executions (12.7/3.4 kN vs 16.8/4.15 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2204-E-2RS1TN9",
      "2204 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2204-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2204 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 16.8,
    "static_load_kN": 4.15,
    "fatigue_load_limit_kN": 0.22,
    "reference_speed_rpm": 28000,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2204 carries code 04 = 20 mm (code × 5). Envelope 20×47×18 mm (0.787×1.85×0.709 in) with a 13.5 mm radial section height, C 16.8 kN, C0 4.15 kN and Pu 0.22 kN. The open 2204 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 20 mm shaft. Reference (thermal) speed 28000 r/min, limiting speed 20000 r/min, catalogue mass 140 g.",
    "applications": [
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 2204-ETN9 (C 16.8 kN, C0 4.15 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The fatigue load limit is 0.22 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The ETN9 suffix on 2204-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 20000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 2204-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.22 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 20 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2204-ETN9?",
        "a": "SKF 2204 ETN9 measures 20 mm bore × 47 mm OD × 18 mm width (0.787 × 1.85 × 0.709 in), mass about 140 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2204 work?",
        "a": "The final two digits of 2204 are bore code 04, multiplied by 5 to give 20 mm."
      },
      {
        "q": "Can 2204-ETN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2204-ETN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 47 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2204",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2204-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×18 mm envelope, but catalogue C/C0 differ between executions (16.8/4.15 kN vs 12.7/3.4 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2204-ETN9",
      "2204 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1304-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1304 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 4,
    "fatigue_load_limit_kN": 0.21,
    "reference_speed_rpm": 26000,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1304 carries code 04 = 20 mm (code × 5). Envelope 20×52×15 mm (0.787×2.047×0.591 in) with a 16.0 mm radial section height, C 14.3 kN, C0 4 kN and Pu 0.21 kN. The open 1304 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 20 mm shaft. Reference (thermal) speed 26000 r/min, limiting speed 18000 r/min, catalogue mass 160 g.",
    "applications": [
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 1304-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The fatigue load limit is 0.21 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The ETN9 suffix on 1304-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 18000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 1304-ETN9 chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1304-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 20 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1304-ETN9?",
        "a": "SKF 1304 ETN9 measures 20 mm bore × 52 mm OD × 15 mm width (0.787 × 2.047 × 0.591 in), mass about 160 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1304 work?",
        "a": "The final two digits of 1304 are bore code 04, multiplied by 5 to give 20 mm."
      },
      {
        "q": "How heavy is 1304-ETN9?",
        "a": "Catalogue mass is 160 g for 1304 ETN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 1304-ETN9 take?",
        "a": "Catalogue values for 1304 ETN9: dynamic C 14.3 kN, static C0 4 kN, fatigue limit Pu 0.21 kN. Use C in life calculation and C0 for static checks at 20 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1304",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1304-ETN9",
      "1304 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2304-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2304 E-2RS1TN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 4,
    "fatigue_load_limit_kN": 0.21,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 210,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2304 carries code 04 = 20 mm (code × 5). Envelope 20×52×21 mm (0.787×2.047×0.827 in) with a 16.0 mm radial section height, C 14.3 kN, C0 4 kN and Pu 0.21 kN. SKF spells the sealed execution 2304 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 20 mm shaft. Limiting speed 9000 r/min, catalogue mass 210 g.",
    "applications": [
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 2304-E-2RS1TN9 (C 14.3 kN, C0 4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Catalogue ratings for 2304-E-2RS1TN9 (C 14.3 kN, C0 4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Do not wash 2304-E-2RS1TN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "The E-2RS1TN9 suffix on 2304-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 2304-E-2RS1TN9 (C 14.3 kN, C0 4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 2304-E-2RS1TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2304-E-2RS1TN9?",
        "a": "SKF 2304 E-2RS1TN9 measures 20 mm bore × 52 mm OD × 21 mm width (0.787 × 2.047 × 0.827 in), mass about 210 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2304 work?",
        "a": "The final two digits of 2304 are bore code 04, multiplied by 5 to give 20 mm."
      },
      {
        "q": "What is the speed rating of 2304-E-2RS1TN9?",
        "a": "SKF publishes only the 9000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      },
      {
        "q": "How much misalignment can 2304-E-2RS1TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2304-E-2RS1TN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2304",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×21 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2304-TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×21 mm envelope, but catalogue C/C0 differ between executions (14.3/4 kN vs 18.2/4.75 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2304-E-2RS1TN9",
      "2304 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2304-TN9",
    "brand": "SKF",
    "manufacturer_designation": "2304 TN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 18.2,
    "static_load_kN": 4.75,
    "fatigue_load_limit_kN": 0.24,
    "reference_speed_rpm": 26000,
    "limiting_speed_rpm": 19000,
    "max_rpm": 19000,
    "weight_g": 220,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2304 carries code 04 = 20 mm (code × 5). Envelope 20×52×21 mm (0.787×2.047×0.827 in) with a 16.0 mm radial section height, C 18.2 kN, C0 4.75 kN and Pu 0.24 kN. The open 2304 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 20 mm shaft. Reference (thermal) speed 26000 r/min, limiting speed 19000 r/min, catalogue mass 220 g.",
    "applications": [
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.24 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The fatigue load limit is 0.24 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The TN9 suffix on 2304-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 19000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2304-TN9 chamfer so the 21 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2304-TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 20 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2304-TN9?",
        "a": "SKF 2304 TN9 measures 20 mm bore × 52 mm OD × 21 mm width (0.787 × 2.047 × 0.827 in), mass about 220 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2304 work?",
        "a": "The final two digits of 2304 are bore code 04, multiplied by 5 to give 20 mm."
      },
      {
        "q": "How heavy is 2304-TN9?",
        "a": "Catalogue mass is 220 g for 2304 TN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2304-TN9 take?",
        "a": "Catalogue values for 2304 TN9: dynamic C 18.2 kN, static C0 4.75 kN, fatigue limit Pu 0.24 kN. Use C in life calculation and C0 for static checks at 20 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2304",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2304-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×21 mm envelope, but catalogue C/C0 differ between executions (18.2/4.75 kN vs 14.3/4 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2304-TN9",
      "2304 TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1205-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1205 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 4,
    "fatigue_load_limit_kN": 0.21,
    "reference_speed_rpm": 28000,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1205 carries code 05 = 25 mm (code × 5). Envelope 25×52×15 mm (0.984×2.047×0.591 in) with a 13.5 mm radial section height, C 14.3 kN, C0 4 kN and Pu 0.21 kN. The open 1205 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 25 mm shaft. Reference (thermal) speed 28000 r/min, limiting speed 18000 r/min, catalogue mass 140 g.",
    "applications": [
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 1205-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The fatigue load limit is 0.21 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The ETN9 suffix on 1205-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 18000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 1205-ETN9 chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1205-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 25 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1205-ETN9?",
        "a": "SKF 1205 ETN9 measures 25 mm bore × 52 mm OD × 15 mm width (0.984 × 2.047 × 0.591 in), mass about 140 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1205 work?",
        "a": "The final two digits of 1205 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "What is the speed rating of 1205-ETN9?",
        "a": "SKF lists a 28000 r/min thermal reference speed and a 18000 r/min mechanical limiting speed for 1205 ETN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1205-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1205-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1205",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1205-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 1205 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11205-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 11205 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1205-ETN9",
      "1205 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1205-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1205 EKTN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 4,
    "fatigue_load_limit_kN": 0.21,
    "reference_speed_rpm": 28000,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1205 carries code 05 = 25 mm (code × 5). Envelope 25×52×15 mm (0.984×2.047×0.591 in) with a 13.5 mm radial section height, C 14.3 kN, C0 4 kN and Pu 0.21 kN. The open 1205 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 28000 r/min, limiting speed 18000 r/min, catalogue mass 140 g.",
    "applications": [
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts",
      "woodworking machine spindles"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 1205-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "At 25 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The EKTN9 suffix on 1205-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 18000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 25 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 1205-EKTN9 (C 14.3 kN, C0 4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1205-EKTN9?",
        "a": "SKF 1205 EKTN9 measures 25 mm bore × 52 mm OD × 15 mm width (0.984 × 2.047 × 0.591 in), mass about 140 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1205 work?",
        "a": "The final two digits of 1205 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "What load can 1205-EKTN9 take?",
        "a": "Catalogue values for 1205 EKTN9: dynamic C 14.3 kN, static C0 4 kN, fatigue limit Pu 0.21 kN. Use C in life calculation and C0 for static checks at 25 mm bore."
      },
      {
        "q": "What is the speed rating of 1205-EKTN9?",
        "a": "SKF lists a 28000 r/min thermal reference speed and a 18000 r/min mechanical limiting speed for 1205 EKTN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1205",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1205-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 1205 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11205-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 11205 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1205-EKTN9",
      "1205 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2205-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2205 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 4,
    "fatigue_load_limit_kN": 0.21,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2205 carries code 05 = 25 mm (code × 5). Envelope 25×52×18 mm (0.984×2.047×0.709 in) with a 13.5 mm radial section height, C 14.3 kN, C0 4 kN and Pu 0.21 kN. SKF spells the sealed execution 2205 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 25 mm shaft. Limiting speed 9000 r/min, catalogue mass 160 g.",
    "applications": [
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 2205-E-2RS1TN9 (C 14.3 kN, C0 4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Catalogue ratings for 2205-E-2RS1TN9 (C 14.3 kN, C0 4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2205-E-2RS1TN9 to avoid seal-lip binding.",
      "The E-2RS1TN9 suffix on 2205-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 2205-E-2RS1TN9 (C 14.3 kN, C0 4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 2205-E-2RS1TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2205-E-2RS1TN9?",
        "a": "SKF 2205 E-2RS1TN9 measures 25 mm bore × 52 mm OD × 18 mm width (0.984 × 2.047 × 0.709 in), mass about 160 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2205 work?",
        "a": "The final two digits of 2205 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "How heavy is 2205-E-2RS1TN9?",
        "a": "Catalogue mass is 160 g for 2205 E-2RS1TN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2205-E-2RS1TN9 take?",
        "a": "Catalogue values for 2205 E-2RS1TN9: dynamic C 14.3 kN, static C0 4 kN, fatigue limit Pu 0.21 kN. Use C in life calculation and C0 for static checks at 25 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2205",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2205-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×18 mm envelope with catalogue ratings within 10 %; 2205 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2205-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope, but catalogue C/C0 differ between executions (14.3/4 kN vs 16.8/4.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2205-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope, but catalogue C/C0 differ between executions (14.3/4 kN vs 16.8/4.4 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2205-E-2RS1TN9",
      "2205 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2205-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2205 E-2RS1KTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 4,
    "fatigue_load_limit_kN": 0.21,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2205 carries code 05 = 25 mm (code × 5). Envelope 25×52×18 mm (0.984×2.047×0.709 in) with a 13.5 mm radial section height, C 14.3 kN, C0 4 kN and Pu 0.21 kN. SKF spells the sealed execution 2205 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 9000 r/min, catalogue mass 160 g.",
    "applications": [
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2205-E-2RS1KTN9 chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Mount 2205-E-2RS1KTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Do not wash 2205-E-2RS1KTN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "On a sleeve-mounted 2205-E-2RS1KTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The E-2RS1KTN9 suffix on 2205-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.21 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2205-E-2RS1KTN9?",
        "a": "SKF 2205 E-2RS1KTN9 measures 25 mm bore × 52 mm OD × 18 mm width (0.984 × 2.047 × 0.709 in), mass about 160 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2205 work?",
        "a": "The final two digits of 2205 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "Which fits should I use for 2205-E-2RS1KTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 52 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2205-E-2RS1KTN9?",
        "a": "Catalogue mass is 160 g for 2205 E-2RS1KTN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2205",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2205-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×18 mm envelope with catalogue ratings within 10 %; 2205 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2205-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope, but catalogue C/C0 differ between executions (14.3/4 kN vs 16.8/4.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2205-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope, but catalogue C/C0 differ between executions (14.3/4 kN vs 16.8/4.4 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2205-E-2RS1KTN9",
      "2205 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2205-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2205 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 16.8,
    "static_load_kN": 4.4,
    "fatigue_load_limit_kN": 0.23,
    "reference_speed_rpm": 26000,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2205 carries code 05 = 25 mm (code × 5). Envelope 25×52×18 mm (0.984×2.047×0.709 in) with a 13.5 mm radial section height, C 16.8 kN, C0 4.4 kN and Pu 0.23 kN. The open 2205 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 25 mm shaft. Reference (thermal) speed 26000 r/min, limiting speed 18000 r/min, catalogue mass 160 g.",
    "applications": [
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 2205-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Mount 2205-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The ETN9 suffix on 2205-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 18000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 2205-ETN9 (C 16.8 kN, C0 4.4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 2205-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.23 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2205-ETN9?",
        "a": "SKF 2205 ETN9 measures 25 mm bore × 52 mm OD × 18 mm width (0.984 × 2.047 × 0.709 in), mass about 160 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2205 work?",
        "a": "The final two digits of 2205 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "What load can 2205-ETN9 take?",
        "a": "Catalogue values for 2205 ETN9: dynamic C 16.8 kN, static C0 4.4 kN, fatigue limit Pu 0.23 kN. Use C in life calculation and C0 for static checks at 25 mm bore."
      },
      {
        "q": "What is the speed rating of 2205-ETN9?",
        "a": "SKF lists a 26000 r/min thermal reference speed and a 18000 r/min mechanical limiting speed for 2205 ETN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2205",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2205-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope, but catalogue C/C0 differ between executions (16.8/4.4 kN vs 14.3/4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2205-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope, but catalogue C/C0 differ between executions (16.8/4.4 kN vs 14.3/4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2205-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×18 mm envelope with catalogue ratings within 10 %; 2205 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2205-ETN9",
      "2205 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2205-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2205 EKTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 16.8,
    "static_load_kN": 4.4,
    "fatigue_load_limit_kN": 0.23,
    "reference_speed_rpm": 26000,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2205 carries code 05 = 25 mm (code × 5). Envelope 25×52×18 mm (0.984×2.047×0.709 in) with a 13.5 mm radial section height, C 16.8 kN, C0 4.4 kN and Pu 0.23 kN. The open 2205 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 26000 r/min, limiting speed 18000 r/min, catalogue mass 160 g.",
    "applications": [
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.23 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2205-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "On a sleeve-mounted 2205-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 2205-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 18000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2205-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 25 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2205-EKTN9?",
        "a": "SKF 2205 EKTN9 measures 25 mm bore × 52 mm OD × 18 mm width (0.984 × 2.047 × 0.709 in), mass about 160 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2205 work?",
        "a": "The final two digits of 2205 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "What is the speed rating of 2205-EKTN9?",
        "a": "SKF lists a 26000 r/min thermal reference speed and a 18000 r/min mechanical limiting speed for 2205 EKTN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 2205-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2205-EKTN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2205",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2205-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope, but catalogue C/C0 differ between executions (16.8/4.4 kN vs 14.3/4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2205-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope, but catalogue C/C0 differ between executions (16.8/4.4 kN vs 14.3/4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2205-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×18 mm envelope with catalogue ratings within 10 %; 2205 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2205-EKTN9",
      "2205 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1305-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1305 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19,
    "static_load_kN": 5.4,
    "fatigue_load_limit_kN": 0.28,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1305 carries code 05 = 25 mm (code × 5). Envelope 25×62×17 mm (0.984×2.441×0.669 in) with a 18.5 mm radial section height, C 19 kN, C0 5.4 kN and Pu 0.28 kN. The open 1305 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 25 mm shaft. Reference (thermal) speed 22000 r/min, limiting speed 15000 r/min, catalogue mass 260 g.",
    "applications": [
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 1305-ETN9 chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Mount 1305-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The ETN9 suffix on 1305-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 15000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 1305-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 1305-ETN9 chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1305-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1305-ETN9?",
        "a": "SKF 1305 ETN9 measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 260 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1305 work?",
        "a": "The final two digits of 1305 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "What load can 1305-ETN9 take?",
        "a": "Catalogue values for 1305 ETN9: dynamic C 19 kN, static C0 5.4 kN, fatigue limit Pu 0.28 kN. Use C in life calculation and C0 for static checks at 25 mm bore."
      },
      {
        "q": "What is the speed rating of 1305-ETN9?",
        "a": "SKF lists a 22000 r/min thermal reference speed and a 15000 r/min mechanical limiting speed for 1305 ETN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1305",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1305-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 1305 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1305-ETN9",
      "1305 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1305-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1305 EKTN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19,
    "static_load_kN": 5.4,
    "fatigue_load_limit_kN": 0.28,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1305 carries code 05 = 25 mm (code × 5). Envelope 25×62×17 mm (0.984×2.441×0.669 in) with a 18.5 mm radial section height, C 19 kN, C0 5.4 kN and Pu 0.28 kN. The open 1305 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 22000 r/min, limiting speed 15000 r/min, catalogue mass 260 g.",
    "applications": [
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1305-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1305-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "On a sleeve-mounted 1305-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 1305-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 15000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.28 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 25 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1305-EKTN9?",
        "a": "SKF 1305 EKTN9 measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 260 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1305 work?",
        "a": "The final two digits of 1305 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "What is the speed rating of 1305-EKTN9?",
        "a": "SKF lists a 22000 r/min thermal reference speed and a 15000 r/min mechanical limiting speed for 1305 EKTN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1305-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1305-EKTN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1305",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1305-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 1305 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1305-EKTN9",
      "1305 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2305-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2305 E-2RS1TN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19,
    "static_load_kN": 5.4,
    "fatigue_load_limit_kN": 0.28,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2305 carries code 05 = 25 mm (code × 5). Envelope 25×62×24 mm (0.984×2.441×0.945 in) with a 18.5 mm radial section height, C 19 kN, C0 5.4 kN and Pu 0.28 kN. SKF spells the sealed execution 2305 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 25 mm shaft. Limiting speed 7500 r/min, catalogue mass 340 g.",
    "applications": [
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 25 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Mount 2305-E-2RS1TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Do not wash 2305-E-2RS1TN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "The E-2RS1TN9 suffix on 2305-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 2305-E-2RS1TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.28 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2305-E-2RS1TN9?",
        "a": "SKF 2305 E-2RS1TN9 measures 25 mm bore × 62 mm OD × 24 mm width (0.984 × 2.441 × 0.945 in), mass about 340 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2305 work?",
        "a": "The final two digits of 2305 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "Which fits should I use for 2305-E-2RS1TN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 62 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2305-E-2RS1TN9?",
        "a": "Catalogue mass is 340 g for 2305 E-2RS1TN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2305",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×24 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2305-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×24 mm envelope with catalogue ratings within 10 %; 2305 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2305-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×24 mm envelope, but catalogue C/C0 differ between executions (19/5.4 kN vs 27/7.1 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2305-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×24 mm envelope, but catalogue C/C0 differ between executions (19/5.4 kN vs 27/7.1 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2305-E-2RS1TN9",
      "2305 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2305-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2305 E-2RS1KTN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19,
    "static_load_kN": 5.4,
    "fatigue_load_limit_kN": 0.28,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2305 carries code 05 = 25 mm (code × 5). Envelope 25×62×24 mm (0.984×2.441×0.945 in) with a 18.5 mm radial section height, C 19 kN, C0 5.4 kN and Pu 0.28 kN. SKF spells the sealed execution 2305 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 7500 r/min, catalogue mass 340 g.",
    "applications": [
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors",
      "small electric motors"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 2305-E-2RS1KTN9 (C 19 kN, C0 5.4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2305-E-2RS1KTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The 2RS1 contact seals on 2305-E-2RS1KTN9 add drag and cap speed at 7500 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The E-2RS1KTN9 suffix on 2305-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 25 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2305-E-2RS1KTN9?",
        "a": "SKF 2305 E-2RS1KTN9 measures 25 mm bore × 62 mm OD × 24 mm width (0.984 × 2.441 × 0.945 in), mass about 340 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2305 work?",
        "a": "The final two digits of 2305 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "Can 2305-E-2RS1KTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2305-E-2RS1KTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 62 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2305",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×24 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2305-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×24 mm envelope with catalogue ratings within 10 %; 2305 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2305-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×24 mm envelope, but catalogue C/C0 differ between executions (19/5.4 kN vs 27/7.1 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2305-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×24 mm envelope, but catalogue C/C0 differ between executions (19/5.4 kN vs 27/7.1 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2305-E-2RS1KTN9",
      "2305 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2305-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2305 ETN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 27,
    "static_load_kN": 7.1,
    "fatigue_load_limit_kN": 0.37,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 16000,
    "max_rpm": 16000,
    "weight_g": 340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2305 carries code 05 = 25 mm (code × 5). Envelope 25×62×24 mm (0.984×2.441×0.945 in) with a 18.5 mm radial section height, C 27 kN, C0 7.1 kN and Pu 0.37 kN. The open 2305 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 25 mm shaft. Reference (thermal) speed 22000 r/min, limiting speed 16000 r/min, catalogue mass 340 g.",
    "applications": [
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 2305-ETN9 (C 27 kN, C0 7.1 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The fatigue load limit is 0.37 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The ETN9 suffix on 2305-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 16000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 2305-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.37 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 25 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2305-ETN9?",
        "a": "SKF 2305 ETN9 measures 25 mm bore × 62 mm OD × 24 mm width (0.984 × 2.441 × 0.945 in), mass about 340 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2305 work?",
        "a": "The final two digits of 2305 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "How heavy is 2305-ETN9?",
        "a": "Catalogue mass is 340 g for 2305 ETN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2305-ETN9 take?",
        "a": "Catalogue values for 2305 ETN9: dynamic C 27 kN, static C0 7.1 kN, fatigue limit Pu 0.37 kN. Use C in life calculation and C0 for static checks at 25 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2305",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2305-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×24 mm envelope, but catalogue C/C0 differ between executions (27/7.1 kN vs 19/5.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2305-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×24 mm envelope, but catalogue C/C0 differ between executions (27/7.1 kN vs 19/5.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2305-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×24 mm envelope with catalogue ratings within 10 %; 2305 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2305-ETN9",
      "2305 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2305-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2305 EKTN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 27,
    "static_load_kN": 7.1,
    "fatigue_load_limit_kN": 0.37,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 16000,
    "max_rpm": 16000,
    "weight_g": 340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2305 carries code 05 = 25 mm (code × 5). Envelope 25×62×24 mm (0.984×2.441×0.945 in) with a 18.5 mm radial section height, C 27 kN, C0 7.1 kN and Pu 0.37 kN. The open 2305 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 22000 r/min, limiting speed 16000 r/min, catalogue mass 340 g.",
    "applications": [
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts",
      "woodworking machine spindles"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2305-EKTN9 chamfer so the 24 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "At 25 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The K suffix means a 1:12 tapered bore: 2305-EKTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The EKTN9 suffix on 2305-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 16000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 25 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 2305-EKTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2305-EKTN9?",
        "a": "SKF 2305 EKTN9 measures 25 mm bore × 62 mm OD × 24 mm width (0.984 × 2.441 × 0.945 in), mass about 340 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2305 work?",
        "a": "The final two digits of 2305 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "How much misalignment can 2305-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2305-EKTN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2305-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2305",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2305-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×24 mm envelope, but catalogue C/C0 differ between executions (27/7.1 kN vs 19/5.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2305-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×24 mm envelope, but catalogue C/C0 differ between executions (27/7.1 kN vs 19/5.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2305-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×24 mm envelope with catalogue ratings within 10 %; 2305 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2305-EKTN9",
      "2305 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1206-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1206 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 15.6,
    "static_load_kN": 4.65,
    "fatigue_load_limit_kN": 0.24,
    "reference_speed_rpm": 24000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 220,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1206 carries code 06 = 30 mm (code × 5). Envelope 30×62×16 mm (1.181×2.441×0.63 in) with a 16.0 mm radial section height, C 15.6 kN, C0 4.65 kN and Pu 0.24 kN. The open 1206 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 30 mm shaft. Reference (thermal) speed 24000 r/min, limiting speed 15000 r/min, catalogue mass 220 g.",
    "applications": [
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts",
      "woodworking machine spindles"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 30 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "At 30 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The ETN9 suffix on 1206-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 15000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.24 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 30 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 1206-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1206-ETN9?",
        "a": "SKF 1206 ETN9 measures 30 mm bore × 62 mm OD × 16 mm width (1.181 × 2.441 × 0.63 in), mass about 220 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1206 work?",
        "a": "The final two digits of 1206 are bore code 06, multiplied by 5 to give 30 mm."
      },
      {
        "q": "What load can 1206-ETN9 take?",
        "a": "Catalogue values for 1206 ETN9: dynamic C 15.6 kN, static C0 4.65 kN, fatigue limit Pu 0.24 kN. Use C in life calculation and C0 for static checks at 30 mm bore."
      },
      {
        "q": "What is the speed rating of 1206-ETN9?",
        "a": "SKF lists a 24000 r/min thermal reference speed and a 15000 r/min mechanical limiting speed for 1206 ETN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1206",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1206-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 1206 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11206-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 11206 TN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1206-ETN9",
      "1206 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1206-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1206 EKTN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 15.6,
    "static_load_kN": 4.65,
    "fatigue_load_limit_kN": 0.24,
    "reference_speed_rpm": 24000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 220,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1206 carries code 06 = 30 mm (code × 5). Envelope 30×62×16 mm (1.181×2.441×0.63 in) with a 16.0 mm radial section height, C 15.6 kN, C0 4.65 kN and Pu 0.24 kN. The open 1206 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 24000 r/min, limiting speed 15000 r/min, catalogue mass 220 g.",
    "applications": [
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 1206-EKTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Catalogue ratings for 1206-EKTN9 (C 15.6 kN, C0 4.65 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The K suffix means a 1:12 tapered bore: 1206-EKTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The EKTN9 suffix on 1206-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 15000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 1206-EKTN9 (C 15.6 kN, C0 4.65 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1206-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1206-EKTN9?",
        "a": "SKF 1206 EKTN9 measures 30 mm bore × 62 mm OD × 16 mm width (1.181 × 2.441 × 0.63 in), mass about 220 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1206 work?",
        "a": "The final two digits of 1206 are bore code 06, multiplied by 5 to give 30 mm."
      },
      {
        "q": "How heavy is 1206-EKTN9?",
        "a": "Catalogue mass is 220 g for 1206 EKTN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 1206-EKTN9 take?",
        "a": "Catalogue values for 1206 EKTN9: dynamic C 15.6 kN, static C0 4.65 kN, fatigue limit Pu 0.24 kN. Use C in life calculation and C0 for static checks at 30 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1206",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1206-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 1206 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11206-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 11206 TN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1206-EKTN9",
      "1206 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2206-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2206 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 15.6,
    "static_load_kN": 4.65,
    "fatigue_load_limit_kN": 0.24,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2206 carries code 06 = 30 mm (code × 5). Envelope 30×62×20 mm (1.181×2.441×0.787 in) with a 16.0 mm radial section height, C 15.6 kN, C0 4.65 kN and Pu 0.24 kN. SKF spells the sealed execution 2206 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 30 mm shaft. Limiting speed 7500 r/min, catalogue mass 260 g.",
    "applications": [
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts",
      "woodworking machine spindles"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2206-E-2RS1TN9 chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "At 30 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2206-E-2RS1TN9 to avoid seal-lip binding.",
      "The E-2RS1TN9 suffix on 2206-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 30 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2206-E-2RS1TN9 (C 15.6 kN, C0 4.65 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2206-E-2RS1TN9?",
        "a": "SKF 2206 E-2RS1TN9 measures 30 mm bore × 62 mm OD × 20 mm width (1.181 × 2.441 × 0.787 in), mass about 260 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2206 work?",
        "a": "The final two digits of 2206 are bore code 06, multiplied by 5 to give 30 mm."
      },
      {
        "q": "How much misalignment can 2206-E-2RS1TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2206-E-2RS1TN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2206-E-2RS1TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2206",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2206-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×20 mm envelope with catalogue ratings within 10 %; 2206 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2206-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope, but catalogue C/C0 differ between executions (15.6/4.65 kN vs 23.8/6.7 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2206-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope, but catalogue C/C0 differ between executions (15.6/4.65 kN vs 23.8/6.7 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2206-E-2RS1TN9",
      "2206 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2206-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2206 E-2RS1KTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 15.6,
    "static_load_kN": 4.65,
    "fatigue_load_limit_kN": 0.24,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2206 carries code 06 = 30 mm (code × 5). Envelope 30×62×20 mm (1.181×2.441×0.787 in) with a 16.0 mm radial section height, C 15.6 kN, C0 4.65 kN and Pu 0.24 kN. SKF spells the sealed execution 2206 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 7500 r/min, catalogue mass 260 g.",
    "applications": [
      "food-processing conveyors",
      "small electric motors",
      "conveyor idler rollers",
      "agricultural machinery shafts"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2206-E-2RS1KTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Catalogue ratings for 2206-E-2RS1KTN9 (C 15.6 kN, C0 4.65 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The 2RS1 contact seals on 2206-E-2RS1KTN9 add drag and cap speed at 7500 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The E-2RS1KTN9 suffix on 2206-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2206-E-2RS1KTN9 chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2206-E-2RS1KTN9?",
        "a": "SKF 2206 E-2RS1KTN9 measures 30 mm bore × 62 mm OD × 20 mm width (1.181 × 2.441 × 0.787 in), mass about 260 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2206 work?",
        "a": "The final two digits of 2206 are bore code 06, multiplied by 5 to give 30 mm."
      },
      {
        "q": "Can 2206-E-2RS1KTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2206-E-2RS1KTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 62 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2206",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2206-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×20 mm envelope with catalogue ratings within 10 %; 2206 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2206-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope, but catalogue C/C0 differ between executions (15.6/4.65 kN vs 23.8/6.7 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2206-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope, but catalogue C/C0 differ between executions (15.6/4.65 kN vs 23.8/6.7 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2206-E-2RS1KTN9",
      "2206 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2206-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2206 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 23.8,
    "static_load_kN": 6.7,
    "fatigue_load_limit_kN": 0.35,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2206 carries code 06 = 30 mm (code × 5). Envelope 30×62×20 mm (1.181×2.441×0.787 in) with a 16.0 mm radial section height, C 23.8 kN, C0 6.7 kN and Pu 0.35 kN. The open 2206 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 30 mm shaft. Reference (thermal) speed 22000 r/min, limiting speed 15000 r/min, catalogue mass 260 g.",
    "applications": [
      "textile spindles and looms",
      "fan and blower shafts",
      "woodworking machine spindles",
      "light gearbox layshafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2206-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The spherical outer raceway lets 2206-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The ETN9 suffix on 2206-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 15000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 30 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2206-ETN9 (C 23.8 kN, C0 6.7 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 2206-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2206-ETN9?",
        "a": "SKF 2206 ETN9 measures 30 mm bore × 62 mm OD × 20 mm width (1.181 × 2.441 × 0.787 in), mass about 260 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2206 work?",
        "a": "The final two digits of 2206 are bore code 06, multiplied by 5 to give 30 mm."
      },
      {
        "q": "What is the speed rating of 2206-ETN9?",
        "a": "SKF lists a 22000 r/min thermal reference speed and a 15000 r/min mechanical limiting speed for 2206 ETN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 2206-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2206-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2206",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2206-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope, but catalogue C/C0 differ between executions (23.8/6.7 kN vs 15.6/4.65 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2206-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope, but catalogue C/C0 differ between executions (23.8/6.7 kN vs 15.6/4.65 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2206-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×20 mm envelope with catalogue ratings within 10 %; 2206 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2206-ETN9",
      "2206 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2206-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2206 EKTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 23.8,
    "static_load_kN": 6.7,
    "fatigue_load_limit_kN": 0.35,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2206 carries code 06 = 30 mm (code × 5). Envelope 30×62×20 mm (1.181×2.441×0.787 in) with a 16.0 mm radial section height, C 23.8 kN, C0 6.7 kN and Pu 0.35 kN. The open 2206 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 22000 r/min, limiting speed 15000 r/min, catalogue mass 260 g.",
    "applications": [
      "fan and blower shafts",
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 30 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Fillet radii must clear the 2206-EKTN9 chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The EKTN9 suffix on 2206-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 15000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 2206-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.35 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2206-EKTN9?",
        "a": "SKF 2206 EKTN9 measures 30 mm bore × 62 mm OD × 20 mm width (1.181 × 2.441 × 0.787 in), mass about 260 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2206 work?",
        "a": "The final two digits of 2206 are bore code 06, multiplied by 5 to give 30 mm."
      },
      {
        "q": "What load can 2206-EKTN9 take?",
        "a": "Catalogue values for 2206 EKTN9: dynamic C 23.8 kN, static C0 6.7 kN, fatigue limit Pu 0.35 kN. Use C in life calculation and C0 for static checks at 30 mm bore."
      },
      {
        "q": "What is the speed rating of 2206-EKTN9?",
        "a": "SKF lists a 22000 r/min thermal reference speed and a 15000 r/min mechanical limiting speed for 2206 EKTN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2206",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2206-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope, but catalogue C/C0 differ between executions (23.8/6.7 kN vs 15.6/4.65 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2206-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope, but catalogue C/C0 differ between executions (23.8/6.7 kN vs 15.6/4.65 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2206-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×20 mm envelope with catalogue ratings within 10 %; 2206 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2206-EKTN9",
      "2206 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1306-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1306 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.5,
    "static_load_kN": 6.8,
    "fatigue_load_limit_kN": 0.36,
    "reference_speed_rpm": 19000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 390,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1306 carries code 06 = 30 mm (code × 5). Envelope 30×72×19 mm (1.181×2.835×0.748 in) with a 21.0 mm radial section height, C 22.5 kN, C0 6.8 kN and Pu 0.36 kN. The open 1306 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 30 mm shaft. Reference (thermal) speed 19000 r/min, limiting speed 13000 r/min, catalogue mass 390 g.",
    "applications": [
      "textile spindles and looms",
      "fan and blower shafts",
      "woodworking machine spindles",
      "light gearbox layshafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.36 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The spherical outer raceway lets 1306-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The ETN9 suffix on 1306-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 13000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 30 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 1306-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 1306-ETN9 chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1306-ETN9?",
        "a": "SKF 1306 ETN9 measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 390 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1306 work?",
        "a": "The final two digits of 1306 are bore code 06, multiplied by 5 to give 30 mm."
      },
      {
        "q": "How heavy is 1306-ETN9?",
        "a": "Catalogue mass is 390 g for 1306 ETN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 1306-ETN9 take?",
        "a": "Catalogue values for 1306 ETN9: dynamic C 22.5 kN, static C0 6.8 kN, fatigue limit Pu 0.36 kN. Use C in life calculation and C0 for static checks at 30 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1306",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1306-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 1306 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1306-ETN9",
      "1306 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1306-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1306 EKTN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.5,
    "static_load_kN": 6.8,
    "fatigue_load_limit_kN": 0.36,
    "reference_speed_rpm": 19000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 390,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1306 carries code 06 = 30 mm (code × 5). Envelope 30×72×19 mm (1.181×2.835×0.748 in) with a 21.0 mm radial section height, C 22.5 kN, C0 6.8 kN and Pu 0.36 kN. The open 1306 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 19000 r/min, limiting speed 13000 r/min, catalogue mass 390 g.",
    "applications": [
      "fan and blower shafts",
      "woodworking machine spindles",
      "light gearbox layshafts",
      "food-processing conveyors"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 30 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the 1306-EKTN9 chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The K suffix means a 1:12 tapered bore: 1306-EKTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The EKTN9 suffix on 1306-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 13000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 1306-EKTN9 chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1306-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1306-EKTN9?",
        "a": "SKF 1306 EKTN9 measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 390 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1306 work?",
        "a": "The final two digits of 1306 are bore code 06, multiplied by 5 to give 30 mm."
      },
      {
        "q": "How much misalignment can 1306-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1306-EKTN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 1306-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1306",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1306-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 1306 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1306-EKTN9",
      "1306 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2306-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2306 E-2RS1TN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.5,
    "static_load_kN": 6.8,
    "fatigue_load_limit_kN": 0.36,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2306 carries code 06 = 30 mm (code × 5). Envelope 30×72×27 mm (1.181×2.835×1.063 in) with a 21.0 mm radial section height, C 22.5 kN, C0 6.8 kN and Pu 0.36 kN. SKF spells the sealed execution 2306 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 30 mm shaft. Limiting speed 6700 r/min, catalogue mass 510 g.",
    "applications": [
      "conveyor idler rollers",
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2306-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The fatigue load limit is 0.36 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2306-E-2RS1TN9 to avoid seal-lip binding.",
      "The E-2RS1TN9 suffix on 2306-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6700 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2306-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 30 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2306-E-2RS1TN9?",
        "a": "SKF 2306 E-2RS1TN9 measures 30 mm bore × 72 mm OD × 27 mm width (1.181 × 2.835 × 1.063 in), mass about 510 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2306 work?",
        "a": "The final two digits of 2306 are bore code 06, multiplied by 5 to give 30 mm."
      },
      {
        "q": "How heavy is 2306-E-2RS1TN9?",
        "a": "Catalogue mass is 510 g for 2306 E-2RS1TN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2306-E-2RS1TN9 take?",
        "a": "Catalogue values for 2306 E-2RS1TN9: dynamic C 22.5 kN, static C0 6.8 kN, fatigue limit Pu 0.36 kN. Use C in life calculation and C0 for static checks at 30 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2306",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×27 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2306-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×27 mm envelope with catalogue ratings within 10 %; 2306 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2306-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×27 mm envelope, but catalogue C/C0 differ between executions (22.5/6.8 kN vs 31.2/8.8 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2306-E-2RS1TN9",
      "2306 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2306-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2306 E-2RS1KTN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.5,
    "static_load_kN": 6.8,
    "fatigue_load_limit_kN": 0.36,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2306 carries code 06 = 30 mm (code × 5). Envelope 30×72×27 mm (1.181×2.835×1.063 in) with a 21.0 mm radial section height, C 22.5 kN, C0 6.8 kN and Pu 0.36 kN. SKF spells the sealed execution 2306 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 6700 r/min, catalogue mass 510 g.",
    "applications": [
      "agricultural machinery shafts",
      "textile spindles and looms",
      "fan and blower shafts",
      "woodworking machine spindles"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 30 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "At 30 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The 2RS1 contact seals on 2306-E-2RS1KTN9 add drag and cap speed at 6700 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The E-2RS1KTN9 suffix on 2306-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6700 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 2306-E-2RS1KTN9 (C 22.5 kN, C0 6.8 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2306-E-2RS1KTN9?",
        "a": "SKF 2306 E-2RS1KTN9 measures 30 mm bore × 72 mm OD × 27 mm width (1.181 × 2.835 × 1.063 in), mass about 510 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2306 work?",
        "a": "The final two digits of 2306 are bore code 06, multiplied by 5 to give 30 mm."
      },
      {
        "q": "What load can 2306-E-2RS1KTN9 take?",
        "a": "Catalogue values for 2306 E-2RS1KTN9: dynamic C 22.5 kN, static C0 6.8 kN, fatigue limit Pu 0.36 kN. Use C in life calculation and C0 for static checks at 30 mm bore."
      },
      {
        "q": "What is the speed rating of 2306-E-2RS1KTN9?",
        "a": "SKF publishes only the 6700 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2306",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×27 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2306-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×27 mm envelope with catalogue ratings within 10 %; 2306 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2306-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×27 mm envelope, but catalogue C/C0 differ between executions (22.5/6.8 kN vs 31.2/8.8 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2306-E-2RS1KTN9",
      "2306 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2306-K",
    "brand": "SKF",
    "manufacturer_designation": "2306 K",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 31.2,
    "static_load_kN": 8.8,
    "fatigue_load_limit_kN": 0.45,
    "reference_speed_rpm": 18000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2306 carries code 06 = 30 mm (code × 5). Envelope 30×72×27 mm (1.181×2.835×1.063 in) with a 21.0 mm radial section height, C 31.2 kN, C0 8.8 kN and Pu 0.45 kN. The open 2306 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 18000 r/min, limiting speed 13000 r/min, catalogue mass 500 g.",
    "applications": [
      "textile spindles and looms",
      "fan and blower shafts",
      "woodworking machine spindles",
      "light gearbox layshafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2306-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The spherical outer raceway lets 2306-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "On a sleeve-mounted 2306-K, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The  suffix on 2306-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 13000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 2306-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2306-K chamfer so the 27 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2306-K?",
        "a": "SKF 2306 K measures 30 mm bore × 72 mm OD × 27 mm width (1.181 × 2.835 × 1.063 in), mass about 500 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2306 work?",
        "a": "The final two digits of 2306 are bore code 06, multiplied by 5 to give 30 mm."
      },
      {
        "q": "What is the speed rating of 2306-K?",
        "a": "SKF lists a 18000 r/min thermal reference speed and a 13000 r/min mechanical limiting speed for 2306 K; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 2306-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2306-K allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2306",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2306-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×27 mm envelope, but catalogue C/C0 differ between executions (31.2/8.8 kN vs 22.5/6.8 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2306-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×27 mm envelope, but catalogue C/C0 differ between executions (31.2/8.8 kN vs 22.5/6.8 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2306-K",
      "2306 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1207-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1207 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19,
    "static_load_kN": 6,
    "fatigue_load_limit_kN": 0.31,
    "reference_speed_rpm": 20000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 320,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1207 carries code 07 = 35 mm (code × 5). Envelope 35×72×17 mm (1.378×2.835×0.669 in) with a 18.5 mm radial section height, C 19 kN, C0 6 kN and Pu 0.31 kN. The open 1207 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 35 mm shaft. Reference (thermal) speed 20000 r/min, limiting speed 13000 r/min, catalogue mass 320 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.31 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The spherical outer raceway lets 1207-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The ETN9 suffix on 1207-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 13000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 1207-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 1207-ETN9 chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1207-ETN9?",
        "a": "SKF 1207 ETN9 measures 35 mm bore × 72 mm OD × 17 mm width (1.378 × 2.835 × 0.669 in), mass about 320 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1207 work?",
        "a": "The final two digits of 1207 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "How heavy is 1207-ETN9?",
        "a": "Catalogue mass is 320 g for 1207 ETN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 1207-ETN9 take?",
        "a": "Catalogue values for 1207 ETN9: dynamic C 19 kN, static C0 6 kN, fatigue limit Pu 0.31 kN. Use C in life calculation and C0 for static checks at 35 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1207",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1207-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 1207 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11207-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 11207 TN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1207-ETN9",
      "1207 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1207-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1207 EKTN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19,
    "static_load_kN": 6,
    "fatigue_load_limit_kN": 0.31,
    "reference_speed_rpm": 20000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 320,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1207 carries code 07 = 35 mm (code × 5). Envelope 35×72×17 mm (1.378×2.835×0.669 in) with a 18.5 mm radial section height, C 19 kN, C0 6 kN and Pu 0.31 kN. The open 1207 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 20000 r/min, limiting speed 13000 r/min, catalogue mass 320 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 35 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the 1207-EKTN9 chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "On a sleeve-mounted 1207-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 1207-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 13000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 1207-EKTN9 chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1207-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1207-EKTN9?",
        "a": "SKF 1207 EKTN9 measures 35 mm bore × 72 mm OD × 17 mm width (1.378 × 2.835 × 0.669 in), mass about 320 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1207 work?",
        "a": "The final two digits of 1207 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "Which fits should I use for 1207-EKTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 72 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 1207-EKTN9?",
        "a": "Catalogue mass is 320 g for 1207 EKTN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1207",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1207-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 1207 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11207-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 11207 TN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1207-EKTN9",
      "1207 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2207-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2207 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19,
    "static_load_kN": 6,
    "fatigue_load_limit_kN": 0.31,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 410,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2207 carries code 07 = 35 mm (code × 5). Envelope 35×72×23 mm (1.378×2.835×0.906 in) with a 18.5 mm radial section height, C 19 kN, C0 6 kN and Pu 0.31 kN. SKF spells the sealed execution 2207 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 35 mm shaft. Limiting speed 6300 r/min, catalogue mass 410 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2207-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The fatigue load limit is 0.31 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2207-E-2RS1TN9 to avoid seal-lip binding.",
      "The E-2RS1TN9 suffix on 2207-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2207-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 35 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2207-E-2RS1TN9?",
        "a": "SKF 2207 E-2RS1TN9 measures 35 mm bore × 72 mm OD × 23 mm width (1.378 × 2.835 × 0.906 in), mass about 410 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2207 work?",
        "a": "The final two digits of 2207 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "How heavy is 2207-E-2RS1TN9?",
        "a": "Catalogue mass is 410 g for 2207 E-2RS1TN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2207-E-2RS1TN9 take?",
        "a": "Catalogue values for 2207 E-2RS1TN9: dynamic C 19 kN, static C0 6 kN, fatigue limit Pu 0.31 kN. Use C in life calculation and C0 for static checks at 35 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2207",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2207-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×23 mm envelope with catalogue ratings within 10 %; 2207 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2207-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope, but catalogue C/C0 differ between executions (19/6 kN vs 30.2/8.8 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2207-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope, but catalogue C/C0 differ between executions (19/6 kN vs 30.2/8.8 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2207-E-2RS1TN9",
      "2207 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2207-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2207 E-2RS1KTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19,
    "static_load_kN": 6,
    "fatigue_load_limit_kN": 0.31,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 410,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2207 carries code 07 = 35 mm (code × 5). Envelope 35×72×23 mm (1.378×2.835×0.906 in) with a 18.5 mm radial section height, C 19 kN, C0 6 kN and Pu 0.31 kN. SKF spells the sealed execution 2207 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 6300 r/min, catalogue mass 410 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The 2RS1 contact seals on 2207-E-2RS1KTN9 add drag and cap speed at 6300 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The E-2RS1KTN9 suffix on 2207-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 2207-E-2RS1KTN9 (C 19 kN, C0 6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2207-E-2RS1KTN9?",
        "a": "SKF 2207 E-2RS1KTN9 measures 35 mm bore × 72 mm OD × 23 mm width (1.378 × 2.835 × 0.906 in), mass about 410 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2207 work?",
        "a": "The final two digits of 2207 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "What load can 2207-E-2RS1KTN9 take?",
        "a": "Catalogue values for 2207 E-2RS1KTN9: dynamic C 19 kN, static C0 6 kN, fatigue limit Pu 0.31 kN. Use C in life calculation and C0 for static checks at 35 mm bore."
      },
      {
        "q": "What is the speed rating of 2207-E-2RS1KTN9?",
        "a": "SKF publishes only the 6300 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2207",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2207-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×23 mm envelope with catalogue ratings within 10 %; 2207 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2207-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope, but catalogue C/C0 differ between executions (19/6 kN vs 30.2/8.8 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2207-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope, but catalogue C/C0 differ between executions (19/6 kN vs 30.2/8.8 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2207-E-2RS1KTN9",
      "2207 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2207-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2207 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 30.2,
    "static_load_kN": 8.8,
    "fatigue_load_limit_kN": 0.455,
    "reference_speed_rpm": 18000,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2207 carries code 07 = 35 mm (code × 5). Envelope 35×72×23 mm (1.378×2.835×0.906 in) with a 18.5 mm radial section height, C 30.2 kN, C0 8.8 kN and Pu 0.455 kN. The open 2207 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 35 mm shaft. Reference (thermal) speed 18000 r/min, limiting speed 12000 r/min, catalogue mass 400 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 35 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The ETN9 suffix on 2207-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 12000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2207-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 35 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2207-ETN9 (C 30.2 kN, C0 8.8 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2207-ETN9?",
        "a": "SKF 2207 ETN9 measures 35 mm bore × 72 mm OD × 23 mm width (1.378 × 2.835 × 0.906 in), mass about 400 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2207 work?",
        "a": "The final two digits of 2207 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "What load can 2207-ETN9 take?",
        "a": "Catalogue values for 2207 ETN9: dynamic C 30.2 kN, static C0 8.8 kN, fatigue limit Pu 0.455 kN. Use C in life calculation and C0 for static checks at 35 mm bore."
      },
      {
        "q": "What is the speed rating of 2207-ETN9?",
        "a": "SKF lists a 18000 r/min thermal reference speed and a 12000 r/min mechanical limiting speed for 2207 ETN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2207",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2207-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope, but catalogue C/C0 differ between executions (30.2/8.8 kN vs 19/6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2207-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope, but catalogue C/C0 differ between executions (30.2/8.8 kN vs 19/6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2207-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×23 mm envelope with catalogue ratings within 10 %; 2207 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2207-ETN9",
      "2207 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2207-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2207 EKTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 30.2,
    "static_load_kN": 8.8,
    "fatigue_load_limit_kN": 0.455,
    "reference_speed_rpm": 18000,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2207 carries code 07 = 35 mm (code × 5). Envelope 35×72×23 mm (1.378×2.835×0.906 in) with a 18.5 mm radial section height, C 30.2 kN, C0 8.8 kN and Pu 0.455 kN. The open 2207 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 18000 r/min, limiting speed 12000 r/min, catalogue mass 400 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 2207-EKTN9 (C 30.2 kN, C0 8.8 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Catalogue ratings for 2207-EKTN9 (C 30.2 kN, C0 8.8 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "On a sleeve-mounted 2207-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 2207-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 12000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 2207-EKTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2207-EKTN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2207-EKTN9?",
        "a": "SKF 2207 EKTN9 measures 35 mm bore × 72 mm OD × 23 mm width (1.378 × 2.835 × 0.906 in), mass about 400 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2207 work?",
        "a": "The final two digits of 2207 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "What is the speed rating of 2207-EKTN9?",
        "a": "SKF lists a 18000 r/min thermal reference speed and a 12000 r/min mechanical limiting speed for 2207 EKTN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 2207-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2207-EKTN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2207",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2207-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope, but catalogue C/C0 differ between executions (30.2/8.8 kN vs 19/6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2207-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope, but catalogue C/C0 differ between executions (30.2/8.8 kN vs 19/6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2207-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×23 mm envelope with catalogue ratings within 10 %; 2207 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2207-EKTN9",
      "2207 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1307-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1307 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 8.5,
    "fatigue_load_limit_kN": 0.43,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1307 carries code 07 = 35 mm (code × 5). Envelope 35×80×21 mm (1.378×3.15×0.827 in) with a 22.5 mm radial section height, C 26.5 kN, C0 8.5 kN and Pu 0.43 kN. The open 1307 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 35 mm shaft. Reference (thermal) speed 16000 r/min, limiting speed 11000 r/min, catalogue mass 510 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The ETN9 suffix on 1307-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 11000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.43 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 1307-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1307-ETN9?",
        "a": "SKF 1307 ETN9 measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 510 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1307 work?",
        "a": "The final two digits of 1307 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "What load can 1307-ETN9 take?",
        "a": "Catalogue values for 1307 ETN9: dynamic C 26.5 kN, static C0 8.5 kN, fatigue limit Pu 0.43 kN. Use C in life calculation and C0 for static checks at 35 mm bore."
      },
      {
        "q": "What is the speed rating of 1307-ETN9?",
        "a": "SKF lists a 16000 r/min thermal reference speed and a 11000 r/min mechanical limiting speed for 1307 ETN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1307",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1307-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 1307 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1307-ETN9",
      "1307 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1307-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1307 EKTN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 8.5,
    "fatigue_load_limit_kN": 0.43,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1307 carries code 07 = 35 mm (code × 5). Envelope 35×80×21 mm (1.378×3.15×0.827 in) with a 22.5 mm radial section height, C 26.5 kN, C0 8.5 kN and Pu 0.43 kN. The open 1307 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 16000 r/min, limiting speed 11000 r/min, catalogue mass 510 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 1307-EKTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Catalogue ratings for 1307-EKTN9 (C 26.5 kN, C0 8.5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "On a sleeve-mounted 1307-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 1307-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 11000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 1307-EKTN9 (C 26.5 kN, C0 8.5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1307-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1307-EKTN9?",
        "a": "SKF 1307 EKTN9 measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 510 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1307 work?",
        "a": "The final two digits of 1307 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "What is the speed rating of 1307-EKTN9?",
        "a": "SKF lists a 16000 r/min thermal reference speed and a 11000 r/min mechanical limiting speed for 1307 EKTN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1307-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1307-EKTN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1307",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1307-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 1307 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1307-EKTN9",
      "1307 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2307-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2307 E-2RS1TN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 8.5,
    "fatigue_load_limit_kN": 0.43,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2307 carries code 07 = 35 mm (code × 5). Envelope 35×80×31 mm (1.378×3.15×1.22 in) with a 22.5 mm radial section height, C 26.5 kN, C0 8.5 kN and Pu 0.43 kN. SKF spells the sealed execution 2307 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 35 mm shaft. Limiting speed 5600 r/min, catalogue mass 700 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2307-E-2RS1TN9 chamfer so the 31 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Do not wash 2307-E-2RS1TN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "The E-2RS1TN9 suffix on 2307-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5600 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 35 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2307-E-2RS1TN9 (C 26.5 kN, C0 8.5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2307-E-2RS1TN9?",
        "a": "SKF 2307 E-2RS1TN9 measures 35 mm bore × 80 mm OD × 31 mm width (1.378 × 3.15 × 1.22 in), mass about 700 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2307 work?",
        "a": "The final two digits of 2307 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "Which fits should I use for 2307-E-2RS1TN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 80 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2307-E-2RS1TN9?",
        "a": "Catalogue mass is 700 g for 2307 E-2RS1TN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2307",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×31 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2307-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×31 mm envelope with catalogue ratings within 10 %; 2307 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2307-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×31 mm envelope, but catalogue C/C0 differ between executions (26.5/8.5 kN vs 39.7/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2307-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×31 mm envelope, but catalogue C/C0 differ between executions (26.5/8.5 kN vs 39.7/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2307-E-2RS1TN9",
      "2307 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2307-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2307 E-2RS1KTN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 8.5,
    "fatigue_load_limit_kN": 0.43,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2307 carries code 07 = 35 mm (code × 5). Envelope 35×80×31 mm (1.378×3.15×1.22 in) with a 22.5 mm radial section height, C 26.5 kN, C0 8.5 kN and Pu 0.43 kN. SKF spells the sealed execution 2307 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 5600 r/min, catalogue mass 700 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2307-E-2RS1KTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Catalogue ratings for 2307-E-2RS1KTN9 (C 26.5 kN, C0 8.5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Do not wash 2307-E-2RS1KTN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "On a sleeve-mounted 2307-E-2RS1KTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The E-2RS1KTN9 suffix on 2307-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5600 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2307-E-2RS1KTN9 chamfer so the 31 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2307-E-2RS1KTN9?",
        "a": "SKF 2307 E-2RS1KTN9 measures 35 mm bore × 80 mm OD × 31 mm width (1.378 × 3.15 × 1.22 in), mass about 700 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2307 work?",
        "a": "The final two digits of 2307 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "What is the speed rating of 2307-E-2RS1KTN9?",
        "a": "SKF publishes only the 5600 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      },
      {
        "q": "How much misalignment can 2307-E-2RS1KTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2307-E-2RS1KTN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2307",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×31 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2307-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×31 mm envelope with catalogue ratings within 10 %; 2307 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2307-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×31 mm envelope, but catalogue C/C0 differ between executions (26.5/8.5 kN vs 39.7/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2307-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×31 mm envelope, but catalogue C/C0 differ between executions (26.5/8.5 kN vs 39.7/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2307-E-2RS1KTN9",
      "2307 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2307-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2307 ETN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39.7,
    "static_load_kN": 11.2,
    "fatigue_load_limit_kN": 0.59,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2307 carries code 07 = 35 mm (code × 5). Envelope 35×80×31 mm (1.378×3.15×1.22 in) with a 22.5 mm radial section height, C 39.7 kN, C0 11.2 kN and Pu 0.59 kN. The open 2307 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 35 mm shaft. Reference (thermal) speed 16000 r/min, limiting speed 12000 r/min, catalogue mass 680 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2307-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The spherical outer raceway lets 2307-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The ETN9 suffix on 2307-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 12000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 35 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2307-ETN9 (C 39.7 kN, C0 11.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 2307-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2307-ETN9?",
        "a": "SKF 2307 ETN9 measures 35 mm bore × 80 mm OD × 31 mm width (1.378 × 3.15 × 1.22 in), mass about 680 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2307 work?",
        "a": "The final two digits of 2307 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "What is the speed rating of 2307-ETN9?",
        "a": "SKF lists a 16000 r/min thermal reference speed and a 12000 r/min mechanical limiting speed for 2307 ETN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 2307-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2307-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2307",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2307-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×31 mm envelope, but catalogue C/C0 differ between executions (39.7/11.2 kN vs 26.5/8.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2307-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×31 mm envelope, but catalogue C/C0 differ between executions (39.7/11.2 kN vs 26.5/8.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2307-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×31 mm envelope with catalogue ratings within 10 %; 2307 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2307-ETN9",
      "2307 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2307-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2307 EKTN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39.7,
    "static_load_kN": 11.2,
    "fatigue_load_limit_kN": 0.59,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2307 carries code 07 = 35 mm (code × 5). Envelope 35×80×31 mm (1.378×3.15×1.22 in) with a 22.5 mm radial section height, C 39.7 kN, C0 11.2 kN and Pu 0.59 kN. The open 2307 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 16000 r/min, limiting speed 12000 r/min, catalogue mass 680 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 35 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Fillet radii must clear the 2307-EKTN9 chamfer so the 31 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The K suffix means a 1:12 tapered bore: 2307-EKTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The EKTN9 suffix on 2307-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 12000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 2307-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.59 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2307-EKTN9?",
        "a": "SKF 2307 EKTN9 measures 35 mm bore × 80 mm OD × 31 mm width (1.378 × 3.15 × 1.22 in), mass about 680 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2307 work?",
        "a": "The final two digits of 2307 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "How much misalignment can 2307-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2307-EKTN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2307-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2307",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2307-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×31 mm envelope, but catalogue C/C0 differ between executions (39.7/11.2 kN vs 26.5/8.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2307-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×31 mm envelope, but catalogue C/C0 differ between executions (39.7/11.2 kN vs 26.5/8.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2307-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×31 mm envelope with catalogue ratings within 10 %; 2307 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2307-EKTN9",
      "2307 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1208-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1208 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19.9,
    "static_load_kN": 6.95,
    "fatigue_load_limit_kN": 0.36,
    "reference_speed_rpm": 18000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1208 carries code 08 = 40 mm (code × 5). Envelope 40×80×18 mm (1.575×3.15×0.709 in) with a 20.0 mm radial section height, C 19.9 kN, C0 6.95 kN and Pu 0.36 kN. The open 1208 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 40 mm shaft. Reference (thermal) speed 18000 r/min, limiting speed 11000 r/min, catalogue mass 420 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 1208-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Fillet radii must clear the 1208-ETN9 chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The ETN9 suffix on 1208-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 11000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 1208-ETN9 (C 19.9 kN, C0 6.95 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1208-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.36 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1208-ETN9?",
        "a": "SKF 1208 ETN9 measures 40 mm bore × 80 mm OD × 18 mm width (1.575 × 3.15 × 0.709 in), mass about 420 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1208 work?",
        "a": "The final two digits of 1208 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "Which fits should I use for 1208-ETN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 80 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 1208-ETN9?",
        "a": "Catalogue mass is 420 g for 1208 ETN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1208",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1208-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 1208 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11208-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 11208 TN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1208-ETN9",
      "1208 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1208-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1208 EKTN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19.9,
    "static_load_kN": 6.95,
    "fatigue_load_limit_kN": 0.36,
    "reference_speed_rpm": 18000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1208 carries code 08 = 40 mm (code × 5). Envelope 40×80×18 mm (1.575×3.15×0.709 in) with a 20.0 mm radial section height, C 19.9 kN, C0 6.95 kN and Pu 0.36 kN. The open 1208 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 18000 r/min, limiting speed 11000 r/min, catalogue mass 420 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.36 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The fatigue load limit is 0.36 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The K suffix means a 1:12 tapered bore: 1208-EKTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The EKTN9 suffix on 1208-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 11000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1208-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 40 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1208-EKTN9?",
        "a": "SKF 1208 EKTN9 measures 40 mm bore × 80 mm OD × 18 mm width (1.575 × 3.15 × 0.709 in), mass about 420 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1208 work?",
        "a": "The final two digits of 1208 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "How heavy is 1208-EKTN9?",
        "a": "Catalogue mass is 420 g for 1208 EKTN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 1208-EKTN9 take?",
        "a": "Catalogue values for 1208 EKTN9: dynamic C 19.9 kN, static C0 6.95 kN, fatigue limit Pu 0.36 kN. Use C in life calculation and C0 for static checks at 40 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1208",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1208-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 1208 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11208-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 11208 TN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1208-EKTN9",
      "1208 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2208-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2208 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19.9,
    "static_load_kN": 6.95,
    "fatigue_load_limit_kN": 0.36,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2208 carries code 08 = 40 mm (code × 5). Envelope 40×80×23 mm (1.575×3.15×0.906 in) with a 20.0 mm radial section height, C 19.9 kN, C0 6.95 kN and Pu 0.36 kN. SKF spells the sealed execution 2208 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 40 mm shaft. Limiting speed 5600 r/min, catalogue mass 500 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 40 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Fillet radii must clear the 2208-E-2RS1TN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2208-E-2RS1TN9 to avoid seal-lip binding.",
      "The E-2RS1TN9 suffix on 2208-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5600 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2208-E-2RS1TN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2208-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2208-E-2RS1TN9?",
        "a": "SKF 2208 E-2RS1TN9 measures 40 mm bore × 80 mm OD × 23 mm width (1.575 × 3.15 × 0.906 in), mass about 500 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2208 work?",
        "a": "The final two digits of 2208 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "How much misalignment can 2208-E-2RS1TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2208-E-2RS1TN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2208-E-2RS1TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2208",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2208-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×23 mm envelope with catalogue ratings within 10 %; 2208 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2208-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope, but catalogue C/C0 differ between executions (19.9/6.95 kN vs 31.9/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2208-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope, but catalogue C/C0 differ between executions (19.9/6.95 kN vs 31.9/10 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2208-E-2RS1TN9",
      "2208 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2208-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2208 E-2RS1KTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19.9,
    "static_load_kN": 6.95,
    "fatigue_load_limit_kN": 0.36,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2208 carries code 08 = 40 mm (code × 5). Envelope 40×80×23 mm (1.575×3.15×0.906 in) with a 20.0 mm radial section height, C 19.9 kN, C0 6.95 kN and Pu 0.36 kN. SKF spells the sealed execution 2208 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 5600 r/min, catalogue mass 500 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2208-E-2RS1KTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The fatigue load limit is 0.36 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Do not wash 2208-E-2RS1KTN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "On a sleeve-mounted 2208-E-2RS1KTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The E-2RS1KTN9 suffix on 2208-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5600 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 40 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2208-E-2RS1KTN9?",
        "a": "SKF 2208 E-2RS1KTN9 measures 40 mm bore × 80 mm OD × 23 mm width (1.575 × 3.15 × 0.906 in), mass about 500 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2208 work?",
        "a": "The final two digits of 2208 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "What is the speed rating of 2208-E-2RS1KTN9?",
        "a": "SKF publishes only the 5600 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      },
      {
        "q": "How much misalignment can 2208-E-2RS1KTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2208-E-2RS1KTN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2208",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2208-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×23 mm envelope with catalogue ratings within 10 %; 2208 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2208-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope, but catalogue C/C0 differ between executions (19.9/6.95 kN vs 31.9/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2208-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope, but catalogue C/C0 differ between executions (19.9/6.95 kN vs 31.9/10 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2208-E-2RS1KTN9",
      "2208 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2208-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2208 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 31.9,
    "static_load_kN": 10,
    "fatigue_load_limit_kN": 0.51,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2208 carries code 08 = 40 mm (code × 5). Envelope 40×80×23 mm (1.575×3.15×0.906 in) with a 20.0 mm radial section height, C 31.9 kN, C0 10 kN and Pu 0.51 kN. The open 2208 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 40 mm shaft. Reference (thermal) speed 16000 r/min, limiting speed 11000 r/min, catalogue mass 510 g.",
    "applications": [
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2208-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2208-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The ETN9 suffix on 2208-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 11000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2208-ETN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2208-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 40 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2208-ETN9?",
        "a": "SKF 2208 ETN9 measures 40 mm bore × 80 mm OD × 23 mm width (1.575 × 3.15 × 0.906 in), mass about 510 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2208 work?",
        "a": "The final two digits of 2208 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "How heavy is 2208-ETN9?",
        "a": "Catalogue mass is 510 g for 2208 ETN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2208-ETN9 take?",
        "a": "Catalogue values for 2208 ETN9: dynamic C 31.9 kN, static C0 10 kN, fatigue limit Pu 0.51 kN. Use C in life calculation and C0 for static checks at 40 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2208",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2208-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope, but catalogue C/C0 differ between executions (31.9/10 kN vs 19.9/6.95 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2208-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope, but catalogue C/C0 differ between executions (31.9/10 kN vs 19.9/6.95 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2208-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×23 mm envelope with catalogue ratings within 10 %; 2208 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2208-ETN9",
      "2208 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2208-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2208 EKTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 31.9,
    "static_load_kN": 10,
    "fatigue_load_limit_kN": 0.51,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2208 carries code 08 = 40 mm (code × 5). Envelope 40×80×23 mm (1.575×3.15×0.906 in) with a 20.0 mm radial section height, C 31.9 kN, C0 10 kN and Pu 0.51 kN. The open 2208 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 16000 r/min, limiting speed 11000 r/min, catalogue mass 510 g.",
    "applications": [
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 2208-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Assign interference to the rotating ring: on a 40 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The K suffix means a 1:12 tapered bore: 2208-EKTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The EKTN9 suffix on 2208-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 11000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 40 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2208-EKTN9 (C 31.9 kN, C0 10 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2208-EKTN9?",
        "a": "SKF 2208 EKTN9 measures 40 mm bore × 80 mm OD × 23 mm width (1.575 × 3.15 × 0.906 in), mass about 510 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2208 work?",
        "a": "The final two digits of 2208 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "How much misalignment can 2208-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2208-EKTN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2208-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2208",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2208-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope, but catalogue C/C0 differ between executions (31.9/10 kN vs 19.9/6.95 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2208-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope, but catalogue C/C0 differ between executions (31.9/10 kN vs 19.9/6.95 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2208-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×23 mm envelope with catalogue ratings within 10 %; 2208 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2208-EKTN9",
      "2208 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1308-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1308 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 33.8,
    "static_load_kN": 11.2,
    "fatigue_load_limit_kN": 0.57,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 9500,
    "max_rpm": 9500,
    "weight_g": 680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1308 carries code 08 = 40 mm (code × 5). Envelope 40×90×23 mm (1.575×3.543×0.906 in) with a 25.0 mm radial section height, C 33.8 kN, C0 11.2 kN and Pu 0.57 kN. The open 1308 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 40 mm shaft. Reference (thermal) speed 14000 r/min, limiting speed 9500 r/min, catalogue mass 680 g.",
    "applications": [
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 1308-ETN9 (C 33.8 kN, C0 11.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1308-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The ETN9 suffix on 1308-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 1308-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.57 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 40 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1308-ETN9?",
        "a": "SKF 1308 ETN9 measures 40 mm bore × 90 mm OD × 23 mm width (1.575 × 3.543 × 0.906 in), mass about 680 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1308 work?",
        "a": "The final two digits of 1308 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "Can 1308-ETN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 1308-ETN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 90 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1308",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1308-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 1308 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1308-ETN9",
      "1308 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1308-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1308 EKTN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 33.8,
    "static_load_kN": 11.2,
    "fatigue_load_limit_kN": 0.57,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 9500,
    "max_rpm": 9500,
    "weight_g": 680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1308 carries code 08 = 40 mm (code × 5). Envelope 40×90×23 mm (1.575×3.543×0.906 in) with a 25.0 mm radial section height, C 33.8 kN, C0 11.2 kN and Pu 0.57 kN. The open 1308 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 14000 r/min, limiting speed 9500 r/min, catalogue mass 680 g.",
    "applications": [
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 1308-EKTN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring: on a 40 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The K suffix means a 1:12 tapered bore: 1308-EKTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The EKTN9 suffix on 1308-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 40 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 1308-EKTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1308-EKTN9?",
        "a": "SKF 1308 EKTN9 measures 40 mm bore × 90 mm OD × 23 mm width (1.575 × 3.543 × 0.906 in), mass about 680 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1308 work?",
        "a": "The final two digits of 1308 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "How much misalignment can 1308-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1308-EKTN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 1308-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1308",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1308-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 1308 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1308-EKTN9",
      "1308 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2308-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2308 E-2RS1TN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 33.8,
    "static_load_kN": 11.2,
    "fatigue_load_limit_kN": 0.57,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 960,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2308 carries code 08 = 40 mm (code × 5). Envelope 40×90×33 mm (1.575×3.543×1.299 in) with a 25.0 mm radial section height, C 33.8 kN, C0 11.2 kN and Pu 0.57 kN. SKF spells the sealed execution 2308 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 40 mm shaft. Limiting speed 5000 r/min, catalogue mass 960 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2308-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The spherical outer raceway lets 2308-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Do not wash 2308-E-2RS1TN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "The E-2RS1TN9 suffix on 2308-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 2308-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2308-E-2RS1TN9 chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2308-E-2RS1TN9?",
        "a": "SKF 2308 E-2RS1TN9 measures 40 mm bore × 90 mm OD × 33 mm width (1.575 × 3.543 × 1.299 in), mass about 960 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2308 work?",
        "a": "The final two digits of 2308 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "What is the speed rating of 2308-E-2RS1TN9?",
        "a": "SKF publishes only the 5000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      },
      {
        "q": "How much misalignment can 2308-E-2RS1TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2308-E-2RS1TN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2308",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2308-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×33 mm envelope with catalogue ratings within 10 %; 2308 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2308-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope, but catalogue C/C0 differ between executions (33.8/11.2 kN vs 54/16 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2308-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope, but catalogue C/C0 differ between executions (33.8/11.2 kN vs 54/16 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2308-E-2RS1TN9",
      "2308 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2308-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2308 E-2RS1KTN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 33.8,
    "static_load_kN": 11.2,
    "fatigue_load_limit_kN": 0.57,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 960,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2308 carries code 08 = 40 mm (code × 5). Envelope 40×90×33 mm (1.575×3.543×1.299 in) with a 25.0 mm radial section height, C 33.8 kN, C0 11.2 kN and Pu 0.57 kN. SKF spells the sealed execution 2308 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 5000 r/min, catalogue mass 960 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 2308-E-2RS1KTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Fillet radii must clear the 2308-E-2RS1KTN9 chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Do not wash 2308-E-2RS1KTN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "On a sleeve-mounted 2308-E-2RS1KTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The E-2RS1KTN9 suffix on 2308-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2308-E-2RS1KTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2308-E-2RS1KTN9?",
        "a": "SKF 2308 E-2RS1KTN9 measures 40 mm bore × 90 mm OD × 33 mm width (1.575 × 3.543 × 1.299 in), mass about 960 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2308 work?",
        "a": "The final two digits of 2308 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "Which fits should I use for 2308-E-2RS1KTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 90 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2308-E-2RS1KTN9?",
        "a": "Catalogue mass is 960 g for 2308 E-2RS1KTN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2308",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2308-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×33 mm envelope with catalogue ratings within 10 %; 2308 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2308-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope, but catalogue C/C0 differ between executions (33.8/11.2 kN vs 54/16 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2308-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope, but catalogue C/C0 differ between executions (33.8/11.2 kN vs 54/16 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2308-E-2RS1KTN9",
      "2308 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2308-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2308 ETN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 54,
    "static_load_kN": 16,
    "fatigue_load_limit_kN": 0.82,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 930,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2308 carries code 08 = 40 mm (code × 5). Envelope 40×90×33 mm (1.575×3.543×1.299 in) with a 25.0 mm radial section height, C 54 kN, C0 16 kN and Pu 0.82 kN. The open 2308 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 40 mm shaft. Reference (thermal) speed 14000 r/min, limiting speed 10000 r/min, catalogue mass 930 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2308-ETN9 chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Fillet radii must clear the 2308-ETN9 chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The ETN9 suffix on 2308-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 10000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 2308-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2308-ETN9 chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2308-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2308-ETN9?",
        "a": "SKF 2308 ETN9 measures 40 mm bore × 90 mm OD × 33 mm width (1.575 × 3.543 × 1.299 in), mass about 930 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2308 work?",
        "a": "The final two digits of 2308 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "What load can 2308-ETN9 take?",
        "a": "Catalogue values for 2308 ETN9: dynamic C 54 kN, static C0 16 kN, fatigue limit Pu 0.82 kN. Use C in life calculation and C0 for static checks at 40 mm bore."
      },
      {
        "q": "What is the speed rating of 2308-ETN9?",
        "a": "SKF lists a 14000 r/min thermal reference speed and a 10000 r/min mechanical limiting speed for 2308 ETN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2308",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2308-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope, but catalogue C/C0 differ between executions (54/16 kN vs 33.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2308-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope, but catalogue C/C0 differ between executions (54/16 kN vs 33.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2308-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×33 mm envelope with catalogue ratings within 10 %; 2308 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2308-ETN9",
      "2308 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2308-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2308 EKTN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 54,
    "static_load_kN": 16,
    "fatigue_load_limit_kN": 0.82,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 930,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2308 carries code 08 = 40 mm (code × 5). Envelope 40×90×33 mm (1.575×3.543×1.299 in) with a 25.0 mm radial section height, C 54 kN, C0 16 kN and Pu 0.82 kN. The open 2308 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 14000 r/min, limiting speed 10000 r/min, catalogue mass 930 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2308-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The fatigue load limit is 0.82 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The K suffix means a 1:12 tapered bore: 2308-EKTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The EKTN9 suffix on 2308-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 10000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.82 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 40 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2308-EKTN9?",
        "a": "SKF 2308 EKTN9 measures 40 mm bore × 90 mm OD × 33 mm width (1.575 × 3.543 × 1.299 in), mass about 930 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2308 work?",
        "a": "The final two digits of 2308 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "How heavy is 2308-EKTN9?",
        "a": "Catalogue mass is 930 g for 2308 EKTN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2308-EKTN9 take?",
        "a": "Catalogue values for 2308 EKTN9: dynamic C 54 kN, static C0 16 kN, fatigue limit Pu 0.82 kN. Use C in life calculation and C0 for static checks at 40 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2308",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2308-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope, but catalogue C/C0 differ between executions (54/16 kN vs 33.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2308-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope, but catalogue C/C0 differ between executions (54/16 kN vs 33.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2308-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×33 mm envelope with catalogue ratings within 10 %; 2308 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2308-EKTN9",
      "2308 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1209-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1209 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.9,
    "static_load_kN": 7.8,
    "fatigue_load_limit_kN": 0.4,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1209 carries code 09 = 45 mm (code × 5). Envelope 45×85×19 mm (1.772×3.346×0.748 in) with a 20.0 mm radial section height, C 22.9 kN, C0 7.8 kN and Pu 0.4 kN. The open 1209 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 45 mm shaft. Reference (thermal) speed 17000 r/min, limiting speed 11000 r/min, catalogue mass 470 g.",
    "applications": [
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 1209-ETN9 (C 22.9 kN, C0 7.8 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1209-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The ETN9 suffix on 1209-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 11000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 1209-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.4 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 45 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1209-ETN9?",
        "a": "SKF 1209 ETN9 measures 45 mm bore × 85 mm OD × 19 mm width (1.772 × 3.346 × 0.748 in), mass about 470 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1209 work?",
        "a": "The final two digits of 1209 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "What is the speed rating of 1209-ETN9?",
        "a": "SKF lists a 17000 r/min thermal reference speed and a 11000 r/min mechanical limiting speed for 1209 ETN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1209-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1209-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1209",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1209-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 1209 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11209-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 11209 TN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1209-ETN9",
      "1209 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1209-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1209 EKTN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.9,
    "static_load_kN": 7.8,
    "fatigue_load_limit_kN": 0.4,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1209 carries code 09 = 45 mm (code × 5). Envelope 45×85×19 mm (1.772×3.346×0.748 in) with a 20.0 mm radial section height, C 22.9 kN, C0 7.8 kN and Pu 0.4 kN. The open 1209 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 17000 r/min, limiting speed 11000 r/min, catalogue mass 470 g.",
    "applications": [
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 1209-EKTN9 chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring: on a 45 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The K suffix means a 1:12 tapered bore: 1209-EKTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The EKTN9 suffix on 1209-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 11000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 45 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 1209-EKTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1209-EKTN9?",
        "a": "SKF 1209 EKTN9 measures 45 mm bore × 85 mm OD × 19 mm width (1.772 × 3.346 × 0.748 in), mass about 470 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1209 work?",
        "a": "The final two digits of 1209 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "How much misalignment can 1209-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1209-EKTN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 1209-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1209",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1209-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 1209 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11209-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 11209 TN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1209-EKTN9",
      "1209 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2209-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2209 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.9,
    "static_load_kN": 7.8,
    "fatigue_load_limit_kN": 0.4,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2209 carries code 09 = 45 mm (code × 5). Envelope 45×85×23 mm (1.772×3.346×0.906 in) with a 20.0 mm radial section height, C 22.9 kN, C0 7.8 kN and Pu 0.4 kN. SKF spells the sealed execution 2209 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 45 mm shaft. Limiting speed 5300 r/min, catalogue mass 530 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2209-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The spherical outer raceway lets 2209-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The 2RS1 contact seals on 2209-E-2RS1TN9 add drag and cap speed at 5300 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "The E-2RS1TN9 suffix on 2209-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 2209-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2209-E-2RS1TN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2209-E-2RS1TN9?",
        "a": "SKF 2209 E-2RS1TN9 measures 45 mm bore × 85 mm OD × 23 mm width (1.772 × 3.346 × 0.906 in), mass about 530 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2209 work?",
        "a": "The final two digits of 2209 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "Can 2209-E-2RS1TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2209-E-2RS1TN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 85 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2209",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2209-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×23 mm envelope with catalogue ratings within 10 %; 2209 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2209-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope, but catalogue C/C0 differ between executions (22.9/7.8 kN vs 32.5/10.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2209-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope, but catalogue C/C0 differ between executions (22.9/7.8 kN vs 32.5/10.6 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2209-E-2RS1TN9",
      "2209 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2209-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2209 E-2RS1KTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.9,
    "static_load_kN": 7.8,
    "fatigue_load_limit_kN": 0.4,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2209 carries code 09 = 45 mm (code × 5). Envelope 45×85×23 mm (1.772×3.346×0.906 in) with a 20.0 mm radial section height, C 22.9 kN, C0 7.8 kN and Pu 0.4 kN. SKF spells the sealed execution 2209 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 5300 r/min, catalogue mass 530 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 2209-E-2RS1KTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Fillet radii must clear the 2209-E-2RS1KTN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Do not wash 2209-E-2RS1KTN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "On a sleeve-mounted 2209-E-2RS1KTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The E-2RS1KTN9 suffix on 2209-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2209-E-2RS1KTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2209-E-2RS1KTN9?",
        "a": "SKF 2209 E-2RS1KTN9 measures 45 mm bore × 85 mm OD × 23 mm width (1.772 × 3.346 × 0.906 in), mass about 530 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2209 work?",
        "a": "The final two digits of 2209 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "Which fits should I use for 2209-E-2RS1KTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 85 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2209-E-2RS1KTN9?",
        "a": "Catalogue mass is 530 g for 2209 E-2RS1KTN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2209",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2209-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×23 mm envelope with catalogue ratings within 10 %; 2209 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2209-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope, but catalogue C/C0 differ between executions (22.9/7.8 kN vs 32.5/10.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2209-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope, but catalogue C/C0 differ between executions (22.9/7.8 kN vs 32.5/10.6 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2209-E-2RS1KTN9",
      "2209 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2209-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2209 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 10.6,
    "fatigue_load_limit_kN": 0.54,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2209 carries code 09 = 45 mm (code × 5). Envelope 45×85×23 mm (1.772×3.346×0.906 in) with a 20.0 mm radial section height, C 32.5 kN, C0 10.6 kN and Pu 0.54 kN. The open 2209 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 45 mm shaft. Reference (thermal) speed 15000 r/min, limiting speed 10000 r/min, catalogue mass 550 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2209-ETN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Fillet radii must clear the 2209-ETN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The ETN9 suffix on 2209-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 10000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 2209-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2209-ETN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2209-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2209-ETN9?",
        "a": "SKF 2209 ETN9 measures 45 mm bore × 85 mm OD × 23 mm width (1.772 × 3.346 × 0.906 in), mass about 550 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2209 work?",
        "a": "The final two digits of 2209 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "Which fits should I use for 2209-ETN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 85 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2209-ETN9?",
        "a": "Catalogue mass is 550 g for 2209 ETN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2209",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2209-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope, but catalogue C/C0 differ between executions (32.5/10.6 kN vs 22.9/7.8 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2209-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope, but catalogue C/C0 differ between executions (32.5/10.6 kN vs 22.9/7.8 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2209-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×23 mm envelope with catalogue ratings within 10 %; 2209 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2209-ETN9",
      "2209 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2209-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2209 EKTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 10.6,
    "fatigue_load_limit_kN": 0.54,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2209 carries code 09 = 45 mm (code × 5). Envelope 45×85×23 mm (1.772×3.346×0.906 in) with a 20.0 mm radial section height, C 32.5 kN, C0 10.6 kN and Pu 0.54 kN. The open 2209 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 15000 r/min, limiting speed 10000 r/min, catalogue mass 550 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2209-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The fatigue load limit is 0.54 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The EKTN9 suffix on 2209-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 10000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.54 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 45 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2209-EKTN9?",
        "a": "SKF 2209 EKTN9 measures 45 mm bore × 85 mm OD × 23 mm width (1.772 × 3.346 × 0.906 in), mass about 550 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2209 work?",
        "a": "The final two digits of 2209 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "Can 2209-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2209-EKTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 85 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2209",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2209-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope, but catalogue C/C0 differ between executions (32.5/10.6 kN vs 22.9/7.8 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2209-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope, but catalogue C/C0 differ between executions (32.5/10.6 kN vs 22.9/7.8 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2209-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×23 mm envelope with catalogue ratings within 10 %; 2209 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2209-EKTN9",
      "2209 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1309-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1309 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39,
    "static_load_kN": 13.4,
    "fatigue_load_limit_kN": 0.7,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 960,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1309 carries code 09 = 45 mm (code × 5). Envelope 45×100×25 mm (1.772×3.937×0.984 in) with a 27.5 mm radial section height, C 39 kN, C0 13.4 kN and Pu 0.7 kN. The open 1309 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 45 mm shaft. Reference (thermal) speed 12000 r/min, limiting speed 8500 r/min, catalogue mass 960 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 1309-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Fillet radii must clear the 1309-ETN9 chamfer so the 25 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The ETN9 suffix on 1309-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 8500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 1309-ETN9 (C 39 kN, C0 13.4 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1309-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.7 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1309-ETN9?",
        "a": "SKF 1309 ETN9 measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 960 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1309 work?",
        "a": "The final two digits of 1309 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "How much misalignment can 1309-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1309-ETN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 1309-ETN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1309",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1309-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 1309 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1309-ETN9",
      "1309 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1309-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1309 EKTN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39,
    "static_load_kN": 13.4,
    "fatigue_load_limit_kN": 0.7,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 960,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1309 carries code 09 = 45 mm (code × 5). Envelope 45×100×25 mm (1.772×3.937×0.984 in) with a 27.5 mm radial section height, C 39 kN, C0 13.4 kN and Pu 0.7 kN. The open 1309 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 12000 r/min, limiting speed 8500 r/min, catalogue mass 960 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.7 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The fatigue load limit is 0.7 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The K suffix means a 1:12 tapered bore: 1309-EKTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The EKTN9 suffix on 1309-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 8500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1309-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 45 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1309-EKTN9?",
        "a": "SKF 1309 EKTN9 measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 960 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1309 work?",
        "a": "The final two digits of 1309 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "How heavy is 1309-EKTN9?",
        "a": "Catalogue mass is 960 g for 1309 EKTN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 1309-EKTN9 take?",
        "a": "Catalogue values for 1309 EKTN9: dynamic C 39 kN, static C0 13.4 kN, fatigue limit Pu 0.7 kN. Use C in life calculation and C0 for static checks at 45 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1309",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1309-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 1309 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1309-EKTN9",
      "1309 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2309-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2309 E-2RS1TN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39,
    "static_load_kN": 13.4,
    "fatigue_load_limit_kN": 0.7,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 1300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2309 carries code 09 = 45 mm (code × 5). Envelope 45×100×36 mm (1.772×3.937×1.417 in) with a 27.5 mm radial section height, C 39 kN, C0 13.4 kN and Pu 0.7 kN. SKF spells the sealed execution 2309 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 45 mm shaft. Limiting speed 4500 r/min, catalogue mass 1300 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 45 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Fillet radii must clear the 2309-E-2RS1TN9 chamfer so the 36 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Do not wash 2309-E-2RS1TN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "The E-2RS1TN9 suffix on 2309-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2309-E-2RS1TN9 chamfer so the 36 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2309-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2309-E-2RS1TN9?",
        "a": "SKF 2309 E-2RS1TN9 measures 45 mm bore × 100 mm OD × 36 mm width (1.772 × 3.937 × 1.417 in), mass about 1300 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2309 work?",
        "a": "The final two digits of 2309 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "Which fits should I use for 2309-E-2RS1TN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 100 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2309-E-2RS1TN9?",
        "a": "Catalogue mass is 1300 g for 2309 E-2RS1TN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2309",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2309-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×36 mm envelope with catalogue ratings within 10 %; 2309 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2309-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope, but catalogue C/C0 differ between executions (39/13.4 kN vs 63.7/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2309-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope, but catalogue C/C0 differ between executions (39/13.4 kN vs 63.7/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2309-E-2RS1TN9",
      "2309 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2309-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2309 E-2RS1KTN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39,
    "static_load_kN": 13.4,
    "fatigue_load_limit_kN": 0.7,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 1300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2309 carries code 09 = 45 mm (code × 5). Envelope 45×100×36 mm (1.772×3.937×1.417 in) with a 27.5 mm radial section height, C 39 kN, C0 13.4 kN and Pu 0.7 kN. SKF spells the sealed execution 2309 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 4500 r/min, catalogue mass 1300 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2309-E-2RS1KTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The fatigue load limit is 0.7 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The 2RS1 contact seals on 2309-E-2RS1KTN9 add drag and cap speed at 4500 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The E-2RS1KTN9 suffix on 2309-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 45 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2309-E-2RS1KTN9?",
        "a": "SKF 2309 E-2RS1KTN9 measures 45 mm bore × 100 mm OD × 36 mm width (1.772 × 3.937 × 1.417 in), mass about 1300 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2309 work?",
        "a": "The final two digits of 2309 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "Can 2309-E-2RS1KTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2309-E-2RS1KTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 100 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2309",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2309-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×36 mm envelope with catalogue ratings within 10 %; 2309 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2309-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope, but catalogue C/C0 differ between executions (39/13.4 kN vs 63.7/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2309-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope, but catalogue C/C0 differ between executions (39/13.4 kN vs 63.7/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2309-E-2RS1KTN9",
      "2309 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2309-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2309 ETN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 63.7,
    "static_load_kN": 19.3,
    "fatigue_load_limit_kN": 1,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 1250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2309 carries code 09 = 45 mm (code × 5). Envelope 45×100×36 mm (1.772×3.937×1.417 in) with a 27.5 mm radial section height, C 63.7 kN, C0 19.3 kN and Pu 1 kN. The open 2309 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 45 mm shaft. Reference (thermal) speed 13000 r/min, limiting speed 9000 r/min, catalogue mass 1250 g.",
    "applications": [
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2309-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2309-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The ETN9 suffix on 2309-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2309-ETN9 chamfer so the 36 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2309-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 45 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2309-ETN9?",
        "a": "SKF 2309 ETN9 measures 45 mm bore × 100 mm OD × 36 mm width (1.772 × 3.937 × 1.417 in), mass about 1250 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2309 work?",
        "a": "The final two digits of 2309 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "What is the speed rating of 2309-ETN9?",
        "a": "SKF lists a 13000 r/min thermal reference speed and a 9000 r/min mechanical limiting speed for 2309 ETN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 2309-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2309-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2309",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2309-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope, but catalogue C/C0 differ between executions (63.7/19.3 kN vs 39/13.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2309-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope, but catalogue C/C0 differ between executions (63.7/19.3 kN vs 39/13.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2309-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×36 mm envelope with catalogue ratings within 10 %; 2309 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2309-ETN9",
      "2309 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2309-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2309 EKTN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 63.7,
    "static_load_kN": 19.3,
    "fatigue_load_limit_kN": 1,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 1250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2309 carries code 09 = 45 mm (code × 5). Envelope 45×100×36 mm (1.772×3.937×1.417 in) with a 27.5 mm radial section height, C 63.7 kN, C0 19.3 kN and Pu 1 kN. The open 2309 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 13000 r/min, limiting speed 9000 r/min, catalogue mass 1250 g.",
    "applications": [
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 2309-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Assign interference to the rotating ring: on a 45 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The K suffix means a 1:12 tapered bore: 2309-EKTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The EKTN9 suffix on 2309-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 45 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2309-EKTN9 (C 63.7 kN, C0 19.3 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2309-EKTN9?",
        "a": "SKF 2309 EKTN9 measures 45 mm bore × 100 mm OD × 36 mm width (1.772 × 3.937 × 1.417 in), mass about 1250 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2309 work?",
        "a": "The final two digits of 2309 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "How much misalignment can 2309-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2309-EKTN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2309-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2309",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2309-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope, but catalogue C/C0 differ between executions (63.7/19.3 kN vs 39/13.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2309-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope, but catalogue C/C0 differ between executions (63.7/19.3 kN vs 39/13.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2309-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×36 mm envelope with catalogue ratings within 10 %; 2309 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2309-EKTN9",
      "2309 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1210-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1210 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 9.15,
    "fatigue_load_limit_kN": 0.48,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1210 carries code 10 = 50 mm (code × 5). Envelope 50×90×20 mm (1.969×3.543×0.787 in) with a 20.0 mm radial section height, C 26.5 kN, C0 9.15 kN and Pu 0.48 kN. The open 1210 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 50 mm shaft. Reference (thermal) speed 16000 r/min, limiting speed 10000 r/min, catalogue mass 530 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1210-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Catalogue ratings for 1210-ETN9 (C 26.5 kN, C0 9.15 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The ETN9 suffix on 1210-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 10000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 50 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 1210-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 1210-ETN9 chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1210-ETN9?",
        "a": "SKF 1210 ETN9 measures 50 mm bore × 90 mm OD × 20 mm width (1.969 × 3.543 × 0.787 in), mass about 530 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1210 work?",
        "a": "The final two digits of 1210 are bore code 10, multiplied by 5 to give 50 mm."
      },
      {
        "q": "Can 1210-ETN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 1210-ETN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 90 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1210",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1210-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 1210 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11210-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 11210 TN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1210-ETN9",
      "1210 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1210-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1210 EKTN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 9.15,
    "fatigue_load_limit_kN": 0.48,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1210 carries code 10 = 50 mm (code × 5). Envelope 50×90×20 mm (1.969×3.543×0.787 in) with a 20.0 mm radial section height, C 26.5 kN, C0 9.15 kN and Pu 0.48 kN. The open 1210 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 16000 r/min, limiting speed 10000 r/min, catalogue mass 530 g.",
    "applications": [
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 50 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Mount 1210-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The EKTN9 suffix on 1210-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 10000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 1210-EKTN9 chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1210-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1210-EKTN9?",
        "a": "SKF 1210 EKTN9 measures 50 mm bore × 90 mm OD × 20 mm width (1.969 × 3.543 × 0.787 in), mass about 530 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1210 work?",
        "a": "The final two digits of 1210 are bore code 10, multiplied by 5 to give 50 mm."
      },
      {
        "q": "What load can 1210-EKTN9 take?",
        "a": "Catalogue values for 1210 EKTN9: dynamic C 26.5 kN, static C0 9.15 kN, fatigue limit Pu 0.48 kN. Use C in life calculation and C0 for static checks at 50 mm bore."
      },
      {
        "q": "What is the speed rating of 1210-EKTN9?",
        "a": "SKF lists a 16000 r/min thermal reference speed and a 10000 r/min mechanical limiting speed for 1210 EKTN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1210",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1210-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 1210 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11210-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 11210 TN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1210-EKTN9",
      "1210 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2210-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2210 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.9,
    "static_load_kN": 8.15,
    "fatigue_load_limit_kN": 0.42,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2210 carries code 10 = 50 mm (code × 5). Envelope 50×90×23 mm (1.969×3.543×0.906 in) with a 20.0 mm radial section height, C 22.9 kN, C0 8.15 kN and Pu 0.42 kN. SKF spells the sealed execution 2210 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 50 mm shaft. Limiting speed 4800 r/min, catalogue mass 570 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2210-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The fatigue load limit is 0.42 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The 2RS1 contact seals on 2210-E-2RS1TN9 add drag and cap speed at 4800 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "The E-2RS1TN9 suffix on 2210-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4800 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.42 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 50 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2210-E-2RS1TN9?",
        "a": "SKF 2210 E-2RS1TN9 measures 50 mm bore × 90 mm OD × 23 mm width (1.969 × 3.543 × 0.906 in), mass about 570 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2210 work?",
        "a": "The final two digits of 2210 are bore code 10, multiplied by 5 to give 50 mm."
      },
      {
        "q": "Can 2210-E-2RS1TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2210-E-2RS1TN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 90 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2210",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2210-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×23 mm envelope with catalogue ratings within 10 %; 2210 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2210-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope, but catalogue C/C0 differ between executions (22.9/8.15 kN vs 33.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2210-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope, but catalogue C/C0 differ between executions (22.9/8.15 kN vs 33.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2210-E-2RS1TN9",
      "2210 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2210-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2210 E-2RS1KTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.9,
    "static_load_kN": 8.15,
    "fatigue_load_limit_kN": 0.42,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2210 carries code 10 = 50 mm (code × 5). Envelope 50×90×23 mm (1.969×3.543×0.906 in) with a 20.0 mm radial section height, C 22.9 kN, C0 8.15 kN and Pu 0.42 kN. SKF spells the sealed execution 2210 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 4800 r/min, catalogue mass 570 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 50 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "At 50 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2210-E-2RS1KTN9 to avoid seal-lip binding.",
      "The K suffix means a 1:12 tapered bore: 2210-E-2RS1KTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The E-2RS1KTN9 suffix on 2210-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4800 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 2210-E-2RS1KTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2210-E-2RS1KTN9?",
        "a": "SKF 2210 E-2RS1KTN9 measures 50 mm bore × 90 mm OD × 23 mm width (1.969 × 3.543 × 0.906 in), mass about 570 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2210 work?",
        "a": "The final two digits of 2210 are bore code 10, multiplied by 5 to give 50 mm."
      },
      {
        "q": "How much misalignment can 2210-E-2RS1KTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2210-E-2RS1KTN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2210-E-2RS1KTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2210",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2210-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×23 mm envelope with catalogue ratings within 10 %; 2210 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2210-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope, but catalogue C/C0 differ between executions (22.9/8.15 kN vs 33.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2210-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope, but catalogue C/C0 differ between executions (22.9/8.15 kN vs 33.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2210-E-2RS1KTN9",
      "2210 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2210-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2210 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 33.8,
    "static_load_kN": 11.2,
    "fatigue_load_limit_kN": 0.57,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 9500,
    "max_rpm": 9500,
    "weight_g": 600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2210 carries code 10 = 50 mm (code × 5). Envelope 50×90×23 mm (1.969×3.543×0.906 in) with a 20.0 mm radial section height, C 33.8 kN, C0 11.2 kN and Pu 0.57 kN. The open 2210 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 50 mm shaft. Reference (thermal) speed 14000 r/min, limiting speed 9500 r/min, catalogue mass 600 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 50 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "At 50 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The ETN9 suffix on 2210-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.57 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 50 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 2210-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2210-ETN9?",
        "a": "SKF 2210 ETN9 measures 50 mm bore × 90 mm OD × 23 mm width (1.969 × 3.543 × 0.906 in), mass about 600 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2210 work?",
        "a": "The final two digits of 2210 are bore code 10, multiplied by 5 to give 50 mm."
      },
      {
        "q": "How much misalignment can 2210-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2210-ETN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2210-ETN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2210",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2210-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope, but catalogue C/C0 differ between executions (33.8/11.2 kN vs 22.9/8.15 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2210-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope, but catalogue C/C0 differ between executions (33.8/11.2 kN vs 22.9/8.15 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2210-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×23 mm envelope with catalogue ratings within 10 %; 2210 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2210-ETN9",
      "2210 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2210-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2210 EKTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 33.8,
    "static_load_kN": 11.2,
    "fatigue_load_limit_kN": 0.57,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 9500,
    "max_rpm": 9500,
    "weight_g": 600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2210 carries code 10 = 50 mm (code × 5). Envelope 50×90×23 mm (1.969×3.543×0.906 in) with a 20.0 mm radial section height, C 33.8 kN, C0 11.2 kN and Pu 0.57 kN. The open 2210 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 14000 r/min, limiting speed 9500 r/min, catalogue mass 600 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 2210-EKTN9 (C 33.8 kN, C0 11.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Catalogue ratings for 2210-EKTN9 (C 33.8 kN, C0 11.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The EKTN9 suffix on 2210-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 2210-EKTN9 (C 33.8 kN, C0 11.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 2210-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2210-EKTN9?",
        "a": "SKF 2210 EKTN9 measures 50 mm bore × 90 mm OD × 23 mm width (1.969 × 3.543 × 0.906 in), mass about 600 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2210 work?",
        "a": "The final two digits of 2210 are bore code 10, multiplied by 5 to give 50 mm."
      },
      {
        "q": "Can 2210-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2210-EKTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 90 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2210",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2210-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope, but catalogue C/C0 differ between executions (33.8/11.2 kN vs 22.9/8.15 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2210-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope, but catalogue C/C0 differ between executions (33.8/11.2 kN vs 22.9/8.15 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2210-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×23 mm envelope with catalogue ratings within 10 %; 2210 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2210-EKTN9",
      "2210 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1310-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1310 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 43.6,
    "static_load_kN": 14,
    "fatigue_load_limit_kN": 0.72,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1310 carries code 10 = 50 mm (code × 5). Envelope 50×110×27 mm (1.969×4.331×1.063 in) with a 30.0 mm radial section height, C 43.6 kN, C0 14 kN and Pu 0.72 kN. The open 1310 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 50 mm shaft. Reference (thermal) speed 12000 r/min, limiting speed 8000 r/min, catalogue mass 1200 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 50 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "At 50 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The ETN9 suffix on 1310-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 8000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1310-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 50 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 1310-ETN9 (C 43.6 kN, C0 14 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1310-ETN9?",
        "a": "SKF 1310 ETN9 measures 50 mm bore × 110 mm OD × 27 mm width (1.969 × 4.331 × 1.063 in), mass about 1200 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1310 work?",
        "a": "The final two digits of 1310 are bore code 10, multiplied by 5 to give 50 mm."
      },
      {
        "q": "How much misalignment can 1310-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1310-ETN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 1310-ETN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1310",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1310-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 1310 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1310-ETN9",
      "1310 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1310-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1310 EKTN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 43.6,
    "static_load_kN": 14,
    "fatigue_load_limit_kN": 0.72,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1310 carries code 10 = 50 mm (code × 5). Envelope 50×110×27 mm (1.969×4.331×1.063 in) with a 30.0 mm radial section height, C 43.6 kN, C0 14 kN and Pu 0.72 kN. The open 1310 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 12000 r/min, limiting speed 8000 r/min, catalogue mass 1200 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 1310-EKTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Catalogue ratings for 1310-EKTN9 (C 43.6 kN, C0 14 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "On a sleeve-mounted 1310-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 1310-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 8000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 1310-EKTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 1310-EKTN9 chamfer so the 27 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1310-EKTN9?",
        "a": "SKF 1310 EKTN9 measures 50 mm bore × 110 mm OD × 27 mm width (1.969 × 4.331 × 1.063 in), mass about 1200 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1310 work?",
        "a": "The final two digits of 1310 are bore code 10, multiplied by 5 to give 50 mm."
      },
      {
        "q": "What is the speed rating of 1310-EKTN9?",
        "a": "SKF lists a 12000 r/min thermal reference speed and a 8000 r/min mechanical limiting speed for 1310 EKTN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1310-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1310-EKTN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1310",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1310-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 1310 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1310-EKTN9",
      "1310 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2310-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2310 E-2RS1TN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 43.6,
    "static_load_kN": 14,
    "fatigue_load_limit_kN": 0.72,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 1650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2310 carries code 10 = 50 mm (code × 5). Envelope 50×110×40 mm (1.969×4.331×1.575 in) with a 30.0 mm radial section height, C 43.6 kN, C0 14 kN and Pu 0.72 kN. SKF spells the sealed execution 2310 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 50 mm shaft. Limiting speed 4000 r/min, catalogue mass 1650 g.",
    "applications": [
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 2310-E-2RS1TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Assign interference to the rotating ring: on a 50 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The 2RS1 contact seals on 2310-E-2RS1TN9 add drag and cap speed at 4000 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "The E-2RS1TN9 suffix on 2310-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 50 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2310-E-2RS1TN9 (C 43.6 kN, C0 14 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2310-E-2RS1TN9?",
        "a": "SKF 2310 E-2RS1TN9 measures 50 mm bore × 110 mm OD × 40 mm width (1.969 × 4.331 × 1.575 in), mass about 1650 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2310 work?",
        "a": "The final two digits of 2310 are bore code 10, multiplied by 5 to give 50 mm."
      },
      {
        "q": "What load can 2310-E-2RS1TN9 take?",
        "a": "Catalogue values for 2310 E-2RS1TN9: dynamic C 43.6 kN, static C0 14 kN, fatigue limit Pu 0.72 kN. Use C in life calculation and C0 for static checks at 50 mm bore."
      },
      {
        "q": "What is the speed rating of 2310-E-2RS1TN9?",
        "a": "SKF publishes only the 4000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2310",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×40 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2310-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×40 mm envelope with catalogue ratings within 10 %; 2310 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2310-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×40 mm envelope, but catalogue C/C0 differ between executions (43.6/14 kN vs 63.7/20 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2310-E-2RS1TN9",
      "2310 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2310-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2310 E-2RS1KTN9",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 43.6,
    "static_load_kN": 14,
    "fatigue_load_limit_kN": 0.72,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 1650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2310 carries code 10 = 50 mm (code × 5). Envelope 50×110×40 mm (1.969×4.331×1.575 in) with a 30.0 mm radial section height, C 43.6 kN, C0 14 kN and Pu 0.72 kN. SKF spells the sealed execution 2310 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 4000 r/min, catalogue mass 1650 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.72 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The spherical outer raceway lets 2310-E-2RS1KTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2310-E-2RS1KTN9 to avoid seal-lip binding.",
      "The K suffix means a 1:12 tapered bore: 2310-E-2RS1KTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The E-2RS1KTN9 suffix on 2310-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2310-E-2RS1KTN9 chamfer so the 40 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2310-E-2RS1KTN9?",
        "a": "SKF 2310 E-2RS1KTN9 measures 50 mm bore × 110 mm OD × 40 mm width (1.969 × 4.331 × 1.575 in), mass about 1650 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2310 work?",
        "a": "The final two digits of 2310 are bore code 10, multiplied by 5 to give 50 mm."
      },
      {
        "q": "How heavy is 2310-E-2RS1KTN9?",
        "a": "Catalogue mass is 1650 g for 2310 E-2RS1KTN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2310-E-2RS1KTN9 take?",
        "a": "Catalogue values for 2310 E-2RS1KTN9: dynamic C 43.6 kN, static C0 14 kN, fatigue limit Pu 0.72 kN. Use C in life calculation and C0 for static checks at 50 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2310",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×40 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2310-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×40 mm envelope with catalogue ratings within 10 %; 2310 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2310-K",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×40 mm envelope, but catalogue C/C0 differ between executions (43.6/14 kN vs 63.7/20 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2310-E-2RS1KTN9",
      "2310 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2310-K",
    "brand": "SKF",
    "manufacturer_designation": "2310 K",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 63.7,
    "static_load_kN": 20,
    "fatigue_load_limit_kN": 1.04,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 9500,
    "max_rpm": 9500,
    "weight_g": 1650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2310 carries code 10 = 50 mm (code × 5). Envelope 50×110×40 mm (1.969×4.331×1.575 in) with a 30.0 mm radial section height, C 63.7 kN, C0 20 kN and Pu 1.04 kN. The open 2310 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 14000 r/min, limiting speed 9500 r/min, catalogue mass 1650 g.",
    "applications": [
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 50 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Mount 2310-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The  suffix on 2310-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2310-K chamfer so the 40 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2310-K (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2310-K?",
        "a": "SKF 2310 K measures 50 mm bore × 110 mm OD × 40 mm width (1.969 × 4.331 × 1.575 in), mass about 1650 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2310 work?",
        "a": "The final two digits of 2310 are bore code 10, multiplied by 5 to give 50 mm."
      },
      {
        "q": "What load can 2310-K take?",
        "a": "Catalogue values for 2310 K: dynamic C 63.7 kN, static C0 20 kN, fatigue limit Pu 1.04 kN. Use C in life calculation and C0 for static checks at 50 mm bore."
      },
      {
        "q": "What is the speed rating of 2310-K?",
        "a": "SKF lists a 14000 r/min thermal reference speed and a 9500 r/min mechanical limiting speed for 2310 K; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2310",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2310-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×40 mm envelope, but catalogue C/C0 differ between executions (63.7/20 kN vs 43.6/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2310-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×40 mm envelope, but catalogue C/C0 differ between executions (63.7/20 kN vs 43.6/14 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2310-K",
      "2310 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1211-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1211 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 27.6,
    "static_load_kN": 10.6,
    "fatigue_load_limit_kN": 0.54,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1211 carries code 11 = 55 mm (code × 5). Envelope 55×100×21 mm (2.165×3.937×0.827 in) with a 22.5 mm radial section height, C 27.6 kN, C0 10.6 kN and Pu 0.54 kN. The open 1211 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 55 mm shaft. Reference (thermal) speed 14000 r/min, limiting speed 9000 r/min, catalogue mass 710 g.",
    "applications": [
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 55 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Assign interference to the rotating ring: on a 55 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The ETN9 suffix on 1211-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.54 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 55 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 1211-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1211-ETN9?",
        "a": "SKF 1211 ETN9 measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 710 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1211 work?",
        "a": "The final two digits of 1211 are bore code 11, multiplied by 5 to give 55 mm."
      },
      {
        "q": "What load can 1211-ETN9 take?",
        "a": "Catalogue values for 1211 ETN9: dynamic C 27.6 kN, static C0 10.6 kN, fatigue limit Pu 0.54 kN. Use C in life calculation and C0 for static checks at 55 mm bore."
      },
      {
        "q": "What is the speed rating of 1211-ETN9?",
        "a": "SKF lists a 14000 r/min thermal reference speed and a 9000 r/min mechanical limiting speed for 1211 ETN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1211",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1211-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 1211 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1211-ETN9",
      "1211 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1211-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1211 EKTN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 27.6,
    "static_load_kN": 10.6,
    "fatigue_load_limit_kN": 0.54,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1211 carries code 11 = 55 mm (code × 5). Envelope 55×100×21 mm (2.165×3.937×0.827 in) with a 22.5 mm radial section height, C 27.6 kN, C0 10.6 kN and Pu 0.54 kN. The open 1211 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 14000 r/min, limiting speed 9000 r/min, catalogue mass 710 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 1211-EKTN9 (C 27.6 kN, C0 10.6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The spherical outer raceway lets 1211-EKTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The EKTN9 suffix on 1211-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 1211-EKTN9 (C 27.6 kN, C0 10.6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1211-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1211-EKTN9?",
        "a": "SKF 1211 EKTN9 measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 710 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1211 work?",
        "a": "The final two digits of 1211 are bore code 11, multiplied by 5 to give 55 mm."
      },
      {
        "q": "Can 1211-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 1211-EKTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 100 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1211",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1211-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 1211 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1211-EKTN9",
      "1211 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2211-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2211 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 27.6,
    "static_load_kN": 10.6,
    "fatigue_load_limit_kN": 0.54,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2211 carries code 11 = 55 mm (code × 5). Envelope 55×100×25 mm (2.165×3.937×0.984 in) with a 22.5 mm radial section height, C 27.6 kN, C0 10.6 kN and Pu 0.54 kN. SKF spells the sealed execution 2211 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 55 mm shaft. Limiting speed 4300 r/min, catalogue mass 790 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2211-E-2RS1TN9 chamfer so the 25 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "At 55 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2211-E-2RS1TN9 to avoid seal-lip binding.",
      "The E-2RS1TN9 suffix on 2211-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 55 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 2211-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2211-E-2RS1TN9?",
        "a": "SKF 2211 E-2RS1TN9 measures 55 mm bore × 100 mm OD × 25 mm width (2.165 × 3.937 × 0.984 in), mass about 790 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2211 work?",
        "a": "The final two digits of 2211 are bore code 11, multiplied by 5 to give 55 mm."
      },
      {
        "q": "How much misalignment can 2211-E-2RS1TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2211-E-2RS1TN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2211-E-2RS1TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2211",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2211-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×25 mm envelope with catalogue ratings within 10 %; 2211 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2211-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between executions (27.6/10.6 kN vs 39/13.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2211-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between executions (27.6/10.6 kN vs 39/13.4 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2211-E-2RS1TN9",
      "2211 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2211-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2211 E-2RS1KTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 27.6,
    "static_load_kN": 10.6,
    "fatigue_load_limit_kN": 0.54,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2211 carries code 11 = 55 mm (code × 5). Envelope 55×100×25 mm (2.165×3.937×0.984 in) with a 22.5 mm radial section height, C 27.6 kN, C0 10.6 kN and Pu 0.54 kN. SKF spells the sealed execution 2211 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 4300 r/min, catalogue mass 790 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2211-E-2RS1KTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Catalogue ratings for 2211-E-2RS1KTN9 (C 27.6 kN, C0 10.6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2211-E-2RS1KTN9 to avoid seal-lip binding.",
      "The K suffix means a 1:12 tapered bore: 2211-E-2RS1KTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The E-2RS1KTN9 suffix on 2211-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 2211-E-2RS1KTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2211-E-2RS1KTN9?",
        "a": "SKF 2211 E-2RS1KTN9 measures 55 mm bore × 100 mm OD × 25 mm width (2.165 × 3.937 × 0.984 in), mass about 790 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2211 work?",
        "a": "The final two digits of 2211 are bore code 11, multiplied by 5 to give 55 mm."
      },
      {
        "q": "How heavy is 2211-E-2RS1KTN9?",
        "a": "Catalogue mass is 790 g for 2211 E-2RS1KTN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2211-E-2RS1KTN9 take?",
        "a": "Catalogue values for 2211 E-2RS1KTN9: dynamic C 27.6 kN, static C0 10.6 kN, fatigue limit Pu 0.54 kN. Use C in life calculation and C0 for static checks at 55 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2211",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2211-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×25 mm envelope with catalogue ratings within 10 %; 2211 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2211-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between executions (27.6/10.6 kN vs 39/13.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2211-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between executions (27.6/10.6 kN vs 39/13.4 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2211-E-2RS1KTN9",
      "2211 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2211-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2211 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39,
    "static_load_kN": 13.4,
    "fatigue_load_limit_kN": 0.7,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2211 carries code 11 = 55 mm (code × 5). Envelope 55×100×25 mm (2.165×3.937×0.984 in) with a 22.5 mm radial section height, C 39 kN, C0 13.4 kN and Pu 0.7 kN. The open 2211 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 55 mm shaft. Reference (thermal) speed 12000 r/min, limiting speed 8500 r/min, catalogue mass 810 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2211-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The spherical outer raceway lets 2211-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The ETN9 suffix on 2211-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 8500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 55 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 2211-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2211-ETN9 chamfer so the 25 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2211-ETN9?",
        "a": "SKF 2211 ETN9 measures 55 mm bore × 100 mm OD × 25 mm width (2.165 × 3.937 × 0.984 in), mass about 810 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2211 work?",
        "a": "The final two digits of 2211 are bore code 11, multiplied by 5 to give 55 mm."
      },
      {
        "q": "What is the speed rating of 2211-ETN9?",
        "a": "SKF lists a 12000 r/min thermal reference speed and a 8500 r/min mechanical limiting speed for 2211 ETN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 2211-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2211-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2211",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2211-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between executions (39/13.4 kN vs 27.6/10.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2211-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between executions (39/13.4 kN vs 27.6/10.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2211-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×25 mm envelope with catalogue ratings within 10 %; 2211 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2211-ETN9",
      "2211 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2211-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2211 EKTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39,
    "static_load_kN": 13.4,
    "fatigue_load_limit_kN": 0.7,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2211 carries code 11 = 55 mm (code × 5). Envelope 55×100×25 mm (2.165×3.937×0.984 in) with a 22.5 mm radial section height, C 39 kN, C0 13.4 kN and Pu 0.7 kN. The open 2211 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 12000 r/min, limiting speed 8500 r/min, catalogue mass 810 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 55 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Fillet radii must clear the 2211-EKTN9 chamfer so the 25 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "On a sleeve-mounted 2211-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 2211-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 8500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2211-EKTN9 chamfer so the 25 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2211-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2211-EKTN9?",
        "a": "SKF 2211 EKTN9 measures 55 mm bore × 100 mm OD × 25 mm width (2.165 × 3.937 × 0.984 in), mass about 810 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2211 work?",
        "a": "The final two digits of 2211 are bore code 11, multiplied by 5 to give 55 mm."
      },
      {
        "q": "Which fits should I use for 2211-EKTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 100 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2211-EKTN9?",
        "a": "Catalogue mass is 810 g for 2211 EKTN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2211",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2211-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between executions (39/13.4 kN vs 27.6/10.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2211-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope, but catalogue C/C0 differ between executions (39/13.4 kN vs 27.6/10.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2211-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×25 mm envelope with catalogue ratings within 10 %; 2211 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2211-EKTN9",
      "2211 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1311-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1311 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 50.7,
    "static_load_kN": 18,
    "fatigue_load_limit_kN": 0.92,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 1600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1311 carries code 11 = 55 mm (code × 5). Envelope 55×120×29 mm (2.165×4.724×1.142 in) with a 32.5 mm radial section height, C 50.7 kN, C0 18 kN and Pu 0.92 kN. The open 1311 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 55 mm shaft. Reference (thermal) speed 11000 r/min, limiting speed 7500 r/min, catalogue mass 1600 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.92 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The spherical outer raceway lets 1311-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The ETN9 suffix on 1311-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 55 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 1311-ETN9 (C 50.7 kN, C0 18 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1311-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1311-ETN9?",
        "a": "SKF 1311 ETN9 measures 55 mm bore × 120 mm OD × 29 mm width (2.165 × 4.724 × 1.142 in), mass about 1600 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1311 work?",
        "a": "The final two digits of 1311 are bore code 11, multiplied by 5 to give 55 mm."
      },
      {
        "q": "What is the speed rating of 1311-ETN9?",
        "a": "SKF lists a 11000 r/min thermal reference speed and a 7500 r/min mechanical limiting speed for 1311 ETN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1311-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1311-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1311",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1311-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 1311 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1311-ETN9",
      "1311 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1311-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1311 EKTN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 50.7,
    "static_load_kN": 18,
    "fatigue_load_limit_kN": 0.92,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 1600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1311 carries code 11 = 55 mm (code × 5). Envelope 55×120×29 mm (2.165×4.724×1.142 in) with a 32.5 mm radial section height, C 50.7 kN, C0 18 kN and Pu 0.92 kN. The open 1311 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 11000 r/min, limiting speed 7500 r/min, catalogue mass 1600 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 55 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the 1311-EKTN9 chamfer so the 29 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "On a sleeve-mounted 1311-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 1311-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 1311-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.92 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1311-EKTN9?",
        "a": "SKF 1311 EKTN9 measures 55 mm bore × 120 mm OD × 29 mm width (2.165 × 4.724 × 1.142 in), mass about 1600 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1311 work?",
        "a": "The final two digits of 1311 are bore code 11, multiplied by 5 to give 55 mm."
      },
      {
        "q": "Which fits should I use for 1311-EKTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 120 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 1311-EKTN9?",
        "a": "Catalogue mass is 1600 g for 1311 EKTN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1311",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1311-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 1311 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1311-EKTN9",
      "1311 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2311-K",
    "brand": "SKF",
    "manufacturer_designation": "2311 K",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 76.1,
    "static_load_kN": 24,
    "fatigue_load_limit_kN": 1.25,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2311 carries code 11 = 55 mm (code × 5). Envelope 55×120×43 mm (2.165×4.724×1.693 in) with a 32.5 mm radial section height, C 76.1 kN, C0 24 kN and Pu 1.25 kN. The open 2311 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 11000 r/min, limiting speed 7500 r/min, catalogue mass 2100 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 2311-K (C 76.1 kN, C0 24 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Catalogue ratings for 2311-K (C 76.1 kN, C0 24 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The K suffix means a 1:12 tapered bore: 2311-K is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The  suffix on 2311-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 2311-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2311-K chamfer so the 43 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2311-K?",
        "a": "SKF 2311 K measures 55 mm bore × 120 mm OD × 43 mm width (2.165 × 4.724 × 1.693 in), mass about 2100 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2311 work?",
        "a": "The final two digits of 2311 are bore code 11, multiplied by 5 to give 55 mm."
      },
      {
        "q": "How heavy is 2311-K?",
        "a": "Catalogue mass is 2100 g for 2311 K; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2311-K take?",
        "a": "Catalogue values for 2311 K: dynamic C 76.1 kN, static C0 24 kN, fatigue limit Pu 1.25 kN. Use C in life calculation and C0 for static checks at 55 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2311",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2311-K",
      "2311 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1212-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1212 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 31.2,
    "static_load_kN": 12.2,
    "fatigue_load_limit_kN": 0.62,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1212 carries code 12 = 60 mm (code × 5). Envelope 60×110×22 mm (2.362×4.331×0.866 in) with a 25.0 mm radial section height, C 31.2 kN, C0 12.2 kN and Pu 0.62 kN. The open 1212 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 60 mm shaft. Reference (thermal) speed 12000 r/min, limiting speed 8500 r/min, catalogue mass 900 g.",
    "applications": [
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 1212-ETN9 (C 31.2 kN, C0 12.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1212-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The ETN9 suffix on 1212-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 8500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 1212-ETN9 chamfer so the 22 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1212-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 60 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1212-ETN9?",
        "a": "SKF 1212 ETN9 measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 900 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1212 work?",
        "a": "The final two digits of 1212 are bore code 12, multiplied by 5 to give 60 mm."
      },
      {
        "q": "How heavy is 1212-ETN9?",
        "a": "Catalogue mass is 900 g for 1212 ETN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 1212-ETN9 take?",
        "a": "Catalogue values for 1212 ETN9: dynamic C 31.2 kN, static C0 12.2 kN, fatigue limit Pu 0.62 kN. Use C in life calculation and C0 for static checks at 60 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1212",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1212-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 1212 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11212-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 11212 TN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1212-ETN9",
      "1212 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1212-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1212 EKTN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 31.2,
    "static_load_kN": 12.2,
    "fatigue_load_limit_kN": 0.62,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1212 carries code 12 = 60 mm (code × 5). Envelope 60×110×22 mm (2.362×4.331×0.866 in) with a 25.0 mm radial section height, C 31.2 kN, C0 12.2 kN and Pu 0.62 kN. The open 1212 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 12000 r/min, limiting speed 8500 r/min, catalogue mass 900 g.",
    "applications": [
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 1212-EKTN9 chamfer so the 22 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring: on a 60 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The EKTN9 suffix on 1212-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 8500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 60 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 1212-EKTN9 (C 31.2 kN, C0 12.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1212-EKTN9?",
        "a": "SKF 1212 EKTN9 measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 900 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1212 work?",
        "a": "The final two digits of 1212 are bore code 12, multiplied by 5 to give 60 mm."
      },
      {
        "q": "What load can 1212-EKTN9 take?",
        "a": "Catalogue values for 1212 EKTN9: dynamic C 31.2 kN, static C0 12.2 kN, fatigue limit Pu 0.62 kN. Use C in life calculation and C0 for static checks at 60 mm bore."
      },
      {
        "q": "What is the speed rating of 1212-EKTN9?",
        "a": "SKF lists a 12000 r/min thermal reference speed and a 8500 r/min mechanical limiting speed for 1212 EKTN9; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1212",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1212-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 1212 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "11212-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 11212 TN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1212-EKTN9",
      "1212 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2212-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2212 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 31.2,
    "static_load_kN": 12.2,
    "fatigue_load_limit_kN": 0.62,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2212 carries code 12 = 60 mm (code × 5). Envelope 60×110×28 mm (2.362×4.331×1.102 in) with a 25.0 mm radial section height, C 31.2 kN, C0 12.2 kN and Pu 0.62 kN. SKF spells the sealed execution 2212 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 60 mm shaft. Limiting speed 3800 r/min, catalogue mass 1050 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 2212-E-2RS1TN9 (C 31.2 kN, C0 12.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Catalogue ratings for 2212-E-2RS1TN9 (C 31.2 kN, C0 12.2 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2212-E-2RS1TN9 to avoid seal-lip binding.",
      "The E-2RS1TN9 suffix on 2212-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 3800 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 2212-E-2RS1TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2212-E-2RS1TN9 chamfer so the 28 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2212-E-2RS1TN9?",
        "a": "SKF 2212 E-2RS1TN9 measures 60 mm bore × 110 mm OD × 28 mm width (2.362 × 4.331 × 1.102 in), mass about 1050 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2212 work?",
        "a": "The final two digits of 2212 are bore code 12, multiplied by 5 to give 60 mm."
      },
      {
        "q": "How heavy is 2212-E-2RS1TN9?",
        "a": "Catalogue mass is 1050 g for 2212 E-2RS1TN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2212-E-2RS1TN9 take?",
        "a": "Catalogue values for 2212 E-2RS1TN9: dynamic C 31.2 kN, static C0 12.2 kN, fatigue limit Pu 0.62 kN. Use C in life calculation and C0 for static checks at 60 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2212",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2212-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×28 mm envelope with catalogue ratings within 10 %; 2212 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2212-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between executions (31.2/12.2 kN vs 48.8/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2212-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between executions (31.2/12.2 kN vs 48.8/17 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2212-E-2RS1TN9",
      "2212 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2212-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2212 E-2RS1KTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 31.2,
    "static_load_kN": 12.2,
    "fatigue_load_limit_kN": 0.62,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2212 carries code 12 = 60 mm (code × 5). Envelope 60×110×28 mm (2.362×4.331×1.102 in) with a 25.0 mm radial section height, C 31.2 kN, C0 12.2 kN and Pu 0.62 kN. SKF spells the sealed execution 2212 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 3800 r/min, catalogue mass 1050 g.",
    "applications": [
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2212-E-2RS1KTN9 chamfer so the 28 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Mount 2212-E-2RS1KTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2212-E-2RS1KTN9 to avoid seal-lip binding.",
      "The K suffix means a 1:12 tapered bore: 2212-E-2RS1KTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The E-2RS1KTN9 suffix on 2212-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 3800 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2212-E-2RS1KTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2212-E-2RS1KTN9?",
        "a": "SKF 2212 E-2RS1KTN9 measures 60 mm bore × 110 mm OD × 28 mm width (2.362 × 4.331 × 1.102 in), mass about 1050 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2212 work?",
        "a": "The final two digits of 2212 are bore code 12, multiplied by 5 to give 60 mm."
      },
      {
        "q": "How much misalignment can 2212-E-2RS1KTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2212-E-2RS1KTN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2212-E-2RS1KTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2212",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2212-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×28 mm envelope with catalogue ratings within 10 %; 2212 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2212-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between executions (31.2/12.2 kN vs 48.8/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2212-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between executions (31.2/12.2 kN vs 48.8/17 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2212-E-2RS1KTN9",
      "2212 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2212-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2212 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 48.8,
    "static_load_kN": 17,
    "fatigue_load_limit_kN": 0.88,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2212 carries code 12 = 60 mm (code × 5). Envelope 60×110×28 mm (2.362×4.331×1.102 in) with a 25.0 mm radial section height, C 48.8 kN, C0 17 kN and Pu 0.88 kN. The open 2212 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 60 mm shaft. Reference (thermal) speed 11000 r/min, limiting speed 8000 r/min, catalogue mass 1100 g.",
    "applications": [
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 2212-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Mount 2212-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The ETN9 suffix on 2212-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 8000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 2212-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 2212-ETN9 chamfer so the 28 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2212-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2212-ETN9?",
        "a": "SKF 2212 ETN9 measures 60 mm bore × 110 mm OD × 28 mm width (2.362 × 4.331 × 1.102 in), mass about 1100 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2212 work?",
        "a": "The final two digits of 2212 are bore code 12, multiplied by 5 to give 60 mm."
      },
      {
        "q": "Which fits should I use for 2212-ETN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 110 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2212-ETN9?",
        "a": "Catalogue mass is 1100 g for 2212 ETN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2212",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2212-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between executions (48.8/17 kN vs 31.2/12.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2212-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between executions (48.8/17 kN vs 31.2/12.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2212-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×28 mm envelope with catalogue ratings within 10 %; 2212 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2212-ETN9",
      "2212 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2212-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2212 EKTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 48.8,
    "static_load_kN": 17,
    "fatigue_load_limit_kN": 0.88,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2212 carries code 12 = 60 mm (code × 5). Envelope 60×110×28 mm (2.362×4.331×1.102 in) with a 25.0 mm radial section height, C 48.8 kN, C0 17 kN and Pu 0.88 kN. The open 2212 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 11000 r/min, limiting speed 8000 r/min, catalogue mass 1100 g.",
    "applications": [
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.88 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2212-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "On a sleeve-mounted 2212-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 2212-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 8000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.88 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 60 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2212-EKTN9?",
        "a": "SKF 2212 EKTN9 measures 60 mm bore × 110 mm OD × 28 mm width (2.362 × 4.331 × 1.102 in), mass about 1100 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2212 work?",
        "a": "The final two digits of 2212 are bore code 12, multiplied by 5 to give 60 mm."
      },
      {
        "q": "What is the speed rating of 2212-EKTN9?",
        "a": "SKF lists a 11000 r/min thermal reference speed and a 8000 r/min mechanical limiting speed for 2212 EKTN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 2212-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2212-EKTN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2212",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2212-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between executions (48.8/17 kN vs 31.2/12.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2212-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope, but catalogue C/C0 differ between executions (48.8/17 kN vs 31.2/12.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2212-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×28 mm envelope with catalogue ratings within 10 %; 2212 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2212-EKTN9",
      "2212 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1312-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1312 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 22,
    "fatigue_load_limit_kN": 1.12,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1312 carries code 12 = 60 mm (code × 5). Envelope 60×130×31 mm (2.362×5.118×1.22 in) with a 35.0 mm radial section height, C 58.5 kN, C0 22 kN and Pu 1.12 kN. The open 1312 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 60 mm shaft. Reference (thermal) speed 9000 r/min, limiting speed 6300 r/min, catalogue mass 1950 g.",
    "applications": [
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 1312-ETN9 chamfer so the 31 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Mount 1312-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The ETN9 suffix on 1312-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 1312-ETN9 (C 58.5 kN, C0 22 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1312-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 1.12 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1312-ETN9?",
        "a": "SKF 1312 ETN9 measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 1950 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1312 work?",
        "a": "The final two digits of 1312 are bore code 12, multiplied by 5 to give 60 mm."
      },
      {
        "q": "How much misalignment can 1312-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1312-ETN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 1312-ETN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1312",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1312-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 1312 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1312-ETN9",
      "1312 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1312-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1312 EKTN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 22,
    "fatigue_load_limit_kN": 1.12,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1312 carries code 12 = 60 mm (code × 5). Envelope 60×130×31 mm (2.362×5.118×1.22 in) with a 35.0 mm radial section height, C 58.5 kN, C0 22 kN and Pu 1.12 kN. The open 1312 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 9000 r/min, limiting speed 6300 r/min, catalogue mass 1950 g.",
    "applications": [
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1312-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1312-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "On a sleeve-mounted 1312-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 1312-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1312-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 60 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1312-EKTN9?",
        "a": "SKF 1312 EKTN9 measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 1950 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1312 work?",
        "a": "The final two digits of 1312 are bore code 12, multiplied by 5 to give 60 mm."
      },
      {
        "q": "What is the speed rating of 1312-EKTN9?",
        "a": "SKF lists a 9000 r/min thermal reference speed and a 6300 r/min mechanical limiting speed for 1312 EKTN9; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1312-EKTN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1312-EKTN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1312",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1312-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 1312 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1312-EKTN9",
      "1312 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2312-K",
    "brand": "SKF",
    "manufacturer_designation": "2312 K",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 87.1,
    "static_load_kN": 28.5,
    "fatigue_load_limit_kN": 1.46,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 2600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2312 carries code 12 = 60 mm (code × 5). Envelope 60×130×46 mm (2.362×5.118×1.811 in) with a 35.0 mm radial section height, C 87.1 kN, C0 28.5 kN and Pu 1.46 kN. The open 2312 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 9500 r/min, limiting speed 7000 r/min, catalogue mass 2600 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2312-K chamfer so the 46 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "At 60 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The K suffix means a 1:12 tapered bore: 2312-K is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The  suffix on 2312-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 60 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 2312-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2312-K?",
        "a": "SKF 2312 K measures 60 mm bore × 130 mm OD × 46 mm width (2.362 × 5.118 × 1.811 in), mass about 2600 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2312 work?",
        "a": "The final two digits of 2312 are bore code 12, multiplied by 5 to give 60 mm."
      },
      {
        "q": "How much misalignment can 2312-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2312-K allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2312-K take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2312",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2312-K",
      "2312 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1213-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1213 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 35.1,
    "static_load_kN": 14,
    "fatigue_load_limit_kN": 0.72,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1213 carries code 13 = 65 mm (code × 5). Envelope 65×120×23 mm (2.559×4.724×0.906 in) with a 27.5 mm radial section height, C 35.1 kN, C0 14 kN and Pu 0.72 kN. The open 1213 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 65 mm shaft. Reference (thermal) speed 11000 r/min, limiting speed 7000 r/min, catalogue mass 1150 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 1213-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Fillet radii must clear the 1213-ETN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The ETN9 suffix on 1213-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 1213-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 1213-ETN9 chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1213-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1213-ETN9?",
        "a": "SKF 1213 ETN9 measures 65 mm bore × 120 mm OD × 23 mm width (2.559 × 4.724 × 0.906 in), mass about 1150 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1213 work?",
        "a": "The final two digits of 1213 are bore code 13, multiplied by 5 to give 65 mm."
      },
      {
        "q": "Which fits should I use for 1213-ETN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 120 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 1213-ETN9?",
        "a": "Catalogue mass is 1150 g for 1213 ETN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1213",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1213-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 1213 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1213-ETN9",
      "1213 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1213-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1213 EKTN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 35.1,
    "static_load_kN": 14,
    "fatigue_load_limit_kN": 0.72,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1213 carries code 13 = 65 mm (code × 5). Envelope 65×120×23 mm (2.559×4.724×0.906 in) with a 27.5 mm radial section height, C 35.1 kN, C0 14 kN and Pu 0.72 kN. The open 1213 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 11000 r/min, limiting speed 7000 r/min, catalogue mass 1150 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.72 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The fatigue load limit is 0.72 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The EKTN9 suffix on 1213-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.72 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 65 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1213-EKTN9?",
        "a": "SKF 1213 EKTN9 measures 65 mm bore × 120 mm OD × 23 mm width (2.559 × 4.724 × 0.906 in), mass about 1150 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1213 work?",
        "a": "The final two digits of 1213 are bore code 13, multiplied by 5 to give 65 mm."
      },
      {
        "q": "Can 1213-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 1213-EKTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 120 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1213",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1213-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 1213 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1213-EKTN9",
      "1213 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2213-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2213 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 35.1,
    "static_load_kN": 14,
    "fatigue_load_limit_kN": 0.72,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 1400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2213 carries code 13 = 65 mm (code × 5). Envelope 65×120×31 mm (2.559×4.724×1.22 in) with a 27.5 mm radial section height, C 35.1 kN, C0 14 kN and Pu 0.72 kN. SKF spells the sealed execution 2213 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 65 mm shaft. Limiting speed 3600 r/min, catalogue mass 1400 g.",
    "applications": [
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives"
    ],
    "failure_modes": [
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 65 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Mount 2213-E-2RS1TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Do not wash 2213-E-2RS1TN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.",
      "The E-2RS1TN9 suffix on 2213-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 3600 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2213-E-2RS1TN9 chamfer so the 31 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2213-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2213-E-2RS1TN9?",
        "a": "SKF 2213 E-2RS1TN9 measures 65 mm bore × 120 mm OD × 31 mm width (2.559 × 4.724 × 1.22 in), mass about 1400 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2213 work?",
        "a": "The final two digits of 2213 are bore code 13, multiplied by 5 to give 65 mm."
      },
      {
        "q": "Which fits should I use for 2213-E-2RS1TN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 120 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2213-E-2RS1TN9?",
        "a": "Catalogue mass is 1400 g for 2213 E-2RS1TN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2213",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2213-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×31 mm envelope with catalogue ratings within 10 %; 2213 E-2RS1KTN9 is the glass-fibre PA66 cage, two contact elastomer seals, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2213-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between executions (35.1/14 kN vs 57.2/20 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2213-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between executions (35.1/14 kN vs 57.2/20 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2213-E-2RS1TN9",
      "2213 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2213-E-2RS1KTN9",
    "brand": "SKF",
    "manufacturer_designation": "2213 E-2RS1KTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 35.1,
    "static_load_kN": 14,
    "fatigue_load_limit_kN": 0.72,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 1400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2213 carries code 13 = 65 mm (code × 5). Envelope 65×120×31 mm (2.559×4.724×1.22 in) with a 27.5 mm radial section height, C 35.1 kN, C0 14 kN and Pu 0.72 kN. SKF spells the sealed execution 2213 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 3600 r/min, catalogue mass 1400 g.",
    "applications": [
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture passing a worn seal lip in dirty or wet duty",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 2213-E-2RS1KTN9 (C 35.1 kN, C0 14 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2213-E-2RS1KTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Sealed self-aligning bearings tolerate less misalignment than open ones: keep static misalignment under roughly 1° on 2213-E-2RS1KTN9 to avoid seal-lip binding.",
      "The K suffix means a 1:12 tapered bore: 2213-E-2RS1KTN9 is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The E-2RS1KTN9 suffix on 2213-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 3600 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 65 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2213-E-2RS1KTN9?",
        "a": "SKF 2213 E-2RS1KTN9 measures 65 mm bore × 120 mm OD × 31 mm width (2.559 × 4.724 × 1.22 in), mass about 1400 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2213 work?",
        "a": "The final two digits of 2213 are bore code 13, multiplied by 5 to give 65 mm."
      },
      {
        "q": "How heavy is 2213-E-2RS1KTN9?",
        "a": "Catalogue mass is 1400 g for 2213 E-2RS1KTN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2213-E-2RS1KTN9 take?",
        "a": "Catalogue values for 2213 E-2RS1KTN9: dynamic C 35.1 kN, static C0 14 kN, fatigue limit Pu 0.72 kN. Use C in life calculation and C0 for static checks at 65 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2213",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2213-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×31 mm envelope with catalogue ratings within 10 %; 2213 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "2213-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between executions (35.1/14 kN vs 57.2/20 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2213-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between executions (35.1/14 kN vs 57.2/20 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2213-E-2RS1KTN9",
      "2213 E-2RS1KTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2213-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2213 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 57.2,
    "static_load_kN": 20,
    "fatigue_load_limit_kN": 1.02,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2213 carries code 13 = 65 mm (code × 5). Envelope 65×120×31 mm (2.559×4.724×1.22 in) with a 27.5 mm radial section height, C 57.2 kN, C0 20 kN and Pu 1.02 kN. The open 2213 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 65 mm shaft. Reference (thermal) speed 10000 r/min, limiting speed 7000 r/min, catalogue mass 1450 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 2213-ETN9 (C 57.2 kN, C0 20 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The fatigue load limit is 1.02 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The ETN9 suffix on 2213-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2213-ETN9 chamfer so the 31 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2213-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 65 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2213-ETN9?",
        "a": "SKF 2213 ETN9 measures 65 mm bore × 120 mm OD × 31 mm width (2.559 × 4.724 × 1.22 in), mass about 1450 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2213 work?",
        "a": "The final two digits of 2213 are bore code 13, multiplied by 5 to give 65 mm."
      },
      {
        "q": "Can 2213-ETN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2213-ETN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 120 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2213",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2213-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between executions (57.2/20 kN vs 35.1/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2213-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between executions (57.2/20 kN vs 35.1/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2213-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×31 mm envelope with catalogue ratings within 10 %; 2213 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2213-ETN9",
      "2213 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2213-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2213 EKTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 57.2,
    "static_load_kN": 20,
    "fatigue_load_limit_kN": 1.02,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2213 carries code 13 = 65 mm (code × 5). Envelope 65×120×31 mm (2.559×4.724×1.22 in) with a 27.5 mm radial section height, C 57.2 kN, C0 20 kN and Pu 1.02 kN. The open 2213 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 10000 r/min, limiting speed 7000 r/min, catalogue mass 1450 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2213-EKTN9 chamfer so the 31 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "At 65 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "On a sleeve-mounted 2213-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 2213-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 65 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2213-EKTN9 (C 57.2 kN, C0 20 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2213-EKTN9?",
        "a": "SKF 2213 EKTN9 measures 65 mm bore × 120 mm OD × 31 mm width (2.559 × 4.724 × 1.22 in), mass about 1450 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2213 work?",
        "a": "The final two digits of 2213 are bore code 13, multiplied by 5 to give 65 mm."
      },
      {
        "q": "Which fits should I use for 2213-EKTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 120 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2213-EKTN9?",
        "a": "Catalogue mass is 1450 g for 2213 EKTN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2213",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2213-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between executions (57.2/20 kN vs 35.1/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2213-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope, but catalogue C/C0 differ between executions (57.2/20 kN vs 35.1/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "2213-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×31 mm envelope with catalogue ratings within 10 %; 2213 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2213-EKTN9",
      "2213 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1313-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1313 ETN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 65,
    "static_load_kN": 25.5,
    "fatigue_load_limit_kN": 1.25,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 2450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1313 carries code 13 = 65 mm (code × 5). Envelope 65×140×33 mm (2.559×5.512×1.299 in) with a 37.5 mm radial section height, C 65 kN, C0 25.5 kN and Pu 1.25 kN. The open 1313 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 65 mm shaft. Reference (thermal) speed 8500 r/min, limiting speed 6000 r/min, catalogue mass 2450 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 1313-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The fatigue load limit is 1.25 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The ETN9 suffix on 1313-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 1313-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 1.25 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 65 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1313-ETN9?",
        "a": "SKF 1313 ETN9 measures 65 mm bore × 140 mm OD × 33 mm width (2.559 × 5.512 × 1.299 in), mass about 2450 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1313 work?",
        "a": "The final two digits of 1313 are bore code 13, multiplied by 5 to give 65 mm."
      },
      {
        "q": "How heavy is 1313-ETN9?",
        "a": "Catalogue mass is 2450 g for 1313 ETN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 1313-ETN9 take?",
        "a": "Catalogue values for 1313 ETN9: dynamic C 65 kN, static C0 25.5 kN, fatigue limit Pu 1.25 kN. Use C in life calculation and C0 for static checks at 65 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1313",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1313-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 1313 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1313-ETN9",
      "1313 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1313-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "1313 EKTN9",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 65,
    "static_load_kN": 25.5,
    "fatigue_load_limit_kN": 1.25,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 2450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1313 carries code 13 = 65 mm (code × 5). Envelope 65×140×33 mm (2.559×5.512×1.299 in) with a 37.5 mm radial section height, C 65 kN, C0 25.5 kN and Pu 1.25 kN. The open 1313 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 8500 r/min, limiting speed 6000 r/min, catalogue mass 2450 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 1313-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "At 65 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "On a sleeve-mounted 1313-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 1313-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 65 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 1313-EKTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1313-EKTN9?",
        "a": "SKF 1313 EKTN9 measures 65 mm bore × 140 mm OD × 33 mm width (2.559 × 5.512 × 1.299 in), mass about 2450 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1313 work?",
        "a": "The final two digits of 1313 are bore code 13, multiplied by 5 to give 65 mm."
      },
      {
        "q": "Which fits should I use for 1313-EKTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 140 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 1313-EKTN9?",
        "a": "Catalogue mass is 2450 g for 1313 EKTN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1313",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1313-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 1313 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1313-EKTN9",
      "1313 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2313-K",
    "brand": "SKF",
    "manufacturer_designation": "2313 K",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 95.6,
    "static_load_kN": 32.5,
    "fatigue_load_limit_kN": 1.66,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 3250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2313 carries code 13 = 65 mm (code × 5). Envelope 65×140×48 mm (2.559×5.512×1.89 in) with a 37.5 mm radial section height, C 95.6 kN, C0 32.5 kN and Pu 1.66 kN. The open 2313 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 9000 r/min, limiting speed 6300 r/min, catalogue mass 3250 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2313-K (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The fatigue load limit is 1.66 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The K suffix means a 1:12 tapered bore: 2313-K is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The  suffix on 2313-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 1.66 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 65 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2313-K?",
        "a": "SKF 2313 K measures 65 mm bore × 140 mm OD × 48 mm width (2.559 × 5.512 × 1.89 in), mass about 3250 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2313 work?",
        "a": "The final two digits of 2313 are bore code 13, multiplied by 5 to give 65 mm."
      },
      {
        "q": "How heavy is 2313-K?",
        "a": "Catalogue mass is 3250 g for 2313 K; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2313-K take?",
        "a": "Catalogue values for 2313 K: dynamic C 95.6 kN, static C0 32.5 kN, fatigue limit Pu 1.66 kN. Use C in life calculation and C0 for static checks at 65 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2313",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2313-K",
      "2313 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1214-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "1214 ETN9",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 35.8,
    "static_load_kN": 14.6,
    "fatigue_load_limit_kN": 0.75,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 1250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1214 carries code 14 = 70 mm (code × 5). Envelope 70×125×24 mm (2.756×4.921×0.945 in) with a 27.5 mm radial section height, C 35.8 kN, C0 14.6 kN and Pu 0.75 kN. The open 1214 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 70 mm shaft. Reference (thermal) speed 11000 r/min, limiting speed 7000 r/min, catalogue mass 1250 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.75 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The spherical outer raceway lets 1214-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The ETN9 suffix on 1214-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 70 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 1214-ETN9 (C 35.8 kN, C0 14.6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1214-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1214-ETN9?",
        "a": "SKF 1214 ETN9 measures 70 mm bore × 125 mm OD × 24 mm width (2.756 × 4.921 × 0.945 in), mass about 1250 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1214 work?",
        "a": "The final two digits of 1214 are bore code 14, multiplied by 5 to give 70 mm."
      },
      {
        "q": "How heavy is 1214-ETN9?",
        "a": "Catalogue mass is 1250 g for 1214 ETN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 1214-ETN9 take?",
        "a": "Catalogue values for 1214 ETN9: dynamic C 35.8 kN, static C0 14.6 kN, fatigue limit Pu 0.75 kN. Use C in life calculation and C0 for static checks at 70 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1214",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1214-ETN9",
      "1214 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2214-E-2RS1TN9",
    "brand": "SKF",
    "manufacturer_designation": "2214 E-2RS1TN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 35.8,
    "static_load_kN": 14.6,
    "fatigue_load_limit_kN": 0.75,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2214 carries code 14 = 70 mm (code × 5). Envelope 70×125×31 mm (2.756×4.921×1.22 in) with a 27.5 mm radial section height, C 35.8 kN, C0 14.6 kN and Pu 0.75 kN. SKF spells the sealed execution 2214 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 70 mm shaft. Limiting speed 3400 r/min, catalogue mass 1450 g.",
    "applications": [
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.75 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2214-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The 2RS1 contact seals on 2214-E-2RS1TN9 add drag and cap speed at 3400 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "The E-2RS1TN9 suffix on 2214-E-2RS1TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 3400 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2214-E-2RS1TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 70 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2214-E-2RS1TN9?",
        "a": "SKF 2214 E-2RS1TN9 measures 70 mm bore × 125 mm OD × 31 mm width (2.756 × 4.921 × 1.22 in), mass about 1450 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How does the bore code in 2214 work?",
        "a": "The final two digits of 2214 are bore code 14, multiplied by 5 to give 70 mm."
      },
      {
        "q": "Can 2214-E-2RS1TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2214-E-2RS1TN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 125 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2214",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×31 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2214-E-2RS1TN9",
      "2214 E-2RS1TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1215-K",
    "brand": "SKF",
    "manufacturer_designation": "1215 K",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39,
    "static_load_kN": 15.6,
    "fatigue_load_limit_kN": 0.8,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 1350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1215 carries code 15 = 75 mm (code × 5). Envelope 75×130×25 mm (2.953×5.118×0.984 in) with a 27.5 mm radial section height, C 39 kN, C0 15.6 kN and Pu 0.8 kN. The open 1215 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 10000 r/min, limiting speed 6700 r/min, catalogue mass 1350 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 1215-K (C 39 kN, C0 15.6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The spherical outer raceway lets 1215-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "On a sleeve-mounted 1215-K, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The  suffix on 1215-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6700 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 1215-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 1215-K chamfer so the 25 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1215-K?",
        "a": "SKF 1215 K measures 75 mm bore × 130 mm OD × 25 mm width (2.953 × 5.118 × 0.984 in), mass about 1350 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1215 work?",
        "a": "The final two digits of 1215 are bore code 15, multiplied by 5 to give 75 mm."
      },
      {
        "q": "What is the speed rating of 1215-K?",
        "a": "SKF lists a 10000 r/min thermal reference speed and a 6700 r/min mechanical limiting speed for 1215 K; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1215-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1215-K allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1215",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1215-K",
      "1215 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2215-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2215 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 22,
    "fatigue_load_limit_kN": 1.12,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2215 carries code 15 = 75 mm (code × 5). Envelope 75×130×31 mm (2.953×5.118×1.22 in) with a 27.5 mm radial section height, C 58.5 kN, C0 22 kN and Pu 1.12 kN. The open 2215 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 75 mm shaft. Reference (thermal) speed 9000 r/min, limiting speed 6300 r/min, catalogue mass 1600 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 1.12 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Catalogue ratings for 2215-ETN9 (C 58.5 kN, C0 22 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The ETN9 suffix on 2215-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 75 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2215-ETN9 (C 58.5 kN, C0 22 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 2215-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2215-ETN9?",
        "a": "SKF 2215 ETN9 measures 75 mm bore × 130 mm OD × 31 mm width (2.953 × 5.118 × 1.22 in), mass about 1600 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2215 work?",
        "a": "The final two digits of 2215 are bore code 15, multiplied by 5 to give 75 mm."
      },
      {
        "q": "How heavy is 2215-ETN9?",
        "a": "Catalogue mass is 1600 g for 2215 ETN9; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2215-ETN9 take?",
        "a": "Catalogue values for 2215 ETN9: dynamic C 58.5 kN, static C0 22 kN, fatigue limit Pu 1.12 kN. Use C in life calculation and C0 for static checks at 75 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2215",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2215-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×31 mm envelope with catalogue ratings within 10 %; 2215 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2215-ETN9",
      "2215 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2215-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2215 EKTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 22,
    "fatigue_load_limit_kN": 1.12,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2215 carries code 15 = 75 mm (code × 5). Envelope 75×130×31 mm (2.953×5.118×1.22 in) with a 27.5 mm radial section height, C 58.5 kN, C0 22 kN and Pu 1.12 kN. The open 2215 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 9000 r/min, limiting speed 6300 r/min, catalogue mass 1600 g.",
    "applications": [
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 75 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Mount 2215-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "On a sleeve-mounted 2215-EKTN9, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The EKTN9 suffix on 2215-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 2215-EKTN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 1.12 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2215-EKTN9?",
        "a": "SKF 2215 EKTN9 measures 75 mm bore × 130 mm OD × 31 mm width (2.953 × 5.118 × 1.22 in), mass about 1600 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2215 work?",
        "a": "The final two digits of 2215 are bore code 15, multiplied by 5 to give 75 mm."
      },
      {
        "q": "Which fits should I use for 2215-EKTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 130 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2215-EKTN9?",
        "a": "Catalogue mass is 1600 g for 2215 EKTN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2215",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2215-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×31 mm envelope with catalogue ratings within 10 %; 2215 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2215-EKTN9",
      "2215 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1315-K",
    "brand": "SKF",
    "manufacturer_designation": "1315 K",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 79.3,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 1.43,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 3550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1315 carries code 15 = 75 mm (code × 5). Envelope 75×160×37 mm (2.953×6.299×1.457 in) with a 42.5 mm radial section height, C 79.3 kN, C0 30 kN and Pu 1.43 kN. The open 1315 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 8000 r/min, limiting speed 5600 r/min, catalogue mass 3550 g.",
    "applications": [
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 75 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Mount 1315-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The  suffix on 1315-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5600 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 1315-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 1.43 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1315-K?",
        "a": "SKF 1315 K measures 75 mm bore × 160 mm OD × 37 mm width (2.953 × 6.299 × 1.457 in), mass about 3550 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1315 work?",
        "a": "The final two digits of 1315 are bore code 15, multiplied by 5 to give 75 mm."
      },
      {
        "q": "What load can 1315-K take?",
        "a": "Catalogue values for 1315 K: dynamic C 79.3 kN, static C0 30 kN, fatigue limit Pu 1.43 kN. Use C in life calculation and C0 for static checks at 75 mm bore."
      },
      {
        "q": "What is the speed rating of 1315-K?",
        "a": "SKF lists a 8000 r/min thermal reference speed and a 5600 r/min mechanical limiting speed for 1315 K; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1315",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1315-K",
      "1315 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2315-K",
    "brand": "SKF",
    "manufacturer_designation": "2315 K",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 124,
    "static_load_kN": 43,
    "fatigue_load_limit_kN": 2.04,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 4700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2315 carries code 15 = 75 mm (code × 5). Envelope 75×160×55 mm (2.953×6.299×2.165 in) with a 42.5 mm radial section height, C 124 kN, C0 43 kN and Pu 2.04 kN. The open 2315 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 7500 r/min, limiting speed 5600 r/min, catalogue mass 4700 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2315-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The spherical outer raceway lets 2315-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "On a sleeve-mounted 2315-K, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The  suffix on 2315-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5600 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 2315-K (C 124 kN, C0 43 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 2315-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2315-K?",
        "a": "SKF 2315 K measures 75 mm bore × 160 mm OD × 55 mm width (2.953 × 6.299 × 2.165 in), mass about 4700 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2315 work?",
        "a": "The final two digits of 2315 are bore code 15, multiplied by 5 to give 75 mm."
      },
      {
        "q": "What is the speed rating of 2315-K?",
        "a": "SKF lists a 7500 r/min thermal reference speed and a 5600 r/min mechanical limiting speed for 2315 K; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 2315-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2315-K allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2315",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2315-K",
      "2315 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1216-K",
    "brand": "SKF",
    "manufacturer_designation": "1216 K",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39.7,
    "static_load_kN": 17,
    "fatigue_load_limit_kN": 0.83,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 1650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1216 carries code 16 = 80 mm (code × 5). Envelope 80×140×26 mm (3.15×5.512×1.024 in) with a 30.0 mm radial section height, C 39.7 kN, C0 17 kN and Pu 0.83 kN. The open 1216 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 9500 r/min, limiting speed 6000 r/min, catalogue mass 1650 g.",
    "applications": [
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 1216-K chamfer so the 26 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring: on a 80 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "On a sleeve-mounted 1216-K, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The  suffix on 1216-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 80 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 1216-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1216-K?",
        "a": "SKF 1216 K measures 80 mm bore × 140 mm OD × 26 mm width (3.15 × 5.512 × 1.024 in), mass about 1650 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1216 work?",
        "a": "The final two digits of 1216 are bore code 16, multiplied by 5 to give 80 mm."
      },
      {
        "q": "Which fits should I use for 1216-K?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 140 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 1216-K?",
        "a": "Catalogue mass is 1650 g for 1216 K; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1216",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1216-K",
      "1216 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2216-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "2216 ETN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 65,
    "static_load_kN": 25.5,
    "fatigue_load_limit_kN": 1.25,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 2000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2216 carries code 16 = 80 mm (code × 5). Envelope 80×140×33 mm (3.15×5.512×1.299 in) with a 30.0 mm radial section height, C 65 kN, C0 25.5 kN and Pu 1.25 kN. The open 2216 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 80 mm shaft. Reference (thermal) speed 8500 r/min, limiting speed 6000 r/min, catalogue mass 2000 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2216-ETN9 chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Fillet radii must clear the 2216-ETN9 chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The ETN9 suffix on 2216-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 2216-ETN9 (C 65 kN, C0 25.5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 2216-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 1.25 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2216-ETN9?",
        "a": "SKF 2216 ETN9 measures 80 mm bore × 140 mm OD × 33 mm width (3.15 × 5.512 × 1.299 in), mass about 2000 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2216 work?",
        "a": "The final two digits of 2216 are bore code 16, multiplied by 5 to give 80 mm."
      },
      {
        "q": "How much misalignment can 2216-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2216-ETN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2216-ETN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2216",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2216-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×33 mm envelope with catalogue ratings within 10 %; 2216 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2216-ETN9",
      "2216 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2216-EKTN9",
    "brand": "SKF",
    "manufacturer_designation": "2216 EKTN9",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 65,
    "static_load_kN": 25.5,
    "fatigue_load_limit_kN": 1.25,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 2000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2216 carries code 16 = 80 mm (code × 5). Envelope 80×140×33 mm (3.15×5.512×1.299 in) with a 30.0 mm radial section height, C 65 kN, C0 25.5 kN and Pu 1.25 kN. The open 2216 EKTN9 carries no shields or seals and relies on application lubrication and external sealing. The EKTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 8500 r/min, limiting speed 6000 r/min, catalogue mass 2000 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2216-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The fatigue load limit is 1.25 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The EKTN9 suffix on 2216-EKTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2216-EKTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 80 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2216-EKTN9?",
        "a": "SKF 2216 EKTN9 measures 80 mm bore × 140 mm OD × 33 mm width (3.15 × 5.512 × 1.299 in), mass about 2000 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2216 work?",
        "a": "The final two digits of 2216 are bore code 16, multiplied by 5 to give 80 mm."
      },
      {
        "q": "Can 2216-EKTN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2216-EKTN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 140 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2216",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2216-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×33 mm envelope with catalogue ratings within 10 %; 2216 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2216-EKTN9",
      "2216 EKTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1316-K",
    "brand": "SKF",
    "manufacturer_designation": "1316 K",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 88.4,
    "static_load_kN": 33.5,
    "fatigue_load_limit_kN": 1.5,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 4200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1316 carries code 16 = 80 mm (code × 5). Envelope 80×170×39 mm (3.15×6.693×1.535 in) with a 45.0 mm radial section height, C 88.4 kN, C0 33.5 kN and Pu 1.5 kN. The open 1316 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 7500 r/min, limiting speed 5300 r/min, catalogue mass 4200 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 1.5 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The fatigue load limit is 1.5 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "On a sleeve-mounted 1316-K, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The  suffix on 1316-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1316-K (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 80 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1316-K?",
        "a": "SKF 1316 K measures 80 mm bore × 170 mm OD × 39 mm width (3.15 × 6.693 × 1.535 in), mass about 4200 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1316 work?",
        "a": "The final two digits of 1316 are bore code 16, multiplied by 5 to give 80 mm."
      },
      {
        "q": "What is the speed rating of 1316-K?",
        "a": "SKF lists a 7500 r/min thermal reference speed and a 5300 r/min mechanical limiting speed for 1316 K; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1316-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1316-K allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1316",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1316-K",
      "1316 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2316-K",
    "brand": "SKF",
    "manufacturer_designation": "2316 K",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 135,
    "static_load_kN": 49,
    "fatigue_load_limit_kN": 2.24,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 6100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2316 carries code 16 = 80 mm (code × 5). Envelope 80×170×58 mm (3.15×6.693×2.283 in) with a 45.0 mm radial section height, C 135 kN, C0 49 kN and Pu 2.24 kN. The open 2316 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 7000 r/min, limiting speed 5300 r/min, catalogue mass 6100 g.",
    "applications": [
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 2316-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Assign interference to the rotating ring: on a 80 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The K suffix means a 1:12 tapered bore: 2316-K is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The  suffix on 2316-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 80 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2316-K (C 135 kN, C0 49 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2316-K?",
        "a": "SKF 2316 K measures 80 mm bore × 170 mm OD × 58 mm width (3.15 × 6.693 × 2.283 in), mass about 6100 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2316 work?",
        "a": "The final two digits of 2316 are bore code 16, multiplied by 5 to give 80 mm."
      },
      {
        "q": "How much misalignment can 2316-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2316-K allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2316-K take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2316",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2316-K",
      "2316 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1217-K",
    "brand": "SKF",
    "manufacturer_designation": "1217 K",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 48.8,
    "static_load_kN": 20.8,
    "fatigue_load_limit_kN": 0.98,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 2050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1217 carries code 17 = 85 mm (code × 5). Envelope 85×150×28 mm (3.346×5.906×1.102 in) with a 32.5 mm radial section height, C 48.8 kN, C0 20.8 kN and Pu 0.98 kN. The open 1217 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 9000 r/min, limiting speed 5600 r/min, catalogue mass 2050 g.",
    "applications": [
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1217-K (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1217-K (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "On a sleeve-mounted 1217-K, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The  suffix on 1217-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5600 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.98 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 85 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1217-K?",
        "a": "SKF 1217 K measures 85 mm bore × 150 mm OD × 28 mm width (3.346 × 5.906 × 1.102 in), mass about 2050 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1217 work?",
        "a": "The final two digits of 1217 are bore code 17, multiplied by 5 to give 85 mm."
      },
      {
        "q": "What is the speed rating of 1217-K?",
        "a": "SKF lists a 9000 r/min thermal reference speed and a 5600 r/min mechanical limiting speed for 1217 K; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1217-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1217-K allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1217",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1217-K",
      "1217 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2217-K",
    "brand": "SKF",
    "manufacturer_designation": "2217 K",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 23.6,
    "fatigue_load_limit_kN": 1.12,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 2500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2217 carries code 17 = 85 mm (code × 5). Envelope 85×150×36 mm (3.346×5.906×1.417 in) with a 32.5 mm radial section height, C 58.5 kN, C0 23.6 kN and Pu 1.12 kN. The open 2217 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 8000 r/min, limiting speed 5600 r/min, catalogue mass 2500 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2217-K chamfer so the 36 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "At 85 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "On a sleeve-mounted 2217-K, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The  suffix on 2217-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5600 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 85 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 2217-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2217-K?",
        "a": "SKF 2217 K measures 85 mm bore × 150 mm OD × 36 mm width (3.346 × 5.906 × 1.417 in), mass about 2500 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2217 work?",
        "a": "The final two digits of 2217 are bore code 17, multiplied by 5 to give 85 mm."
      },
      {
        "q": "Which fits should I use for 2217-K?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 150 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2217-K?",
        "a": "Catalogue mass is 2500 g for 2217 K; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2217",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2217-K",
      "2217 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1317-K",
    "brand": "SKF",
    "manufacturer_designation": "1317 K",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 97.5,
    "static_load_kN": 38,
    "fatigue_load_limit_kN": 1.7,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 5000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1317 carries code 17 = 85 mm (code × 5). Envelope 85×180×41 mm (3.346×7.087×1.614 in) with a 47.5 mm radial section height, C 97.5 kN, C0 38 kN and Pu 1.7 kN. The open 1317 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 7000 r/min, limiting speed 4800 r/min, catalogue mass 5000 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 1317-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "At 85 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The  suffix on 1317-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4800 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 85 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 1317-K (C 97.5 kN, C0 38 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1317-K?",
        "a": "SKF 1317 K measures 85 mm bore × 180 mm OD × 41 mm width (3.346 × 7.087 × 1.614 in), mass about 5000 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1317 work?",
        "a": "The final two digits of 1317 are bore code 17, multiplied by 5 to give 85 mm."
      },
      {
        "q": "What load can 1317-K take?",
        "a": "Catalogue values for 1317 K: dynamic C 97.5 kN, static C0 38 kN, fatigue limit Pu 1.7 kN. Use C in life calculation and C0 for static checks at 85 mm bore."
      },
      {
        "q": "What is the speed rating of 1317-K?",
        "a": "SKF lists a 7000 r/min thermal reference speed and a 4800 r/min mechanical limiting speed for 1317 K; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1317",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1317-K",
      "1317 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2317-M",
    "brand": "SKF",
    "manufacturer_designation": "2317 M",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 140,
    "static_load_kN": 51,
    "fatigue_load_limit_kN": 2.28,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 7050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2317 carries code 17 = 85 mm (code × 5). Envelope 85×180×60 mm (3.346×7.087×2.362 in) with a 47.5 mm radial section height, C 140 kN, C0 51 kN and Pu 2.28 kN. The open 2317 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution. The bore is cylindrical (straight), for a press-fit on a 85 mm shaft. Reference (thermal) speed 6700 r/min, limiting speed 4800 r/min, catalogue mass 7050 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2317-M tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The spherical outer raceway lets 2317-M tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The M suffix on 2317-M denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.",
      "Assign interference to the rotating ring: on a 85 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2317-M (C 140 kN, C0 51 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 2317-M by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2317-M?",
        "a": "SKF 2317 M measures 85 mm bore × 180 mm OD × 60 mm width (3.346 × 7.087 × 2.362 in), mass about 7050 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2317 work?",
        "a": "The final two digits of 2317 are bore code 17, multiplied by 5 to give 85 mm."
      },
      {
        "q": "What is the speed rating of 2317-M?",
        "a": "SKF lists a 6700 r/min thermal reference speed and a 4800 r/min mechanical limiting speed for 2317 M; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 2317-M tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2317-M allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2317",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2317-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×60 mm envelope with catalogue ratings within 10 %; 2317 KM is the machined brass cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2317-M",
      "2317 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2317-KM",
    "brand": "SKF",
    "manufacturer_designation": "2317 KM",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 140,
    "static_load_kN": 51,
    "fatigue_load_limit_kN": 2.28,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 7050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2317 carries code 17 = 85 mm (code × 5). Envelope 85×180×60 mm (3.346×7.087×2.362 in) with a 47.5 mm radial section height, C 140 kN, C0 51 kN and Pu 2.28 kN. The open 2317 KM carries no shields or seals and relies on application lubrication and external sealing. The KM suffix identifies the machined brass cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 6700 r/min, limiting speed 4800 r/min, catalogue mass 7050 g.",
    "applications": [
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 2317-KM by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Mount 2317-KM by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The K suffix means a 1:12 tapered bore: 2317-KM is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The KM suffix on 2317-KM denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.",
      "Fillet radii must clear the 2317-KM chamfer so the 60 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2317-KM (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2317-KM?",
        "a": "SKF 2317 KM measures 85 mm bore × 180 mm OD × 60 mm width (3.346 × 7.087 × 2.362 in), mass about 7050 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2317 work?",
        "a": "The final two digits of 2317 are bore code 17, multiplied by 5 to give 85 mm."
      },
      {
        "q": "How much misalignment can 2317-KM tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2317-KM allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2317-KM take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2317",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2317-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×60 mm envelope with catalogue ratings within 10 %; 2317 M is the machined brass cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2317-KM",
      "2317 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1218-K",
    "brand": "SKF",
    "manufacturer_designation": "1218 K",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 57.2,
    "static_load_kN": 23.6,
    "fatigue_load_limit_kN": 1.08,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 2500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1218 carries code 18 = 90 mm (code × 5). Envelope 90×160×30 mm (3.543×6.299×1.181 in) with a 35.0 mm radial section height, C 57.2 kN, C0 23.6 kN and Pu 1.08 kN. The open 1218 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 8500 r/min, limiting speed 5300 r/min, catalogue mass 2500 g.",
    "applications": [
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 90 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Mount 1218-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The K suffix means a 1:12 tapered bore: 1218-K is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The  suffix on 1218-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 1218-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 1.08 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1218-K?",
        "a": "SKF 1218 K measures 90 mm bore × 160 mm OD × 30 mm width (3.543 × 6.299 × 1.181 in), mass about 2500 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1218 work?",
        "a": "The final two digits of 1218 are bore code 18, multiplied by 5 to give 90 mm."
      },
      {
        "q": "How much misalignment can 1218-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1218-K allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 1218-K take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1218",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1218-K",
      "1218 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2218-K",
    "brand": "SKF",
    "manufacturer_designation": "2218 K",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 70.2,
    "static_load_kN": 28.5,
    "fatigue_load_limit_kN": 1.32,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 3400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2218 carries code 18 = 90 mm (code × 5). Envelope 90×160×40 mm (3.543×6.299×1.575 in) with a 35.0 mm radial section height, C 70.2 kN, C0 28.5 kN and Pu 1.32 kN. The open 2218 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 7500 r/min, limiting speed 5300 r/min, catalogue mass 3400 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2218-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The spherical outer raceway lets 2218-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The K suffix means a 1:12 tapered bore: 2218-K is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The  suffix on 2218-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 2218-K (C 70.2 kN, C0 28.5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 2218-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2218-K?",
        "a": "SKF 2218 K measures 90 mm bore × 160 mm OD × 40 mm width (3.543 × 6.299 × 1.575 in), mass about 3400 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2218 work?",
        "a": "The final two digits of 2218 are bore code 18, multiplied by 5 to give 90 mm."
      },
      {
        "q": "How heavy is 2218-K?",
        "a": "Catalogue mass is 3400 g for 2218 K; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2218-K take?",
        "a": "Catalogue values for 2218 K: dynamic C 70.2 kN, static C0 28.5 kN, fatigue limit Pu 1.32 kN. Use C in life calculation and C0 for static checks at 90 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2218",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2218-K",
      "2218 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1318-K",
    "brand": "SKF",
    "manufacturer_designation": "1318 K",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 117,
    "static_load_kN": 44,
    "fatigue_load_limit_kN": 1.93,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 5800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1318 carries code 18 = 90 mm (code × 5). Envelope 90×190×43 mm (3.543×7.48×1.693 in) with a 50.0 mm radial section height, C 117 kN, C0 44 kN and Pu 1.93 kN. The open 1318 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 6700 r/min, limiting speed 4500 r/min, catalogue mass 5800 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 1318-K (C 117 kN, C0 44 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The spherical outer raceway lets 1318-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The K suffix means a 1:12 tapered bore: 1318-K is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The  suffix on 1318-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 1318-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 1318-K chamfer so the 43 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1318-K?",
        "a": "SKF 1318 K measures 90 mm bore × 190 mm OD × 43 mm width (3.543 × 7.48 × 1.693 in), mass about 5800 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1318 work?",
        "a": "The final two digits of 1318 are bore code 18, multiplied by 5 to give 90 mm."
      },
      {
        "q": "How heavy is 1318-K?",
        "a": "Catalogue mass is 5800 g for 1318 K; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 1318-K take?",
        "a": "Catalogue values for 1318 K: dynamic C 117 kN, static C0 44 kN, fatigue limit Pu 1.93 kN. Use C in life calculation and C0 for static checks at 90 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1318",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1318-K",
      "1318 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2318-K",
    "brand": "SKF",
    "manufacturer_designation": "2318 K",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 151,
    "static_load_kN": 57,
    "fatigue_load_limit_kN": 2.5,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 8450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2318 carries code 18 = 90 mm (code × 5). Envelope 90×190×64 mm (3.543×7.48×2.52 in) with a 50.0 mm radial section height, C 151 kN, C0 57 kN and Pu 2.5 kN. The open 2318 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 6300 r/min, limiting speed 4500 r/min, catalogue mass 8450 g.",
    "applications": [
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 90 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Mount 2318-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The  suffix on 2318-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2318-K chamfer so the 64 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2318-K (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2318-K?",
        "a": "SKF 2318 K measures 90 mm bore × 190 mm OD × 64 mm width (3.543 × 7.48 × 2.52 in), mass about 8450 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2318 work?",
        "a": "The final two digits of 2318 are bore code 18, multiplied by 5 to give 90 mm."
      },
      {
        "q": "What load can 2318-K take?",
        "a": "Catalogue values for 2318 K: dynamic C 151 kN, static C0 57 kN, fatigue limit Pu 2.5 kN. Use C in life calculation and C0 for static checks at 90 mm bore."
      },
      {
        "q": "What is the speed rating of 2318-K?",
        "a": "SKF lists a 6300 r/min thermal reference speed and a 4500 r/min mechanical limiting speed for 2318 K; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2318",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2318-K",
      "2318 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1219-K",
    "brand": "SKF",
    "manufacturer_designation": "1219 K",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 63.7,
    "static_load_kN": 27,
    "fatigue_load_limit_kN": 1.2,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 3100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1219 carries code 19 = 95 mm (code × 5). Envelope 95×170×32 mm (3.74×6.693×1.26 in) with a 37.5 mm radial section height, C 63.7 kN, C0 27 kN and Pu 1.2 kN. The open 1219 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 8000 r/min, limiting speed 5000 r/min, catalogue mass 3100 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 1219-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Catalogue ratings for 1219-K (C 63.7 kN, C0 27 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "On a sleeve-mounted 1219-K, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The  suffix on 1219-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 1219-K (C 63.7 kN, C0 27 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1219-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1219-K?",
        "a": "SKF 1219 K measures 95 mm bore × 170 mm OD × 32 mm width (3.74 × 6.693 × 1.26 in), mass about 3100 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1219 work?",
        "a": "The final two digits of 1219 are bore code 19, multiplied by 5 to give 95 mm."
      },
      {
        "q": "What is the speed rating of 1219-K?",
        "a": "SKF lists a 8000 r/min thermal reference speed and a 5000 r/min mechanical limiting speed for 1219 K; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1219-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1219-K allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1219",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1219-K",
      "1219 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2219-K",
    "brand": "SKF",
    "manufacturer_designation": "2219 K",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 83.2,
    "static_load_kN": 34.5,
    "fatigue_load_limit_kN": 1.53,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 4100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2219 carries code 19 = 95 mm (code × 5). Envelope 95×170×43 mm (3.74×6.693×1.693 in) with a 37.5 mm radial section height, C 83.2 kN, C0 34.5 kN and Pu 1.53 kN. The open 2219 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 7000 r/min, limiting speed 5000 r/min, catalogue mass 4100 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 95 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Fillet radii must clear the 2219-K chamfer so the 43 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The K suffix means a 1:12 tapered bore: 2219-K is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The  suffix on 2219-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 2219-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 1.53 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2219-K?",
        "a": "SKF 2219 K measures 95 mm bore × 170 mm OD × 43 mm width (3.74 × 6.693 × 1.693 in), mass about 4100 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2219 work?",
        "a": "The final two digits of 2219 are bore code 19, multiplied by 5 to give 95 mm."
      },
      {
        "q": "How much misalignment can 2219-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2219-K allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2219-K take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2219",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2219-K",
      "2219 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1319-K",
    "brand": "SKF",
    "manufacturer_designation": "1319 K",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 133,
    "static_load_kN": 51,
    "fatigue_load_limit_kN": 2.16,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 6700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1319 carries code 19 = 95 mm (code × 5). Envelope 95×200×45 mm (3.74×7.874×1.772 in) with a 52.5 mm radial section height, C 133 kN, C0 51 kN and Pu 2.16 kN. The open 1319 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 6300 r/min, limiting speed 4300 r/min, catalogue mass 6700 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 95 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the 1319-K chamfer so the 45 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "On a sleeve-mounted 1319-K, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The  suffix on 1319-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 1319-K chamfer so the 45 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1319-K (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1319-K?",
        "a": "SKF 1319 K measures 95 mm bore × 200 mm OD × 45 mm width (3.74 × 7.874 × 1.772 in), mass about 6700 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1319 work?",
        "a": "The final two digits of 1319 are bore code 19, multiplied by 5 to give 95 mm."
      },
      {
        "q": "Which fits should I use for 1319-K?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 200 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 1319-K?",
        "a": "Catalogue mass is 6700 g for 1319 K; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1319",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1319-K",
      "1319 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2319-M",
    "brand": "SKF",
    "manufacturer_designation": "2319 M",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 165,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 2.75,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 9800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2319 carries code 19 = 95 mm (code × 5). Envelope 95×200×67 mm (3.74×7.874×2.638 in) with a 52.5 mm radial section height, C 165 kN, C0 64 kN and Pu 2.75 kN. The open 2319 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution. The bore is cylindrical (straight), for a press-fit on a 95 mm shaft. Reference (thermal) speed 6000 r/min, limiting speed 4500 r/min, catalogue mass 9800 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2319-M (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The fatigue load limit is 2.75 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The M suffix on 2319-M denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.",
      "Mount 2319-M by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 2.75 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 95 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2319-M?",
        "a": "SKF 2319 M measures 95 mm bore × 200 mm OD × 67 mm width (3.74 × 7.874 × 2.638 in), mass about 9800 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2319 work?",
        "a": "The final two digits of 2319 are bore code 19, multiplied by 5 to give 95 mm."
      },
      {
        "q": "Can 2319-M take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 2319-M?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 200 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2319",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2319-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×67 mm envelope with catalogue ratings within 10 %; 2319 KM is the machined brass cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2319-M",
      "2319 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2319-KM",
    "brand": "SKF",
    "manufacturer_designation": "2319 KM",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 165,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 2.75,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 9800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2319 carries code 19 = 95 mm (code × 5). Envelope 95×200×67 mm (3.74×7.874×2.638 in) with a 52.5 mm radial section height, C 165 kN, C0 64 kN and Pu 2.75 kN. The open 2319 KM carries no shields or seals and relies on application lubrication and external sealing. The KM suffix identifies the machined brass cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 6000 r/min, limiting speed 4500 r/min, catalogue mass 9800 g.",
    "applications": [
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 95 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Assign interference to the rotating ring: on a 95 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The KM suffix on 2319-KM denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.",
      "Assign interference to the rotating ring: on a 95 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 2319-KM (C 165 kN, C0 64 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2319-KM?",
        "a": "SKF 2319 KM measures 95 mm bore × 200 mm OD × 67 mm width (3.74 × 7.874 × 2.638 in), mass about 9800 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2319 work?",
        "a": "The final two digits of 2319 are bore code 19, multiplied by 5 to give 95 mm."
      },
      {
        "q": "What load can 2319-KM take?",
        "a": "Catalogue values for 2319 KM: dynamic C 165 kN, static C0 64 kN, fatigue limit Pu 2.75 kN. Use C in life calculation and C0 for static checks at 95 mm bore."
      },
      {
        "q": "What is the speed rating of 2319-KM?",
        "a": "SKF lists a 6000 r/min thermal reference speed and a 4500 r/min mechanical limiting speed for 2319 KM; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2319",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2319-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×67 mm envelope with catalogue ratings within 10 %; 2319 M is the machined brass cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2319-KM",
      "2319 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1220-K",
    "brand": "SKF",
    "manufacturer_designation": "1220 K",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 68.9,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 1.29,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 3700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1220 carries code 20 = 100 mm (code × 5). Envelope 100×180×34 mm (3.937×7.087×1.339 in) with a 40.0 mm radial section height, C 68.9 kN, C0 30 kN and Pu 1.29 kN. The open 1220 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 7500 r/min, limiting speed 4800 r/min, catalogue mass 3700 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 1220-K (C 68.9 kN, C0 30 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Catalogue ratings for 1220-K (C 68.9 kN, C0 30 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "On a sleeve-mounted 1220-K, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The  suffix on 1220-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4800 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 1220-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 1220-K chamfer so the 34 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1220-K?",
        "a": "SKF 1220 K measures 100 mm bore × 180 mm OD × 34 mm width (3.937 × 7.087 × 1.339 in), mass about 3700 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1220 work?",
        "a": "The final two digits of 1220 are bore code 20, multiplied by 5 to give 100 mm."
      },
      {
        "q": "What is the speed rating of 1220-K?",
        "a": "SKF lists a 7500 r/min thermal reference speed and a 4800 r/min mechanical limiting speed for 1220 K; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1220-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1220-K allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1220",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1220-K",
      "1220 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2220-K",
    "brand": "SKF",
    "manufacturer_designation": "2220 K",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 97.5,
    "static_load_kN": 40.5,
    "fatigue_load_limit_kN": 1.76,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 5000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2220 carries code 20 = 100 mm (code × 5). Envelope 100×180×46 mm (3.937×7.087×1.811 in) with a 40.0 mm radial section height, C 97.5 kN, C0 40.5 kN and Pu 1.76 kN. The open 2220 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 6700 r/min, limiting speed 4800 r/min, catalogue mass 5000 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 100 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the 2220-K chamfer so the 46 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "On a sleeve-mounted 2220-K, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The  suffix on 2220-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4800 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 2220-K chamfer so the 46 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2220-K (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2220-K?",
        "a": "SKF 2220 K measures 100 mm bore × 180 mm OD × 46 mm width (3.937 × 7.087 × 1.811 in), mass about 5000 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2220 work?",
        "a": "The final two digits of 2220 are bore code 20, multiplied by 5 to give 100 mm."
      },
      {
        "q": "Which fits should I use for 2220-K?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 180 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 2220-K?",
        "a": "Catalogue mass is 5000 g for 2220 K; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2220",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2220-K",
      "2220 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1320-K",
    "brand": "SKF",
    "manufacturer_designation": "1320 K",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 143,
    "static_load_kN": 57,
    "fatigue_load_limit_kN": 2.36,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 8300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1320 carries code 20 = 100 mm (code × 5). Envelope 100×215×47 mm (3.937×8.465×1.85 in) with a 57.5 mm radial section height, C 143 kN, C0 57 kN and Pu 2.36 kN. The open 1320 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 6000 r/min, limiting speed 4000 r/min, catalogue mass 8300 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 100 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Fillet radii must clear the 1320-K chamfer so the 47 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The  suffix on 1320-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 1320-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 2.36 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1320-K?",
        "a": "SKF 1320 K measures 100 mm bore × 215 mm OD × 47 mm width (3.937 × 8.465 × 1.85 in), mass about 8300 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1320 work?",
        "a": "The final two digits of 1320 are bore code 20, multiplied by 5 to give 100 mm."
      },
      {
        "q": "What load can 1320-K take?",
        "a": "Catalogue values for 1320 K: dynamic C 143 kN, static C0 57 kN, fatigue limit Pu 2.36 kN. Use C in life calculation and C0 for static checks at 100 mm bore."
      },
      {
        "q": "What is the speed rating of 1320-K?",
        "a": "SKF lists a 6000 r/min thermal reference speed and a 4000 r/min mechanical limiting speed for 1320 K; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1320",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1320-K",
      "1320 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2320-K",
    "brand": "SKF",
    "manufacturer_designation": "2320 K",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 190,
    "static_load_kN": 80,
    "fatigue_load_limit_kN": 3.25,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2320 carries code 20 = 100 mm (code × 5). Envelope 100×215×73 mm (3.937×8.465×2.874 in) with a 57.5 mm radial section height, C 190 kN, C0 80 kN and Pu 3.25 kN. The open 2320 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 5600 r/min, limiting speed 4000 r/min, catalogue mass 12500 g.",
    "applications": [
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts",
      "agricultural gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 2320-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Catalogue ratings for 2320-K (C 190 kN, C0 80 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The K suffix means a 1:12 tapered bore: 2320-K is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The  suffix on 2320-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 2320-K (C 190 kN, C0 80 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 2320-K by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2320-K?",
        "a": "SKF 2320 K measures 100 mm bore × 215 mm OD × 73 mm width (3.937 × 8.465 × 2.874 in), mass about 12500 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2320 work?",
        "a": "The final two digits of 2320 are bore code 20, multiplied by 5 to give 100 mm."
      },
      {
        "q": "How heavy is 2320-K?",
        "a": "Catalogue mass is 12500 g for 2320 K; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 2320-K take?",
        "a": "Catalogue values for 2320 K: dynamic C 190 kN, static C0 80 kN, fatigue limit Pu 3.25 kN. Use C in life calculation and C0 for static checks at 100 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2320",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2320-K",
      "2320 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1222-K",
    "brand": "SKF",
    "manufacturer_designation": "1222 K",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 88.4,
    "static_load_kN": 39,
    "fatigue_load_limit_kN": 1.6,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 5150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1222 carries code 22 = 110 mm (code × 5). Envelope 110×200×38 mm (4.331×7.874×1.496 in) with a 45.0 mm radial section height, C 88.4 kN, C0 39 kN and Pu 1.6 kN. The open 1222 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 6700 r/min, limiting speed 4300 r/min, catalogue mass 5150 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1222-K (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The fatigue load limit is 1.6 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "On a sleeve-mounted 1222-K, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The  suffix on 1222-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 1.6 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 110 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1222-K?",
        "a": "SKF 1222 K measures 110 mm bore × 200 mm OD × 38 mm width (4.331 × 7.874 × 1.496 in), mass about 5150 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1222 work?",
        "a": "The final two digits of 1222 are bore code 22, multiplied by 5 to give 110 mm."
      },
      {
        "q": "What is the speed rating of 1222-K?",
        "a": "SKF lists a 6700 r/min thermal reference speed and a 4300 r/min mechanical limiting speed for 1222 K; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1222-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1222-K allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1222",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1222-K",
      "1222 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "2222-K",
    "brand": "SKF",
    "manufacturer_designation": "2222 K",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 124,
    "static_load_kN": 52,
    "fatigue_load_limit_kN": 2.12,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 7100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2222 carries code 22 = 110 mm (code × 5). Envelope 110×200×53 mm (4.331×7.874×2.087 in) with a 45.0 mm radial section height, C 124 kN, C0 52 kN and Pu 2.12 kN. The open 2222 K carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 6000 r/min, limiting speed 4300 r/min, catalogue mass 7100 g.",
    "applications": [
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "false brinelling from vibration while the shaft stands idle",
      "fretting corrosion on a creeping shaft or housing seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the 2222-K chamfer so the 53 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring: on a 110 mm rotating shaft use a m6 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The K suffix means a 1:12 tapered bore: 2222-K is not a drop-in for the straight-bore version — it needs a tapered shaft or an H-series adapter sleeve.",
      "The  suffix on 2222-K denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 110 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 2222-K tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 2222-K?",
        "a": "SKF 2222 K measures 110 mm bore × 200 mm OD × 53 mm width (4.331 × 7.874 × 2.087 in), mass about 7100 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 2222 work?",
        "a": "The final two digits of 2222 are bore code 22, multiplied by 5 to give 110 mm."
      },
      {
        "q": "How much misalignment can 2222-K tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2222-K allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 2222-K take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "2222",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "2222-K",
      "2222 K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1322-M",
    "brand": "SKF",
    "manufacturer_designation": "1322 M",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 163,
    "static_load_kN": 72,
    "fatigue_load_limit_kN": 2.75,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1322 carries code 22 = 110 mm (code × 5). Envelope 110×240×50 mm (4.331×9.449×1.969 in) with a 65.0 mm radial section height, C 163 kN, C0 72 kN and Pu 2.75 kN. The open 1322 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution. The bore is cylindrical (straight), for a press-fit on a 110 mm shaft. Reference (thermal) speed 5300 r/min, limiting speed 3600 r/min, catalogue mass 12000 g.",
    "applications": [
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment",
      "material-handling equipment"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 110 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Fillet radii must clear the 1322-M chamfer so the 50 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The M suffix on 1322-M denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.",
      "Catalogue ratings for 1322-M (C 163 kN, C0 72 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1322-M by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 2.75 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1322-M?",
        "a": "SKF 1322 M measures 110 mm bore × 240 mm OD × 50 mm width (4.331 × 9.449 × 1.969 in), mass about 12000 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1322 work?",
        "a": "The final two digits of 1322 are bore code 22, multiplied by 5 to give 110 mm."
      },
      {
        "q": "What load can 1322-M take?",
        "a": "Catalogue values for 1322 M: dynamic C 163 kN, static C0 72 kN, fatigue limit Pu 2.75 kN. Use C in life calculation and C0 for static checks at 110 mm bore."
      },
      {
        "q": "What is the speed rating of 1322-M?",
        "a": "SKF lists a 5300 r/min thermal reference speed and a 3600 r/min mechanical limiting speed for 1322 M; real limits also depend on lubrication and fits."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1322",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1322-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 1322 KM is the machined brass cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1322-M",
      "1322 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1322-KM",
    "brand": "SKF",
    "manufacturer_designation": "1322 KM",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 163,
    "static_load_kN": 72,
    "fatigue_load_limit_kN": 2.75,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 1322 carries code 22 = 110 mm (code × 5). Envelope 110×240×50 mm (4.331×9.449×1.969 in) with a 65.0 mm radial section height, C 163 kN, C0 72 kN and Pu 2.75 kN. The open 1322 KM carries no shields or seals and relies on application lubrication and external sealing. The KM suffix identifies the machined brass cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 5300 r/min, limiting speed 3600 r/min, catalogue mass 12000 g.",
    "applications": [
      "conveyor drum and pulley shafts",
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 1322-KM (C 163 kN, C0 72 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The fatigue load limit is 2.75 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The KM suffix on 1322-KM denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1322-KM (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 110 mm rotating shaft use a m6 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1322-KM?",
        "a": "SKF 1322 KM measures 110 mm bore × 240 mm OD × 50 mm width (4.331 × 9.449 × 1.969 in), mass about 12000 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1322 work?",
        "a": "The final two digits of 1322 are bore code 22, multiplied by 5 to give 110 mm."
      },
      {
        "q": "Can 1322-KM take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 1322-KM?",
        "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 240 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1322",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1322-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 1322 M is the machined brass cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1322-KM",
      "1322 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1224-M",
    "brand": "SKF",
    "manufacturer_designation": "1224 M",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 119,
    "static_load_kN": 53,
    "fatigue_load_limit_kN": 2.12,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 6750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1224 carries code 24 = 120 mm (code × 5). Envelope 120×215×42 mm (4.724×8.465×1.654 in) with a 47.5 mm radial section height, C 119 kN, C0 53 kN and Pu 2.12 kN. The open 1224 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution. The bore is cylindrical (straight), for a press-fit on a 120 mm shaft. Reference (thermal) speed 6300 r/min, limiting speed 4000 r/min, catalogue mass 6750 g.",
    "applications": [
      "crusher feeders",
      "large industrial gearboxes",
      "material-handling winches",
      "large conveyor drives"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 2.12 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1224-M (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The M suffix on 1224-M denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.",
      "Fillet radii must clear the 1224-M chamfer so the 42 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1224-M (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 120 mm rotating shaft use a m6 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1224-M?",
        "a": "SKF 1224 M measures 120 mm bore × 215 mm OD × 42 mm width (4.724 × 8.465 × 1.654 in), mass about 6750 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1224 work?",
        "a": "The final two digits of 1224 are bore code 24, multiplied by 5 to give 120 mm."
      },
      {
        "q": "What is the speed rating of 1224-M?",
        "a": "SKF lists a 6300 r/min thermal reference speed and a 4000 r/min mechanical limiting speed for 1224 M; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 1224-M tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 1224-M allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1224-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×215×42 mm envelope with catalogue ratings within 10 %; 1224 KM is the machined brass cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1224-M",
      "1224 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1224-KM",
    "brand": "SKF",
    "manufacturer_designation": "1224 KM",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 119,
    "static_load_kN": 53,
    "fatigue_load_limit_kN": 2.12,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 6750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1224 carries code 24 = 120 mm (code × 5). Envelope 120×215×42 mm (4.724×8.465×1.654 in) with a 47.5 mm radial section height, C 119 kN, C0 53 kN and Pu 2.12 kN. The open 1224 KM carries no shields or seals and relies on application lubrication and external sealing. The KM suffix identifies the machined brass cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 6300 r/min, limiting speed 4000 r/min, catalogue mass 6750 g.",
    "applications": [
      "mill and kiln auxiliary drives",
      "paper-machine rolls",
      "marine deck machinery",
      "crusher feeders"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 120 mm rotating shaft use a m6 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "At 120 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "On a sleeve-mounted 1224-KM, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The KM suffix on 1224-KM denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.",
      "At 120 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 1224-KM tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1224-KM?",
        "a": "SKF 1224 KM measures 120 mm bore × 215 mm OD × 42 mm width (4.724 × 8.465 × 1.654 in), mass about 6750 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1224 work?",
        "a": "The final two digits of 1224 are bore code 24, multiplied by 5 to give 120 mm."
      },
      {
        "q": "Which fits should I use for 1224-KM?",
        "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 215 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 1224-KM?",
        "a": "Catalogue mass is 6750 g for 1224 KM; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1224-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×215×42 mm envelope with catalogue ratings within 10 %; 1224 M is the machined brass cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1224-KM",
      "1224 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1226-M",
    "brand": "SKF",
    "manufacturer_designation": "1226 M",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 127,
    "static_load_kN": 58.5,
    "fatigue_load_limit_kN": 2.24,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 8300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1226 carries code 26 = 130 mm (code × 5). Envelope 130×230×46 mm (5.118×9.055×1.811 in) with a 50.0 mm radial section height, C 127 kN, C0 58.5 kN and Pu 2.24 kN. The open 1226 M carries no shields or seals and relies on application lubrication and external sealing. The M suffix identifies the machined brass cage execution. The bore is cylindrical (straight), for a press-fit on a 130 mm shaft. Reference (thermal) speed 5600 r/min, limiting speed 3600 r/min, catalogue mass 8300 g.",
    "applications": [
      "paper-machine rolls",
      "marine deck machinery",
      "crusher feeders",
      "large industrial gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 1226-M tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The spherical outer raceway lets 1226-M tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The M suffix on 1226-M denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.",
      "Assign interference to the rotating ring: on a 130 mm rotating shaft use a m6 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 1226-M (C 127 kN, C0 58.5 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 1226-M by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1226-M?",
        "a": "SKF 1226 M measures 130 mm bore × 230 mm OD × 46 mm width (5.118 × 9.055 × 1.811 in), mass about 8300 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1226 work?",
        "a": "The final two digits of 1226 are bore code 26, multiplied by 5 to give 130 mm."
      },
      {
        "q": "How heavy is 1226-M?",
        "a": "Catalogue mass is 8300 g for 1226 M; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 1226-M take?",
        "a": "Catalogue values for 1226 M: dynamic C 127 kN, static C0 58.5 kN, fatigue limit Pu 2.24 kN. Use C in life calculation and C0 for static checks at 130 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1226-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×230×46 mm envelope with catalogue ratings within 10 %; 1226 KM is the machined brass cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1226-M",
      "1226 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1226-KM",
    "brand": "SKF",
    "manufacturer_designation": "1226 KM",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 127,
    "static_load_kN": 58.5,
    "fatigue_load_limit_kN": 2.24,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 8300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1226 carries code 26 = 130 mm (code × 5). Envelope 130×230×46 mm (5.118×9.055×1.811 in) with a 50.0 mm radial section height, C 127 kN, C0 58.5 kN and Pu 2.24 kN. The open 1226 KM carries no shields or seals and relies on application lubrication and external sealing. The KM suffix identifies the machined brass cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Reference (thermal) speed 5600 r/min, limiting speed 3600 r/min, catalogue mass 8300 g.",
    "applications": [
      "large conveyor drives",
      "heavy fan and blower shafts",
      "mill and kiln auxiliary drives",
      "paper-machine rolls"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 1226-KM by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Mount 1226-KM by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "On a sleeve-mounted 1226-KM, lock the sleeve against the shaft shoulder; a loose sleeve creeps and frets both the shaft and the bore.",
      "The KM suffix on 1226-KM denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.",
      "Fillet radii must clear the 1226-KM chamfer so the 46 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 1226-KM (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 1226-KM?",
        "a": "SKF 1226 KM measures 130 mm bore × 230 mm OD × 46 mm width (5.118 × 9.055 × 1.811 in), mass about 8300 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 1226 work?",
        "a": "The final two digits of 1226 are bore code 26, multiplied by 5 to give 130 mm."
      },
      {
        "q": "Which fits should I use for 1226-KM?",
        "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 230 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 1226-KM?",
        "a": "Catalogue mass is 8300 g for 1226 KM; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1226-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×230×46 mm envelope with catalogue ratings within 10 %; 1226 M is the machined brass cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "1226-KM",
      "1226 KM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "13030",
    "brand": "SKF",
    "manufacturer_designation": "13030",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 57.2,
    "static_load_kN": 23.6,
    "fatigue_load_limit_kN": 0.88,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 7500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 13030 carries code 30 = 150 mm (code × 5). Envelope 150×225×56 mm (5.906×8.858×2.205 in) with a 37.5 mm radial section height, C 57.2 kN, C0 23.6 kN and Pu 0.88 kN. The open 13030 carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 150 mm shaft. Reference (thermal) speed 5600 r/min, limiting speed 3400 r/min, catalogue mass 7500 g.",
    "applications": [
      "crusher feeders",
      "large industrial gearboxes",
      "material-handling winches",
      "large conveyor drives"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 13030 (C 57.2 kN, C0 23.6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 13030 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The  suffix on 13030 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 3400 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 13030 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.88 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 150 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 13030?",
        "a": "SKF 13030 measures 150 mm bore × 225 mm OD × 56 mm width (5.906 × 8.858 × 2.205 in), mass about 7500 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 13030 work?",
        "a": "The final two digits of 13030 are bore code 30, multiplied by 5 to give 150 mm."
      },
      {
        "q": "How heavy is 13030?",
        "a": "Catalogue mass is 7500 g for 13030; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can 13030 take?",
        "a": "Catalogue values for 13030: dynamic C 57.2 kN, static C0 23.6 kN, fatigue limit Pu 0.88 kN. Use C in life calculation and C0 for static checks at 150 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "13030",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "13030",
      "13030"
    ],
    "locale_variants": {}
  },
  {
    "sku": "13036",
    "brand": "SKF",
    "manufacturer_designation": "13036",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 95.6,
    "static_load_kN": 40,
    "fatigue_load_limit_kN": 1.34,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 16000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 13036 carries code 36 = 180 mm (code × 5). Envelope 180×280×74 mm (7.087×11.024×2.913 in) with a 50.0 mm radial section height, C 95.6 kN, C0 40 kN and Pu 1.34 kN. The open 13036 carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 180 mm shaft. Reference (thermal) speed 4500 r/min, limiting speed 2800 r/min, catalogue mass 16000 g.",
    "applications": [
      "paper-machine rolls",
      "marine deck machinery",
      "crusher feeders",
      "large industrial gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 13036 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The spherical outer raceway lets 13036 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The  suffix on 13036 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 2800 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 180 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets 13036 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 13036 chamfer so the 74 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 13036?",
        "a": "SKF 13036 measures 180 mm bore × 280 mm OD × 74 mm width (7.087 × 11.024 × 2.913 in), mass about 16000 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 13036 work?",
        "a": "The final two digits of 13036 are bore code 36, multiplied by 5 to give 180 mm."
      },
      {
        "q": "What is the speed rating of 13036?",
        "a": "SKF lists a 4500 r/min thermal reference speed and a 2800 r/min mechanical limiting speed for 13036; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 13036 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 13036 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "13036",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "13036",
      "13036"
    ],
    "locale_variants": {}
  },
  {
    "sku": "13940",
    "brand": "SKF",
    "manufacturer_designation": "13940",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 60.5,
    "static_load_kN": 29,
    "fatigue_load_limit_kN": 0.97,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 13940 carries code 40 = 200 mm (code × 5). Envelope 200×280×60 mm (7.874×11.024×2.362 in) with a 40.0 mm radial section height, C 60.5 kN, C0 29 kN and Pu 0.97 kN. The open 13940 carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 200 mm shaft. Reference (thermal) speed 4300 r/min, limiting speed 2600 r/min, catalogue mass 10500 g.",
    "applications": [
      "crusher feeders",
      "large industrial gearboxes",
      "material-handling winches",
      "large conveyor drives"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 13940 (C 60.5 kN, C0 29 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 13940 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The  suffix on 13940 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 2600 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 13940 chamfer so the 60 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 13940 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 200 mm rotating shaft use a m6 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 13940?",
        "a": "SKF 13940 measures 200 mm bore × 280 mm OD × 60 mm width (7.874 × 11.024 × 2.362 in), mass about 10500 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 13940 work?",
        "a": "The final two digits of 13940 are bore code 40, multiplied by 5 to give 200 mm."
      },
      {
        "q": "What is the speed rating of 13940?",
        "a": "SKF lists a 4300 r/min thermal reference speed and a 2600 r/min mechanical limiting speed for 13940; real limits also depend on lubrication and fits."
      },
      {
        "q": "How much misalignment can 13940 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 13940 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "13940",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "13940",
      "13940"
    ],
    "locale_variants": {}
  },
  {
    "sku": "13944",
    "brand": "SKF",
    "manufacturer_designation": "13944",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 60.5,
    "static_load_kN": 30.5,
    "fatigue_load_limit_kN": 0.97,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 13944 carries code 44 = 220 mm (code × 5). Envelope 220×300×60 mm (8.661×11.811×2.362 in) with a 40.0 mm radial section height, C 60.5 kN, C0 30.5 kN and Pu 0.97 kN. The open 13944 carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 220 mm shaft. Reference (thermal) speed 3800 r/min, limiting speed 2400 r/min, catalogue mass 11000 g.",
    "applications": [
      "heavy fan and blower shafts",
      "mill and kiln auxiliary drives",
      "paper-machine rolls",
      "marine deck machinery"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 13944 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The fatigue load limit is 0.97 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The  suffix on 13944 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 2400 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 13944 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.97 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 220 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 13944?",
        "a": "SKF 13944 measures 220 mm bore × 300 mm OD × 60 mm width (8.661 × 11.811 × 2.362 in), mass about 11000 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 13944 work?",
        "a": "The final two digits of 13944 are bore code 44, multiplied by 5 to give 220 mm."
      },
      {
        "q": "Can 13944 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 13944?",
        "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 300 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "13944",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "13944",
      "13944"
    ],
    "locale_variants": {}
  },
  {
    "sku": "13948",
    "brand": "SKF",
    "manufacturer_designation": "13948",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 60.5,
    "static_load_kN": 32,
    "fatigue_load_limit_kN": 0.98,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 11500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 13xx series is the medium/normal-section self-aligning ball bearing (ISO dimension series 03). the last two digits encode the bore: 13948 carries code 48 = 240 mm (code × 5). Envelope 240×320×60 mm (9.449×12.598×2.362 in) with a 40.0 mm radial section height, C 60.5 kN, C0 32 kN and Pu 0.98 kN. The open 13948 carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 240 mm shaft. Reference (thermal) speed 3800 r/min, limiting speed 2200 r/min, catalogue mass 11500 g.",
    "applications": [
      "crusher feeders",
      "large industrial gearboxes",
      "material-handling winches",
      "large conveyor drives"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for 13948 (C 60.5 kN, C0 32 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 13948 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The  suffix on 13948 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 2200 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 13948 chamfer so the 60 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 13948 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Assign interference to the rotating ring: on a 240 mm rotating shaft use a m6 seat with an H7 housing; reverse the logic if the outer ring rotates."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 13948?",
        "a": "SKF 13948 measures 240 mm bore × 320 mm OD × 60 mm width (9.449 × 12.598 × 2.362 in), mass about 11500 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 13948 work?",
        "a": "The final two digits of 13948 are bore code 48, multiplied by 5 to give 240 mm."
      },
      {
        "q": "Can 13948 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for 13948?",
        "a": "With a rotating inner ring use roughly m6 on the shaft and H7 in the 320 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "13948",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "13948",
      "13948"
    ],
    "locale_variants": {}
  },
  {
    "sku": "E-2RS1KTN9-H",
    "brand": "SKF",
    "manufacturer_designation": "E-2RS1KTN9 H",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 52,
    "D_mm": 18,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "weight_g": 2205000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The Exx series is a self-aligning ball bearing family. the final digit of E is the bore in millimetres: E-2RS1KTN9 H fits a 52 mm shaft (direct miniature spelling). Envelope 52×18×31 mm (2.047×0.709×1.22 in) with a -17.0 mm radial section height, C undefined kN, C0 undefined kN and Pu undefined kN. SKF spells the sealed execution E-2RS1KTN9 H (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore, here supplied with the 305 E adapter sleeve for mounting on a cylindrical 52 mm shaft. Limiting speed undefined r/min, catalogue mass 2205000 g.",
    "applications": [
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery",
      "pump shafts with mild misalignment"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "raceway smearing under marginal lubrication at start-up",
      "electrical pitting in VFD-driven motors without shaft grounding"
    ],
    "pitfalls": [
      "Catalogue ratings for E-2RS1KTN9-H (C undefined kN, C0 undefined kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The spherical outer raceway lets E-2RS1KTN9-H tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The 2RS1 contact seals on E-2RS1KTN9-H add drag and cap speed at undefined r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The  suffix on E-2RS1KTN9-H denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the undefined r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount E-2RS1KTN9-H by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of E-2RS1KTN9-H?",
        "a": "SKF E-2RS1KTN9 H measures 52 mm bore × 18 mm OD × 31 mm width (2.047 × 0.709 × 1.22 in), mass about 2205000 g. It has two contact rubber seals (2RS1) and a lifetime grease fill."
      },
      {
        "q": "How do I read the E designation?",
        "a": "Miniature self-aligning bearings print the bore as the final digit, so E is a 52 mm bearing; the leading digits give the section family."
      },
      {
        "q": "Can E-2RS1KTN9-H take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      },
      {
        "q": "Which fits should I use for E-2RS1KTN9-H?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 18 mm housing; reverse the interference if the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "E",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "E-2RS1KTN9-H",
      "E-2RS1KTN9 H"
    ],
    "locale_variants": {}
  },
  {
    "sku": "EKTN9-H",
    "brand": "SKF",
    "manufacturer_designation": "EKTN9 H",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 52,
    "D_mm": 18,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "weight_g": 2205000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The EKxx series is a self-aligning ball bearing family. the last two digits encode the bore: EKTN9 carries code NaN = 52 mm (code × 5). Envelope 52×18×32 mm (2.047×0.709×1.26 in) with a -17.0 mm radial section height, C undefined kN, C0 undefined kN and Pu undefined kN. The open EKTN9 H carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore, here supplied with the 305 adapter sleeve for mounting on a cylindrical 52 mm shaft. Limiting speed undefined r/min, catalogue mass 2205000 g.",
    "applications": [
      "pump shafts with mild misalignment",
      "material-handling equipment",
      "industrial electric motors",
      "conveyor drum and pulley shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 52 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Assign interference to the rotating ring: on a 52 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "The K suffix means a 1:12 tapered bore: EKTN9-H is not a drop-in for the straight-bore version — it needs a tapered shaft or an 305 adapter sleeve.",
      "The  suffix on EKTN9-H denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the undefined r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 52 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets EKTN9-H tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of EKTN9-H?",
        "a": "SKF EKTN9 H measures 52 mm bore × 18 mm OD × 32 mm width (2.047 × 0.709 × 1.26 in), mass about 2205000 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in EKTN9 work?",
        "a": "The final two digits of EKTN9 are bore code NaN, multiplied by 5 to give 52 mm."
      },
      {
        "q": "How much misalignment can EKTN9-H tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like EKTN9-H allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can EKTN9-H take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "EKTN9",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "EKTN9-H",
      "EKTN9 H"
    ],
    "locale_variants": {}
  },
  {
    "sku": "K-H",
    "brand": "SKF",
    "manufacturer_designation": "K H",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 72,
    "D_mm": 27,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "weight_g": 2306000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The Kxx series is a self-aligning ball bearing family. the final digit of K is the bore in millimetres: K H fits a 72 mm shaft (direct miniature spelling). Envelope 72×27×41 mm (2.835×1.063×1.614 in) with a -22.5 mm radial section height, C undefined kN, C0 undefined kN and Pu undefined kN. The open K H carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore, here supplied with the 2306 adapter sleeve for mounting on a cylindrical 72 mm shaft. Limiting speed undefined r/min, catalogue mass 2306000 g.",
    "applications": [
      "agricultural gearboxes",
      "textile machinery drives",
      "industrial fans and blowers",
      "woodworking machinery"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 72 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "At 72 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.",
      "The  suffix on K-H denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the undefined r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "At 72 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "The spherical outer raceway lets K-H tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of K-H?",
        "a": "SKF K H measures 72 mm bore × 27 mm OD × 41 mm width (2.835 × 1.063 × 1.614 in), mass about 2306000 g. It is open, with no shields or seals."
      },
      {
        "q": "How do I read the K designation?",
        "a": "Miniature self-aligning bearings print the bore as the final digit, so K is a 72 mm bearing; the leading digits give the section family."
      },
      {
        "q": "What load can K-H take?",
        "a": "Catalogue values for K H: dynamic C undefined kN, static C0 undefined kN, fatigue limit Pu undefined kN. Use C in life calculation and C0 for static checks at 72 mm bore."
      },
      {
        "q": "What is the speed rating of K-H?",
        "a": "SKF publishes only the undefined r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "K-H",
      "K H"
    ],
    "locale_variants": {}
  },
  {
    "sku": "KM-H",
    "brand": "SKF",
    "manufacturer_designation": "KM H",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 240,
    "D_mm": 50,
    "B_mm": 154,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "weight_g": 1322000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The KMxx series is a self-aligning ball bearing family. the final digit of KM is the bore in millimetres: KM H fits a 240 mm shaft (direct miniature spelling). Envelope 240×50×154 mm (9.449×1.969×6.063 in) with a -95.0 mm radial section height, C undefined kN, C0 undefined kN and Pu undefined kN. The open KM H carries no shields or seals and relies on application lubrication and external sealing. The  suffix identifies the machined brass cage execution. The K suffix marks a 1:12 tapered bore, here supplied with the 322 adapter sleeve for mounting on a cylindrical 240 mm shaft. Limiting speed undefined r/min, catalogue mass 1322000 g.",
    "applications": [
      "paper-machine rolls",
      "marine deck machinery",
      "crusher feeders",
      "large industrial gearboxes"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder",
      "incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets KM-H tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The spherical outer raceway lets KM-H tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The K suffix means a 1:12 tapered bore: KM-H is not a drop-in for the straight-bore version — it needs a tapered shaft or an 322 adapter sleeve.",
      "The  suffix on KM-H denotes a machined brass cage: the choice for high speeds, marginal lubrication and shock/vibration duty, and temperature-tolerant where polymer cages are not.",
      "Catalogue ratings for KM-H (C undefined kN, C0 undefined kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount KM-H by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of KM-H?",
        "a": "SKF KM H measures 240 mm bore × 50 mm OD × 154 mm width (9.449 × 1.969 × 6.063 in), mass about 1322000 g. It is open, with no shields or seals."
      },
      {
        "q": "How do I read the KM designation?",
        "a": "Miniature self-aligning bearings print the bore as the final digit, so KM is a 240 mm bearing; the leading digits give the section family."
      },
      {
        "q": "How heavy is KM-H?",
        "a": "Catalogue mass is 1322000 g for KM H; seal and cage executions of the same envelope differ by a few grams."
      },
      {
        "q": "What load can KM-H take?",
        "a": "Catalogue values for KM H: dynamic C undefined kN, static C0 undefined kN, fatigue limit Pu undefined kN. Use C in life calculation and C0 for static checks at 240 mm bore."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "KM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "KM-H",
      "KM H"
    ],
    "locale_variants": {}
  },
  {
    "sku": "11204-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "11204 ETN9",
    "series": "11200-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 12.7,
    "static_load_kN": 3.4,
    "fatigue_load_limit_kN": 0.18,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 112xx series is SKF's extended-inner-ring self-aligning ball bearing: the inner ring is wider than the outer, giving a longer shaft seat for locating-bearing duty. the last two digits encode the bore: 11204 carries code 04 = 20 mm (code × 5). Envelope 20×47×14 mm (0.787×1.85×0.551 in) with a 13.5 mm radial section height, C 12.7 kN, C0 3.4 kN and Pu 0.18 kN. The open 11204 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 20 mm shaft. Limiting speed 9000 r/min, catalogue mass 180 g.",
    "applications": [
      "woodworking machine cutter shafts",
      "locating-bearing positions on long shafts",
      "conveyor pulleys needing a wide inner-ring seat",
      "shafts with a single locating bearing against a shoulder"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "the extended inner ring acting as a thrust collar: never use it to carry axial load — locate with a shaft shoulder or locknut instead",
      "uneven loading of the two ball rows if the extended ring is not seated square on the shaft",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.18 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The fatigue load limit is 0.18 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The 112xx extended inner ring of 11204-ETN9 gives a wider shaft seat but the same 20×47×14 mm envelope as a 12xx of the same bore — the outer ring is interchangeable, the inner is not.",
      "The ETN9 suffix on 11204-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.18 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 20 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 11204-ETN9?",
        "a": "SKF 11204 ETN9 measures 20 mm bore × 47 mm OD × 14 mm width (0.787 × 1.85 × 0.551 in), mass about 180 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 11204 work?",
        "a": "The final two digits of 11204 are bore code 04, multiplied by 5 to give 20 mm."
      },
      {
        "q": "What is the speed rating of 11204-ETN9?",
        "a": "SKF publishes only the 9000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      },
      {
        "q": "How much misalignment can 11204-ETN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 11204-ETN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1204-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 1204 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "1204-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 1204 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "11204-ETN9",
      "11204 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "11205-ETN9",
    "brand": "SKF",
    "manufacturer_designation": "11205 ETN9",
    "series": "11200-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 4,
    "fatigue_load_limit_kN": 0.21,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 220,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 112xx series is SKF's extended-inner-ring self-aligning ball bearing: the inner ring is wider than the outer, giving a longer shaft seat for locating-bearing duty. the last two digits encode the bore: 11205 carries code 05 = 25 mm (code × 5). Envelope 25×52×15 mm (0.984×2.047×0.591 in) with a 13.5 mm radial section height, C 14.3 kN, C0 4 kN and Pu 0.21 kN. The open 11205 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 25 mm shaft. Limiting speed 8000 r/min, catalogue mass 220 g.",
    "applications": [
      "shafts with a single locating bearing against a shoulder",
      "agricultural machinery driven shafts",
      "fan shafts with thermal expansion take-up",
      "woodworking machine cutter shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "uneven loading of the two ball rows if the extended ring is not seated square on the shaft",
      "the extended inner ring acting as a thrust collar: never use it to carry axial load — locate with a shaft shoulder or locknut instead",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded",
      "brinelling from static overload or hammer blows during mounting"
    ],
    "pitfalls": [
      "At 25 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Mount 11205-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The extended inner ring is not a thrust collar — it cannot carry axial load; use a locknut or shaft shoulder for thrust location.",
      "The ETN9 suffix on 11205-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 8000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Mount 11205-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "The fatigue load limit is 0.21 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 11205-ETN9?",
        "a": "SKF 11205 ETN9 measures 25 mm bore × 52 mm OD × 15 mm width (0.984 × 2.047 × 0.591 in), mass about 220 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 11205 work?",
        "a": "The final two digits of 11205 are bore code 05, multiplied by 5 to give 25 mm."
      },
      {
        "q": "What load can 11205-ETN9 take?",
        "a": "Catalogue values for 11205 ETN9: dynamic C 14.3 kN, static C0 4 kN, fatigue limit Pu 0.21 kN. Use C in life calculation and C0 for static checks at 25 mm bore."
      },
      {
        "q": "What is the speed rating of 11205-ETN9?",
        "a": "SKF publishes only the 8000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1205-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 1205 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "1205-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 1205 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "11205-ETN9",
      "11205 ETN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "11206-TN9",
    "brand": "SKF",
    "manufacturer_designation": "11206 TN9",
    "series": "11200-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 15.6,
    "static_load_kN": 4.65,
    "fatigue_load_limit_kN": 0.24,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 112xx series is SKF's extended-inner-ring self-aligning ball bearing: the inner ring is wider than the outer, giving a longer shaft seat for locating-bearing duty. the last two digits encode the bore: 11206 carries code 06 = 30 mm (code × 5). Envelope 30×62×16 mm (1.181×2.441×0.63 in) with a 16.0 mm radial section height, C 15.6 kN, C0 4.65 kN and Pu 0.24 kN. The open 11206 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 30 mm shaft. Limiting speed 6700 r/min, catalogue mass 350 g.",
    "applications": [
      "shafts with a single locating bearing against a shoulder",
      "agricultural machinery driven shafts",
      "fan shafts with thermal expansion take-up",
      "woodworking machine cutter shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "uneven loading of the two ball rows if the extended ring is not seated square on the shaft",
      "the extended inner ring acting as a thrust collar: never use it to carry axial load — locate with a shaft shoulder or locknut instead",
      "electrical pitting in VFD-driven motors without shaft grounding",
      "excessive misalignment loading one ball row heavily and spalling it early"
    ],
    "pitfalls": [
      "Mount 11206-TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.",
      "Fillet radii must clear the 11206-TN9 chamfer so the 16 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The 112xx extended inner ring of 11206-TN9 gives a wider shaft seat but the same 30×62×16 mm envelope as a 12xx of the same bore — the outer ring is interchangeable, the inner is not.",
      "The TN9 suffix on 11206-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6700 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Fillet radii must clear the 11206-TN9 chamfer so the 16 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 11206-TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 11206-TN9?",
        "a": "SKF 11206 TN9 measures 30 mm bore × 62 mm OD × 16 mm width (1.181 × 2.441 × 0.63 in), mass about 350 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 11206 work?",
        "a": "The final two digits of 11206 are bore code 06, multiplied by 5 to give 30 mm."
      },
      {
        "q": "Which fits should I use for 11206-TN9?",
        "a": "With a rotating inner ring use roughly k5 on the shaft and H7 in the 62 mm housing; reverse the interference if the outer ring rotates."
      },
      {
        "q": "How heavy is 11206-TN9?",
        "a": "Catalogue mass is 350 g for 11206 TN9; seal and cage executions of the same envelope differ by a few grams."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1206-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 1206 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "1206-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 1206 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "11206-TN9",
      "11206 TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "11207-TN9",
    "brand": "SKF",
    "manufacturer_designation": "11207 TN9",
    "series": "11200-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19,
    "static_load_kN": 6,
    "fatigue_load_limit_kN": 0.305,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 540,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 112xx series is SKF's extended-inner-ring self-aligning ball bearing: the inner ring is wider than the outer, giving a longer shaft seat for locating-bearing duty. the last two digits encode the bore: 11207 carries code 07 = 35 mm (code × 5). Envelope 35×72×17 mm (1.378×2.835×0.669 in) with a 18.5 mm radial section height, C 19 kN, C0 6 kN and Pu 0.305 kN. The open 11207 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 35 mm shaft. Limiting speed 5600 r/min, catalogue mass 540 g.",
    "applications": [
      "woodworking machine cutter shafts",
      "locating-bearing positions on long shafts",
      "conveyor pulleys needing a wide inner-ring seat",
      "shafts with a single locating bearing against a shoulder"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "the extended inner ring acting as a thrust collar: never use it to carry axial load — locate with a shaft shoulder or locknut instead",
      "uneven loading of the two ball rows if the extended ring is not seated square on the shaft",
      "fretting corrosion on a creeping shaft or housing seat",
      "cage damage from running beyond the limiting speed"
    ],
    "pitfalls": [
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 11207-TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "Catalogue ratings for 11207-TN9 (C 19 kN, C0 6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The 112xx extended inner ring of 11207-TN9 gives a wider shaft seat but the same 35×72×17 mm envelope as a 12xx of the same bore — the outer ring is interchangeable, the inner is not.",
      "The TN9 suffix on 11207-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5600 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Catalogue ratings for 11207-TN9 (C 19 kN, C0 6 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "Mount 11207-TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 11207-TN9?",
        "a": "SKF 11207 TN9 measures 35 mm bore × 72 mm OD × 17 mm width (1.378 × 2.835 × 0.669 in), mass about 540 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 11207 work?",
        "a": "The final two digits of 11207 are bore code 07, multiplied by 5 to give 35 mm."
      },
      {
        "q": "What is the speed rating of 11207-TN9?",
        "a": "SKF publishes only the 5600 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      },
      {
        "q": "How much misalignment can 11207-TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 11207-TN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1207-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 1207 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "1207-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 1207 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "11207-TN9",
      "11207 TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "11208-TN9",
    "brand": "SKF",
    "manufacturer_designation": "11208 TN9",
    "series": "11200-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19,
    "static_load_kN": 6.55,
    "fatigue_load_limit_kN": 0.335,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 112xx series is SKF's extended-inner-ring self-aligning ball bearing: the inner ring is wider than the outer, giving a longer shaft seat for locating-bearing duty. the last two digits encode the bore: 11208 carries code 08 = 40 mm (code × 5). Envelope 40×80×18 mm (1.575×3.15×0.709 in) with a 20.0 mm radial section height, C 19 kN, C0 6.55 kN and Pu 0.335 kN. The open 11208 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 40 mm shaft. Limiting speed 5000 r/min, catalogue mass 720 g.",
    "applications": [
      "locating-bearing positions on long shafts",
      "conveyor pulleys needing a wide inner-ring seat",
      "shafts with a single locating bearing against a shoulder",
      "agricultural machinery driven shafts"
    ],
    "failure_modes": [
      "lubricant starvation where no regreasing interval is maintained",
      "contamination wear when the open arrangement is used without adequate external sealing",
      "uneven loading of the two ball rows if the extended ring is not seated square on the shaft",
      "the extended inner ring acting as a thrust collar: never use it to carry axial load — locate with a shaft shoulder or locknut instead",
      "cage damage from running beyond the limiting speed",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring: on a 40 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "At 40 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.",
      "Use 11208-TN9 as a locating bearing: the extended inner ring sits against a shaft shoulder, while the non-locating bearing floats to take up thermal expansion.",
      "The TN9 suffix on 11208-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "Assign interference to the rotating ring: on a 40 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.",
      "Catalogue ratings for 11208-TN9 (C 19 kN, C0 6.55 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 11208-TN9?",
        "a": "SKF 11208 TN9 measures 40 mm bore × 80 mm OD × 18 mm width (1.575 × 3.15 × 0.709 in), mass about 720 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 11208 work?",
        "a": "The final two digits of 11208 are bore code 08, multiplied by 5 to give 40 mm."
      },
      {
        "q": "How much misalignment can 11208-TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 11208-TN9 allow less (about 1°) because the seal lip binds first."
      },
      {
        "q": "Can 11208-TN9 take axial load?",
        "a": "A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1208-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 1208 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "1208-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 1208 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "11208-TN9",
      "11208 TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "11209-TN9",
    "brand": "SKF",
    "manufacturer_designation": "11209 TN9",
    "series": "11200-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.9,
    "static_load_kN": 7.8,
    "fatigue_load_limit_kN": 0.4,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 770,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 112xx series is SKF's extended-inner-ring self-aligning ball bearing: the inner ring is wider than the outer, giving a longer shaft seat for locating-bearing duty. the last two digits encode the bore: 11209 carries code 09 = 45 mm (code × 5). Envelope 45×85×19 mm (1.772×3.346×0.748 in) with a 20.0 mm radial section height, C 22.9 kN, C0 7.8 kN and Pu 0.4 kN. The open 11209 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 45 mm shaft. Limiting speed 4500 r/min, catalogue mass 770 g.",
    "applications": [
      "agricultural machinery driven shafts",
      "fan shafts with thermal expansion take-up",
      "woodworking machine cutter shafts",
      "locating-bearing positions on long shafts"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "the extended inner ring acting as a thrust collar: never use it to carry axial load — locate with a shaft shoulder or locknut instead",
      "uneven loading of the two ball rows if the extended ring is not seated square on the shaft",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 11209-TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 11209-TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.",
      "The 112xx extended inner ring of 11209-TN9 gives a wider shaft seat but the same 45×85×19 mm envelope as a 12xx of the same bore — the outer ring is interchangeable, the inner is not.",
      "The TN9 suffix on 11209-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.4 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 45 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 11209-TN9?",
        "a": "SKF 11209 TN9 measures 45 mm bore × 85 mm OD × 19 mm width (1.772 × 3.346 × 0.748 in), mass about 770 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 11209 work?",
        "a": "The final two digits of 11209 are bore code 09, multiplied by 5 to give 45 mm."
      },
      {
        "q": "What is the speed rating of 11209-TN9?",
        "a": "SKF publishes only the 4500 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      },
      {
        "q": "How much misalignment can 11209-TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 11209-TN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1209-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 1209 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "1209-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 1209 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "11209-TN9",
      "11209 TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "11210-TN9",
    "brand": "SKF",
    "manufacturer_designation": "11210 TN9",
    "series": "11200-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 9.15,
    "fatigue_load_limit_kN": 0.475,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 112xx series is SKF's extended-inner-ring self-aligning ball bearing: the inner ring is wider than the outer, giving a longer shaft seat for locating-bearing duty. the last two digits encode the bore: 11210 carries code 10 = 50 mm (code × 5). Envelope 50×90×20 mm (1.969×3.543×0.787 in) with a 20.0 mm radial section height, C 26.5 kN, C0 9.15 kN and Pu 0.475 kN. The open 11210 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 50 mm shaft. Limiting speed 4300 r/min, catalogue mass 850 g.",
    "applications": [
      "woodworking machine cutter shafts",
      "locating-bearing positions on long shafts",
      "conveyor pulleys needing a wide inner-ring seat",
      "shafts with a single locating bearing against a shoulder"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "the extended inner ring acting as a thrust collar: never use it to carry axial load — locate with a shaft shoulder or locknut instead",
      "uneven loading of the two ball rows if the extended ring is not seated square on the shaft",
      "excessive misalignment loading one ball row heavily and spalling it early",
      "rolling-contact fatigue spalling once the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "The fatigue load limit is 0.475 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "Catalogue ratings for 11210-TN9 (C 26.5 kN, C0 9.15 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.",
      "The 112xx extended inner ring of 11210-TN9 gives a wider shaft seat but the same 50×90×20 mm envelope as a 12xx of the same bore — the outer ring is interchangeable, the inner is not.",
      "The TN9 suffix on 11210-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4300 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The spherical outer raceway lets 11210-TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "Fillet radii must clear the 11210-TN9 chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 11210-TN9?",
        "a": "SKF 11210 TN9 measures 50 mm bore × 90 mm OD × 20 mm width (1.969 × 3.543 × 0.787 in), mass about 850 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 11210 work?",
        "a": "The final two digits of 11210 are bore code 10, multiplied by 5 to give 50 mm."
      },
      {
        "q": "What is the speed rating of 11210-TN9?",
        "a": "SKF publishes only the 4300 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      },
      {
        "q": "How much misalignment can 11210-TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 11210-TN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1210-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 1210 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "1210-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 1210 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "11210-TN9",
      "11210 TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "11212-TN9",
    "brand": "SKF",
    "manufacturer_designation": "11212 TN9",
    "series": "11200-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 31.2,
    "static_load_kN": 12.2,
    "fatigue_load_limit_kN": 0.62,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The 112xx series is SKF's extended-inner-ring self-aligning ball bearing: the inner ring is wider than the outer, giving a longer shaft seat for locating-bearing duty. the last two digits encode the bore: 11212 carries code 12 = 60 mm (code × 5). Envelope 60×110×22 mm (2.362×4.331×0.866 in) with a 25.0 mm radial section height, C 31.2 kN, C0 12.2 kN and Pu 0.62 kN. The open 11212 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 60 mm shaft. Limiting speed 3400 r/min, catalogue mass 1150 g.",
    "applications": [
      "woodworking machine cutter shafts",
      "locating-bearing positions on long shafts",
      "conveyor pulleys needing a wide inner-ring seat",
      "shafts with a single locating bearing against a shoulder"
    ],
    "failure_modes": [
      "contamination wear when the open arrangement is used without adequate external sealing",
      "lubricant starvation where no regreasing interval is maintained",
      "the extended inner ring acting as a thrust collar: never use it to carry axial load — locate with a shaft shoulder or locknut instead",
      "uneven loading of the two ball rows if the extended ring is not seated square on the shaft",
      "brinelling from static overload or hammer blows during mounting",
      "false brinelling from vibration while the shaft stands idle"
    ],
    "pitfalls": [
      "The spherical outer raceway lets 11212-TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.",
      "The fatigue load limit is 0.62 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "The 112xx extended inner ring of 11212-TN9 gives a wider shaft seat but the same 60×110×22 mm envelope as a 12xx of the same bore — the outer ring is interchangeable, the inner is not.",
      "The TN9 suffix on 11212-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 3400 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.",
      "The fatigue load limit is 0.62 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.",
      "At 60 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast."
    ],
    "faq": [
      {
        "q": "What are the dimensions of 11212-TN9?",
        "a": "SKF 11212 TN9 measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 1150 g. It is open, with no shields or seals."
      },
      {
        "q": "How does the bore code in 11212 work?",
        "a": "The final two digits of 11212 are bore code 12, multiplied by 5 to give 60 mm."
      },
      {
        "q": "What is the speed rating of 11212-TN9?",
        "a": "SKF publishes only the 3400 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern."
      },
      {
        "q": "How much misalignment can 11212-TN9 tolerate?",
        "a": "Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 11212-TN9 allow less (about 1°) because the seal lip binds first."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "1212-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 1212 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      },
      {
        "equiv_sku": "1212-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 1212 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "11212-TN9",
      "11212 TN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7200-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7200 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 7.02,
    "static_load_kN": 3.35,
    "fatigue_load_limit_kN": 0.14,
    "reference_speed_rpm": 30000,
    "limiting_speed_rpm": 30000,
    "max_rpm": 30000,
    "weight_g": 30,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7200 BECBP is SKF's 10 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 10×30×9 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 10×30×9 mm (0.394×1.181×0.354 in), 10.0 mm radial section height, C 7.02 kN, C0 3.35 kN, Pu 0.14 kN.reference speed 30,000 r/min (thermal) and limiting speed 30,000 r/min (mechanical), which coincide for this size, catalogue mass 30 g. Load balance: C0 3.35 kN against C 7.02 kN gives a 0.48 ratio, typical of a steep-angle axial-oriented design; Pu 0.14 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 10 mm bore: 7.02 kN C divided by the 10.0 mm radial section height gives 0.7 kN per section millimetre; the 30 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 30 over bore 10 is a 3.00× step for this size, and the 9 mm width gives a bore/width ratio of 1.11; use these ratios when housing space around the 10 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "miniature turbine and gyro drives",
      "high-speed engraving and routing spindles",
      "small machine-tool spindles and high-speed heads"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BECBP unit is ground for arbitrary pairing, a basic execution is not.",
      "Assign interference to the rotating ring — roughly j5 on a 10 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Assign interference to the rotating ring — roughly j5 on a 10 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7200-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7200-BECBP?",
        "a": "7200 BECBP measures 10 mm bore × 30 mm OD × 9 mm width (0.394 × 1.181 × 0.354 in), mass about 30 g. SKF 17000 ratings: C 7.02 kN, C0 3.35 kN, Pu 0.14 kN, reference speed 30,000 r/min (thermal) and limiting speed 30,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7200-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 30,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7200-BECBP?",
        "a": "The 30,000 r/min reference (thermal) and 30,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7200-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7200-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×30×9 mm envelope with catalogue ratings within 10 %; 7200 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7200",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7200 BEP is the basic 10×30×9 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7200-BECBP",
      "7200 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7200-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7200 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 7.02,
    "static_load_kN": 3.35,
    "fatigue_load_limit_kN": 0.14,
    "reference_speed_rpm": 30000,
    "limiting_speed_rpm": 30000,
    "max_rpm": 30000,
    "weight_g": 30,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7200 BEP is SKF's 10 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 10×30×9 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 10×30×9 mm (0.394×1.181×0.354 in), 10.0 mm radial section height, C 7.02 kN, C0 3.35 kN, Pu 0.14 kN.reference speed 30,000 r/min (thermal) and limiting speed 30,000 r/min (mechanical), which coincide for this size, catalogue mass 30 g. Sizing arithmetic on the 10 mm bore: 7.02 kN C divided by the 10.0 mm radial section height gives 0.7 kN per section millimetre; the 30 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. The 0.14 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 7.02/3.35 kN ratings and 30 g mass this execution carries about 0.70 kN of C per millimetre of bore. Bore-to-OD planning: OD 30 over bore 10 is a 3.00× step for this size, and the 9 mm width gives a bore/width ratio of 1.11; use these ratios when housing space around the 10 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "textile and wire-guide spindles",
      "small gear and metering pumps",
      "encoder and resolver mountings"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Assign interference to the rotating ring — roughly j5 on a 10 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7200-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7200 BEP as the single basic pa66 execution; the other order numbers of the 7200 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7200-BEP?",
        "a": "7200 BEP measures 10 mm bore × 30 mm OD × 9 mm width (0.394 × 1.181 × 0.354 in), mass about 30 g. SKF 17000 ratings: C 7.02 kN, C0 3.35 kN, Pu 0.14 kN, reference speed 30,000 r/min (thermal) and limiting speed 30,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7200-BEP?",
        "a": "With a rotating inner ring use roughly j5 on the 10 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7200-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7200-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×30×9 mm envelope with catalogue ratings within 10 %; 7200 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7200",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7200 BEP is the basic 10×30×9 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7200-BEP",
      "7200 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7201-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7201 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 7.61,
    "static_load_kN": 3.8,
    "fatigue_load_limit_kN": 0.16,
    "reference_speed_rpm": 28000,
    "limiting_speed_rpm": 26000,
    "max_rpm": 26000,
    "weight_g": 36,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7201 BECBP is SKF's 12 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 12×32×10 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 12×32×10 mm (0.472×1.26×0.394 in), 10.0 mm radial section height, C 7.61 kN, C0 3.8 kN, Pu 0.16 kN.reference speed 28,000 r/min (thermal) and limiting speed 26,000 r/min (mechanical), catalogue mass 36 g. At the printed limiting speed of 26,000 r/min the mean pitch diameter dm ≈ 22.0 mm implies a dn value around 572k mm·r/min; the 28,000 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 10 mm width over a 10.0 mm section yields 1.00 mm of ring width per section millimetre, and the bearing weighs 36 g for 7.61 kN of dynamic capacity — about 5 g per rated kN. Bore-to-OD planning: OD 32 over bore 12 is a 2.67× step for this size, and the 10 mm width gives a bore/width ratio of 1.20; use these ratios when housing space around the 12 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "high-speed engraving and routing spindles",
      "small machine-tool spindles and high-speed heads",
      "servo and stepper motor shafts"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Fillet radii must clear the chamfer so the 10 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Fillet radii must clear the chamfer so the 10 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7201-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7201-BECBP?",
        "a": "7201 BECBP measures 12 mm bore × 32 mm OD × 10 mm width (0.472 × 1.26 × 0.394 in), mass about 36 g. SKF 17000 ratings: C 7.61 kN, C0 3.8 kN, Pu 0.16 kN, reference speed 28,000 r/min (thermal) and limiting speed 26,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7201-BECBP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7201-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7201-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×32×10 mm envelope with catalogue ratings within 10 %; 7201 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7201",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7201 BEP is the basic 12×32×10 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7201-BECBP",
      "7201 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7201-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7201 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 7.61,
    "static_load_kN": 3.8,
    "fatigue_load_limit_kN": 0.16,
    "reference_speed_rpm": 28000,
    "limiting_speed_rpm": 26000,
    "max_rpm": 26000,
    "weight_g": 36,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7201 BEP is SKF's 12 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 12×32×10 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 12×32×10 mm (0.472×1.26×0.394 in), 10.0 mm radial section height, C 7.61 kN, C0 3.8 kN, Pu 0.16 kN.reference speed 28,000 r/min (thermal) and limiting speed 26,000 r/min (mechanical), catalogue mass 36 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 26,000 r/min while thermal balance under catalogue load sets the 28,000 r/min reference; at dm ≈ 22.0 mm the corresponding dn is approximately 572k mm·r/min. Sizing arithmetic on the 12 mm bore: 7.61 kN C divided by the 10.0 mm radial section height gives 0.8 kN per section millimetre; the 36 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 32 over bore 12 is a 2.67× step for this size, and the 10 mm width gives a bore/width ratio of 1.20; use these ratios when housing space around the 12 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "dental and laboratory high-speed rotors",
      "miniature turbine and gyro drives",
      "high-speed engraving and routing spindles"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Fillet radii must clear the chamfer so the 10 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7201-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7201 BEP as the single basic pa66 execution; the other order numbers of the 7201 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7201-BEP?",
        "a": "7201 BEP measures 12 mm bore × 32 mm OD × 10 mm width (0.472 × 1.26 × 0.394 in), mass about 36 g. SKF 17000 ratings: C 7.61 kN, C0 3.8 kN, Pu 0.16 kN, reference speed 28,000 r/min (thermal) and limiting speed 26,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7201-BEP?",
        "a": "The 28,000 r/min reference (thermal) and 26,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7201-BEP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7201-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7201-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×32×10 mm envelope with catalogue ratings within 10 %; 7201 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7201",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7201 BEP is the basic 12×32×10 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7201-BEP",
      "7201 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7301-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7301 BE-2RZP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 12,
    "D_mm": 37,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 10.6,
    "static_load_kN": 5,
    "fatigue_load_limit_kN": 0.208,
    "reference_speed_rpm": 26000,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 60,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7301 BE-2RZP is SKF's 12 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 12×37×12 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 12×37×12 mm (0.472×1.457×0.472 in), 12.5 mm radial section height, C 10.6 kN, C0 5 kN, Pu 0.208 kN.reference speed 26,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical), catalogue mass 60 g. Sizing arithmetic on the 12 mm bore: 10.6 kN C divided by the 12.5 mm radial section height gives 0.8 kN per section millimetre; the 60 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. The 0.208 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 10.6/5 kN ratings and 60 g mass this execution carries about 0.88 kN of C per millimetre of bore. Bore-to-OD planning: OD 37 over bore 12 is a 3.08× step for this size, and the 12 mm width gives a bore/width ratio of 1.00; use these ratios when housing space around the 12 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "textile and wire-guide spindles",
      "small gear and metering pumps",
      "encoder and resolver mountings"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7301-BE-2RZP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7301-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7301-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7301-BE-2RZP?",
        "a": "7301 BE-2RZP measures 12 mm bore × 37 mm OD × 12 mm width (0.472 × 1.457 × 0.472 in), mass about 60 g. SKF 17000 ratings: C 10.6 kN, C0 5 kN, Pu 0.208 kN, reference speed 26,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "Can one 7301-BE-2RZP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7301-BE-2RZP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7301-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7301-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×37×12 mm envelope with catalogue ratings within 10 %; 7301 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7301",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7301 BEP is the basic 12×37×12 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7301-BE-2RZP",
      "7301 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7301-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7301 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 12,
    "D_mm": 37,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 10.6,
    "static_load_kN": 5,
    "fatigue_load_limit_kN": 0.208,
    "reference_speed_rpm": 26000,
    "limiting_speed_rpm": 24000,
    "max_rpm": 24000,
    "weight_g": 60,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7301 BEP is SKF's 12 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 12×37×12 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 12×37×12 mm (0.472×1.457×0.472 in), 12.5 mm radial section height, C 10.6 kN, C0 5 kN, Pu 0.208 kN.reference speed 26,000 r/min (thermal) and limiting speed 24,000 r/min (mechanical), catalogue mass 60 g. Sizing arithmetic on the 12 mm bore: 10.6 kN C divided by the 12.5 mm radial section height gives 0.8 kN per section millimetre; the 60 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. The 0.208 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 10.6/5 kN ratings and 60 g mass this execution carries about 0.88 kN of C per millimetre of bore. Bore-to-OD planning: OD 37 over bore 12 is a 3.08× step for this size, and the 12 mm width gives a bore/width ratio of 1.00; use these ratios when housing space around the 12 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "textile and wire-guide spindles",
      "small gear and metering pumps",
      "encoder and resolver mountings"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly j5 on a 12 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7301-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7301 BEP as the single basic pa66 execution; the other order numbers of the 7301 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7301-BEP?",
        "a": "7301 BEP measures 12 mm bore × 37 mm OD × 12 mm width (0.472 × 1.457 × 0.472 in), mass about 60 g. SKF 17000 ratings: C 10.6 kN, C0 5 kN, Pu 0.208 kN, reference speed 26,000 r/min (thermal) and limiting speed 24,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which grease and fill for 7301-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 24,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7301-BEP?",
        "a": "The 26,000 r/min reference (thermal) and 24,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7301-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7301-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×37×12 mm envelope with catalogue ratings within 10 %; 7301 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7301",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7301 BEP is the basic 12×37×12 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7301-BEP",
      "7301 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7202-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7202 BE-2RZP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 8.32,
    "static_load_kN": 4.4,
    "fatigue_load_limit_kN": 0.183,
    "reference_speed_rpm": 24000,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 45,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7202 BE-2RZP is SKF's 15 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 15×35×11 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 15×35×11 mm (0.591×1.378×0.433 in), 10.0 mm radial section height, C 8.32 kN, C0 4.4 kN, Pu 0.183 kN.reference speed 24,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical), catalogue mass 45 g. Mass and section check: 45 g inside the 15×35×11 mm outline leaves a 10.0 mm radial section, and the 4.4 kN static rating is 0.53× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 4.4 kN against C 8.32 kN gives a 0.53 ratio, typical of a steep-angle axial-oriented design; Pu 0.183 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 24,000 r/min against a 20,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.20. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "small machine-tool spindles and high-speed heads",
      "servo and stepper motor shafts",
      "textile and wire-guide spindles"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7202-BE-2RZP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Do not mix execution classes inside one set: a universally matchable BE-2RZP unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7202-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7202-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7202-BE-2RZP?",
        "a": "7202 BE-2RZP measures 15 mm bore × 35 mm OD × 11 mm width (0.591 × 1.378 × 0.433 in), mass about 45 g. SKF 17000 ratings: C 8.32 kN, C0 4.4 kN, Pu 0.183 kN, reference speed 24,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7202-BE-2RZP?",
        "a": "With a rotating inner ring use roughly j5 on the 15 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7202-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7202-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×11 mm envelope with catalogue ratings within 10 %; 7202 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7202-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×11 mm envelope with catalogue ratings within 10 %; 7202 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7202-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (8.32/4.4 kN vs 10.2/5.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-202-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (8.32/4.4 kN vs 12.7/8.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7202",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7202 BEP is the basic 15×35×11 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7202-BE-2RZP",
      "7202 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7202-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7202 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 8.32,
    "static_load_kN": 4.4,
    "fatigue_load_limit_kN": 0.183,
    "reference_speed_rpm": 24000,
    "limiting_speed_rpm": 24000,
    "max_rpm": 24000,
    "weight_g": 45,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7202 BEP is SKF's 15 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 15×35×11 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 15×35×11 mm (0.591×1.378×0.433 in), 10.0 mm radial section height, C 8.32 kN, C0 4.4 kN, Pu 0.183 kN.reference speed 24,000 r/min (thermal) and limiting speed 24,000 r/min (mechanical), which coincide for this size, catalogue mass 45 g. Mass and section check: 45 g inside the 15×35×11 mm outline leaves a 10.0 mm radial section, and the 4.4 kN static rating is 0.53× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 4.4 kN against C 8.32 kN gives a 0.53 ratio, typical of a steep-angle axial-oriented design; Pu 0.183 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 24,000 r/min against a 24,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "small machine-tool spindles and high-speed heads",
      "servo and stepper motor shafts",
      "textile and wire-guide spindles"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "At 15 mm bore the j5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7202-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7202 BEP as the single basic pa66 execution; the other order numbers of the 7202 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7202-BEP?",
        "a": "7202 BEP measures 15 mm bore × 35 mm OD × 11 mm width (0.591 × 1.378 × 0.433 in), mass about 45 g. SKF 17000 ratings: C 8.32 kN, C0 4.4 kN, Pu 0.183 kN, reference speed 24,000 r/min (thermal) and limiting speed 24,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7202-BEP?",
        "a": "With a rotating inner ring use roughly j5 on the 15 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7202-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7202-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×11 mm envelope with catalogue ratings within 10 %; 7202 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7202-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×11 mm envelope with catalogue ratings within 10 %; 7202 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7202-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (8.32/4.4 kN vs 10.2/5.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-202-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (8.32/4.4 kN vs 12.7/8.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7202",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7202 BEP is the basic 15×35×11 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7202-BEP",
      "7202 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7202-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7202 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 8.8,
    "static_load_kN": 4.65,
    "fatigue_load_limit_kN": 0.196,
    "reference_speed_rpm": 24000,
    "limiting_speed_rpm": 26000,
    "max_rpm": 26000,
    "weight_g": 45,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7202 BECBP is SKF's 15 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 15×35×11 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 15×35×11 mm (0.591×1.378×0.433 in), 10.0 mm radial section height, C 8.8 kN, C0 4.65 kN, Pu 0.196 kN.reference speed 24,000 r/min (thermal) and limiting speed 26,000 r/min (mechanical), catalogue mass 45 g. Sizing arithmetic on the 15 mm bore: 8.8 kN C divided by the 10.0 mm radial section height gives 0.9 kN per section millimetre; the 45 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 45 g inside the 15×35×11 mm outline leaves a 10.0 mm radial section, and the 4.65 kN static rating is 0.53× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 24,000 r/min against a 26,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.92. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "encoder and resolver mountings",
      "dental and laboratory high-speed rotors",
      "miniature turbine and gyro drives"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "fretting corrosion on a loose rotating shaft seat",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Fillet radii must clear the chamfer so the 11 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "At 15 mm bore the j5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7202-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7202-BECBP?",
        "a": "7202 BECBP measures 15 mm bore × 35 mm OD × 11 mm width (0.591 × 1.378 × 0.433 in), mass about 45 g. SKF 17000 ratings: C 8.8 kN, C0 4.65 kN, Pu 0.196 kN, reference speed 24,000 r/min (thermal) and limiting speed 26,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7202-BECBP?",
        "a": "With a rotating inner ring use roughly j5 on the 15 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7202-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7202-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×11 mm envelope with catalogue ratings within 10 %; 7202 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7202-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×11 mm envelope with catalogue ratings within 10 %; 7202 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7202-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (8.8/4.65 kN vs 10.2/5.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-202-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (8.8/4.65 kN vs 12.7/8.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7202",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7202 BEP is the basic 15×35×11 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7202-BECBP",
      "7202 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7202-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7202 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 10.2,
    "static_load_kN": 5.2,
    "fatigue_load_limit_kN": 0.224,
    "reference_speed_rpm": 26000,
    "limiting_speed_rpm": 40000,
    "max_rpm": 40000,
    "weight_g": 45,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7202 ACCBM is SKF's 15 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 15×35×11 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 15×35×11 mm (0.591×1.378×0.433 in), 10.0 mm radial section height, C 10.2 kN, C0 5.2 kN, Pu 0.224 kN.reference speed 26,000 r/min (thermal) and limiting speed 40,000 r/min (mechanical), catalogue mass 45 g. Envelope economics: the 11 mm width over a 10.0 mm section yields 1.10 mm of ring width per section millimetre, and the bearing weighs 45 g for 10.2 kN of dynamic capacity — about 4 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 40,000 r/min while thermal balance under catalogue load sets the 26,000 r/min reference; at dm ≈ 25.0 mm the corresponding dn is approximately 1,000k mm·r/min. Bore-to-OD planning: OD 35 over bore 15 is a 2.33× step for this size, and the 11 mm width gives a bore/width ratio of 1.36; use these ratios when housing space around the 15 mm shaft is the first constraint. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "dental and laboratory high-speed rotors",
      "miniature turbine and gyro drives",
      "high-speed engraving and routing spindles"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly j5 on a 15 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 0,55 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Do not mix execution classes inside one set: a universally matchable ACCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Assign interference to the rotating ring — roughly j5 on a 15 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The 25° AC angle of 7202-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7202-ACCBM?",
        "a": "7202 ACCBM measures 15 mm bore × 35 mm OD × 11 mm width (0.591 × 1.378 × 0.433 in), mass about 45 g. SKF 17000 ratings: C 10.2 kN, C0 5.2 kN, Pu 0.224 kN, reference speed 26,000 r/min (thermal) and limiting speed 40,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7202-ACCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7202-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7202-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (10.2/5.2 kN vs 8.32/4.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7202-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (10.2/5.2 kN vs 8.32/4.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7202-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (10.2/5.2 kN vs 8.8/4.65 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-202-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (10.2/5.2 kN vs 12.7/8.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7202",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7202 BEP shares the 15×35×11 mm angular-contact envelope, but catalogue C/C0 differ (10.2/5.2 kN vs 8.32/4.4 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7202-ACCBM",
      "7202 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7302-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7302 BE-2RZP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 13,
    "static_load_kN": 6.7,
    "fatigue_load_limit_kN": 0.28,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 17000,
    "max_rpm": 17000,
    "weight_g": 82,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7302 BE-2RZP is SKF's 15 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 15×42×13 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 15×42×13 mm (0.591×1.654×0.512 in), 13.5 mm radial section height, C 13 kN, C0 6.7 kN, Pu 0.28 kN.reference speed 22,000 r/min (thermal) and limiting speed 17,000 r/min (mechanical), catalogue mass 82 g. Envelope economics: the 13 mm width over a 13.5 mm section yields 0.96 mm of ring width per section millimetre, and the bearing weighs 82 g for 13 kN of dynamic capacity — about 6 g per rated kN. Mass and section check: 82 g inside the 15×42×13 mm outline leaves a 13.5 mm radial section, and the 6.7 kN static rating is 0.52× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 22,000 r/min against a 17,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.29. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "small gear and metering pumps",
      "encoder and resolver mountings",
      "dental and laboratory high-speed rotors"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "At 15 mm bore the j5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7302-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7302-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7302-BE-2RZP?",
        "a": "7302 BE-2RZP measures 15 mm bore × 42 mm OD × 13 mm width (0.591 × 1.654 × 0.512 in), mass about 82 g. SKF 17000 ratings: C 13 kN, C0 6.7 kN, Pu 0.28 kN, reference speed 22,000 r/min (thermal) and limiting speed 17,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "Which fits should I use for 7302-BE-2RZP?",
        "a": "With a rotating inner ring use roughly j5 on the 15 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7302-BE-2RZP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 17,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7302-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7302-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×13 mm envelope with catalogue ratings within 10 %; 7302 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7302-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×13 mm envelope with catalogue ratings within 10 %; 7302 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7302",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7302 BEP is the basic 15×42×13 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7302-BE-2RZP",
      "7302 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7302-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7302 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 13,
    "static_load_kN": 6.7,
    "fatigue_load_limit_kN": 0.28,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 80,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7302 BECBP is SKF's 15 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 15×42×13 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 15×42×13 mm (0.591×1.654×0.512 in), 13.5 mm radial section height, C 13 kN, C0 6.7 kN, Pu 0.28 kN.reference speed 22,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical), catalogue mass 80 g. Selection figures for 7302 BECBP: the static-to-dynamic ratio C0/C is 0.52, Pu 0.28 kN is about 2 % of C, and catalogue mass works out to roughly 5 g per millimetre of bore. At the printed limiting speed of 20,000 r/min the mean pitch diameter dm ≈ 28.5 mm implies a dn value around 570k mm·r/min; the 22,000 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 22,000 r/min against a 20,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.10. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "dental and laboratory high-speed rotors",
      "miniature turbine and gyro drives",
      "high-speed engraving and routing spindles"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "brinelling from pressing the ring home through the balls or from static overload",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7302-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7302-BECBP?",
        "a": "7302 BECBP measures 15 mm bore × 42 mm OD × 13 mm width (0.591 × 1.654 × 0.512 in), mass about 80 g. SKF 17000 ratings: C 13 kN, C0 6.7 kN, Pu 0.28 kN, reference speed 22,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7302-BECBP?",
        "a": "With a rotating inner ring use roughly j5 on the 15 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7302-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 20,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7302-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7302-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×13 mm envelope with catalogue ratings within 10 %; 7302 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7302-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×13 mm envelope with catalogue ratings within 10 %; 7302 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7302",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7302 BEP is the basic 15×42×13 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7302-BECBP",
      "7302 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7302-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7302 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 13,
    "static_load_kN": 6.7,
    "fatigue_load_limit_kN": 0.28,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 80,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7302 BEP is SKF's 15 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 15×42×13 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 15×42×13 mm (0.591×1.654×0.512 in), 13.5 mm radial section height, C 13 kN, C0 6.7 kN, Pu 0.28 kN.reference speed 22,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical), catalogue mass 80 g. Envelope economics: the 13 mm width over a 13.5 mm section yields 0.96 mm of ring width per section millimetre, and the bearing weighs 80 g for 13 kN of dynamic capacity — about 6 g per rated kN. Mass and section check: 80 g inside the 15×42×13 mm outline leaves a 13.5 mm radial section, and the 6.7 kN static rating is 0.52× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 22,000 r/min against a 20,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.10. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "small gear and metering pumps",
      "encoder and resolver mountings",
      "dental and laboratory high-speed rotors"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 13 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Fillet radii must clear the chamfer so the 13 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7302-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7302 BEP as the single basic pa66 execution; the other order numbers of the 7302 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7302-BEP?",
        "a": "7302 BEP measures 15 mm bore × 42 mm OD × 13 mm width (0.591 × 1.654 × 0.512 in), mass about 80 g. SKF 17000 ratings: C 13 kN, C0 6.7 kN, Pu 0.28 kN, reference speed 22,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which fits should I use for 7302-BEP?",
        "a": "With a rotating inner ring use roughly j5 on the 15 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7302-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 20,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7302-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7302-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×13 mm envelope with catalogue ratings within 10 %; 7302 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7302-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×13 mm envelope with catalogue ratings within 10 %; 7302 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7302",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7302 BEP is the basic 15×42×13 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7302-BEP",
      "7302 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7203-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7203 BE-2RZP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 10.4,
    "static_load_kN": 5.5,
    "fatigue_load_limit_kN": 0.236,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 17000,
    "max_rpm": 17000,
    "weight_g": 63,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7203 BE-2RZP is SKF's 17 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 17×40×12 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 17×40×12 mm (0.669×1.575×0.472 in), 11.5 mm radial section height, C 10.4 kN, C0 5.5 kN, Pu 0.236 kN.reference speed 22,000 r/min (thermal) and limiting speed 17,000 r/min (mechanical), catalogue mass 63 g. Envelope economics: the 12 mm width over a 11.5 mm section yields 1.04 mm of ring width per section millimetre, and the bearing weighs 63 g for 10.4 kN of dynamic capacity — about 6 g per rated kN. Mass and section check: 63 g inside the 17×40×12 mm outline leaves a 11.5 mm radial section, and the 5.5 kN static rating is 0.53× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 22,000 r/min against a 17,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.29. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "small gear and metering pumps",
      "encoder and resolver mountings",
      "dental and laboratory high-speed rotors"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "At 17 mm bore the j5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "One 7203-BE-2RZP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Fillet radii must clear the chamfer so the 12 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7203-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7203-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7203-BE-2RZP?",
        "a": "7203 BE-2RZP measures 17 mm bore × 40 mm OD × 12 mm width (0.669 × 1.575 × 0.472 in), mass about 63 g. SKF 17000 ratings: C 10.4 kN, C0 5.5 kN, Pu 0.236 kN, reference speed 22,000 r/min (thermal) and limiting speed 17,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7203-BE-2RZP?",
        "a": "The 22,000 r/min reference (thermal) and 17,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7203-BE-2RZP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7203-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7203-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BEY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (10.4/5.5 kN vs 11.1/6.1 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (10.4/5.5 kN vs 12.5/6.7 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-203-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (10.4/5.5 kN vs 17/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7203 BEP is the basic 17×40×12 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7203-BE-2RZP",
      "7203 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7203-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7203 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 10.4,
    "static_load_kN": 5.5,
    "fatigue_load_limit_kN": 0.236,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 65,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7203 BEP is SKF's 17 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 17×40×12 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 17×40×12 mm (0.669×1.575×0.472 in), 11.5 mm radial section height, C 10.4 kN, C0 5.5 kN, Pu 0.236 kN.reference speed 22,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical), catalogue mass 65 g. Envelope economics: the 12 mm width over a 11.5 mm section yields 1.04 mm of ring width per section millimetre, and the bearing weighs 65 g for 10.4 kN of dynamic capacity — about 6 g per rated kN. Mass and section check: 65 g inside the 17×40×12 mm outline leaves a 11.5 mm radial section, and the 5.5 kN static rating is 0.53× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 22,000 r/min against a 20,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.10. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "small gear and metering pumps",
      "encoder and resolver mountings",
      "dental and laboratory high-speed rotors"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "One 7203-BEP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7203-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7203 BEP as the single basic pa66 execution; the other order numbers of the 7203 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7203-BEP?",
        "a": "7203 BEP measures 17 mm bore × 40 mm OD × 12 mm width (0.669 × 1.575 × 0.472 in), mass about 65 g. SKF 17000 ratings: C 10.4 kN, C0 5.5 kN, Pu 0.236 kN, reference speed 22,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What minimum axial load does 7203-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7203-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7203-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BEY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (10.4/5.5 kN vs 11.1/6.1 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (10.4/5.5 kN vs 12.5/6.7 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-203-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (10.4/5.5 kN vs 17/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7203 BEP is the basic 17×40×12 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7203-BEP",
      "7203 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7203-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7203 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 11,
    "static_load_kN": 5.85,
    "fatigue_load_limit_kN": 0.25,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 22000,
    "max_rpm": 22000,
    "weight_g": 65,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7203 BECBP is SKF's 17 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 17×40×12 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 17×40×12 mm (0.669×1.575×0.472 in), 11.5 mm radial section height, C 11 kN, C0 5.85 kN, Pu 0.25 kN.reference speed 22,000 r/min (thermal) and limiting speed 22,000 r/min (mechanical), which coincide for this size, catalogue mass 65 g. Selection figures for 7203 BECBP: the static-to-dynamic ratio C0/C is 0.53, Pu 0.25 kN is about 2 % of C, and catalogue mass works out to roughly 4 g per millimetre of bore. At the printed limiting speed of 22,000 r/min the mean pitch diameter dm ≈ 28.5 mm implies a dn value around 627k mm·r/min; the 22,000 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 22,000 r/min against a 22,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "dental and laboratory high-speed rotors",
      "miniature turbine and gyro drives",
      "high-speed engraving and routing spindles"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "brinelling from pressing the ring home through the balls or from static overload",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Do not mix execution classes inside one set: a universally matchable BECBP unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7203-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7203-BECBP?",
        "a": "7203 BECBP measures 17 mm bore × 40 mm OD × 12 mm width (0.669 × 1.575 × 0.472 in), mass about 65 g. SKF 17000 ratings: C 11 kN, C0 5.85 kN, Pu 0.25 kN, reference speed 22,000 r/min (thermal) and limiting speed 22,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7203-BECBP?",
        "a": "The 22,000 r/min reference (thermal) and 22,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7203-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7203-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7203-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (11/5.85 kN vs 12.5/6.7 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-203-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (11/5.85 kN vs 17/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7203 BEP is the basic 17×40×12 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7203-BECBP",
      "7203 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7203-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7203 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 11,
    "static_load_kN": 5.85,
    "fatigue_load_limit_kN": 0.25,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 28000,
    "max_rpm": 28000,
    "weight_g": 65,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7203 BECBM is SKF's 17 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 17×40×12 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 17×40×12 mm (0.669×1.575×0.472 in), 11.5 mm radial section height, C 11 kN, C0 5.85 kN, Pu 0.25 kN.reference speed 22,000 r/min (thermal) and limiting speed 28,000 r/min (mechanical), catalogue mass 65 g. Sizing arithmetic on the 17 mm bore: 11 kN C divided by the 11.5 mm radial section height gives 1.0 kN per section millimetre; the 65 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 65 g inside the 17×40×12 mm outline leaves a 11.5 mm radial section, and the 5.85 kN static rating is 0.53× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 22,000 r/min against a 28,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.79. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "encoder and resolver mountings",
      "dental and laboratory high-speed rotors",
      "miniature turbine and gyro drives"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "fretting corrosion on a loose rotating shaft seat",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Assign interference to the rotating ring — roughly j5 on a 17 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "At 17 mm bore the j5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7203-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7203-BECBM?",
        "a": "7203 BECBM measures 17 mm bore × 40 mm OD × 12 mm width (0.669 × 1.575 × 0.472 in), mass about 65 g. SKF 17000 ratings: C 11 kN, C0 5.85 kN, Pu 0.25 kN, reference speed 22,000 r/min (thermal) and limiting speed 28,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7203-BECBM?",
        "a": "With a rotating inner ring use roughly j5 on the 17 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7203-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7203-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (11/5.85 kN vs 12.5/6.7 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-203-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (11/5.85 kN vs 17/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7203 BEP is the basic 17×40×12 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7203-BECBM",
      "7203 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7203-BEY",
    "brand": "SKF",
    "manufacturer_designation": "7203 BEY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 11.1,
    "static_load_kN": 6.1,
    "fatigue_load_limit_kN": 0.26,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 65,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7203 BEY is SKF's 17 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 17×40×12 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. The BEY is a basic single bearing with a stamped brass Y cage — a single unit, not a universally matchable one.. Envelope 17×40×12 mm (0.669×1.575×0.472 in), 11.5 mm radial section height, C 11.1 kN, C0 6.1 kN, Pu 0.26 kN.reference speed 22,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical), catalogue mass 65 g. At the printed limiting speed of 20,000 r/min the mean pitch diameter dm ≈ 28.5 mm implies a dn value around 570k mm·r/min; the 22,000 r/min reference speed is the thermal-planning figure under catalogue load. Selection figures for 7203 BEY: the static-to-dynamic ratio C0/C is 0.55, Pu 0.26 kN is about 2 % of C, and catalogue mass works out to roughly 4 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 22,000 r/min against a 20,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.10. Ordering note: BEY is the basic single bearing with the stamped brass strip cage (Y) — light and oil-additive tolerant, but not ground on the side faces for set mounting; order BECBY for a universally matchable stamped-brass unit.",
    "applications": [
      "high-speed engraving and routing spindles",
      "small machine-tool spindles and high-speed heads",
      "servo and stepper motor shafts"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7203-BEY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7203 BEY as the single basic stamped brass execution; the other order numbers of the 7203 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7203-BEY?",
        "a": "7203 BEY measures 17 mm bore × 40 mm OD × 12 mm width (0.669 × 1.575 × 0.472 in), mass about 65 g. SKF 17000 ratings: C 11.1 kN, C0 6.1 kN, Pu 0.26 kN, reference speed 22,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. The BEY is a basic single bearing with a stamped brass Y cage — a single unit, not a universally matchable one.."
      },
      {
        "q": "Which fits should I use for 7203-BEY?",
        "a": "With a rotating inner ring use roughly j5 on the 17 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7203-BEY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 20,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7203-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7203-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (11.1/6.1 kN vs 10.4/5.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (11.1/6.1 kN vs 10.4/5.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope with catalogue ratings within 10 %; 7203 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7203-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (11.1/6.1 kN vs 12.5/6.7 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-203-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (11.1/6.1 kN vs 17/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7203 BEP shares the 17×40×12 mm angular-contact envelope, but catalogue C/C0 differ (11.1/6.1 kN vs 10.4/5.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7203-BEY",
      "7203 BEY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7203-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7203 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 12.5,
    "static_load_kN": 6.7,
    "fatigue_load_limit_kN": 0.285,
    "reference_speed_rpm": 24000,
    "limiting_speed_rpm": 34000,
    "max_rpm": 34000,
    "weight_g": 65,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7203 ACCBM is SKF's 17 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 17×40×12 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 17×40×12 mm (0.669×1.575×0.472 in), 11.5 mm radial section height, C 12.5 kN, C0 6.7 kN, Pu 0.285 kN.reference speed 24,000 r/min (thermal) and limiting speed 34,000 r/min (mechanical), catalogue mass 65 g. Sizing arithmetic on the 17 mm bore: 12.5 kN C divided by the 11.5 mm radial section height gives 1.1 kN per section millimetre; the 65 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 65 g inside the 17×40×12 mm outline leaves a 11.5 mm radial section, and the 6.7 kN static rating is 0.54× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 40 over bore 17 is a 2.35× step for this size, and the 12 mm width gives a bore/width ratio of 1.42; use these ratios when housing space around the 17 mm shaft is the first constraint. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "small machine-tool spindles and high-speed heads",
      "servo and stepper motor shafts",
      "textile and wire-guide spindles"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly j5 on a 17 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Assign interference to the rotating ring — roughly j5 on a 17 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Do not mix execution classes inside one set: a universally matchable ACCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The 25° AC angle of 7203-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7203-ACCBM?",
        "a": "7203 ACCBM measures 17 mm bore × 40 mm OD × 12 mm width (0.669 × 1.575 × 0.472 in), mass about 65 g. SKF 17000 ratings: C 12.5 kN, C0 6.7 kN, Pu 0.285 kN, reference speed 24,000 r/min (thermal) and limiting speed 34,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7203-ACCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 25° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7203-ACCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7203-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7203-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (12.5/6.7 kN vs 10.4/5.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (12.5/6.7 kN vs 10.4/5.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (12.5/6.7 kN vs 11/5.85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (12.5/6.7 kN vs 11/5.85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-BEY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (12.5/6.7 kN vs 11.1/6.1 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-203-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (12.5/6.7 kN vs 17/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7203 BEP shares the 17×40×12 mm angular-contact envelope, but catalogue C/C0 differ (12.5/6.7 kN vs 10.4/5.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7203-ACCBM",
      "7203 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7303-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7303 BE-2RZP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 15.9,
    "static_load_kN": 8.3,
    "fatigue_load_limit_kN": 0.355,
    "reference_speed_rpm": 20000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7303 BE-2RZP is SKF's 17 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 17×47×14 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 17×47×14 mm (0.669×1.85×0.551 in), 15.0 mm radial section height, C 15.9 kN, C0 8.3 kN, Pu 0.355 kN.reference speed 20,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical), catalogue mass 110 g. Mass and section check: 110 g inside the 17×47×14 mm outline leaves a 15.0 mm radial section, and the 8.3 kN static rating is 0.52× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 8.3 kN against C 15.9 kN gives a 0.52 ratio, typical of a steep-angle axial-oriented design; Pu 0.355 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 20,000 r/min against a 15,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.33. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "small machine-tool spindles and high-speed heads",
      "servo and stepper motor shafts",
      "textile and wire-guide spindles"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "One 7303-BE-2RZP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Do not mix execution classes inside one set: a universally matchable BE-2RZP unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7303-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7303-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7303-BE-2RZP?",
        "a": "7303 BE-2RZP measures 17 mm bore × 47 mm OD × 14 mm width (0.669 × 1.85 × 0.551 in), mass about 110 g. SKF 17000 ratings: C 15.9 kN, C0 8.3 kN, Pu 0.355 kN, reference speed 20,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "Which grease and fill for 7303-BE-2RZP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 15,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7303-BE-2RZP?",
        "a": "The 20,000 r/min reference (thermal) and 15,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7303-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7303-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×14 mm envelope with catalogue ratings within 10 %; 7303 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7303-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×14 mm envelope with catalogue ratings within 10 %; 7303 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-303-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope, but catalogue C/C0 differ between executions (15.9/8.3 kN vs 23.4/15 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7303",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7303 BEP is the basic 17×47×14 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7303-BE-2RZP",
      "7303 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7303-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7303 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 15.9,
    "static_load_kN": 8.3,
    "fatigue_load_limit_kN": 0.355,
    "reference_speed_rpm": 20000,
    "limiting_speed_rpm": 19000,
    "max_rpm": 19000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7303 BECBP is SKF's 17 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 17×47×14 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 17×47×14 mm (0.669×1.85×0.551 in), 15.0 mm radial section height, C 15.9 kN, C0 8.3 kN, Pu 0.355 kN.reference speed 20,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical), catalogue mass 110 g. Sizing arithmetic on the 17 mm bore: 15.9 kN C divided by the 15.0 mm radial section height gives 1.1 kN per section millimetre; the 110 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 110 g inside the 17×47×14 mm outline leaves a 15.0 mm radial section, and the 8.3 kN static rating is 0.52× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 20,000 r/min against a 19,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.05. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "encoder and resolver mountings",
      "dental and laboratory high-speed rotors",
      "miniature turbine and gyro drives"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "fretting corrosion on a loose rotating shaft seat",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Assign interference to the rotating ring — roughly j5 on a 17 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7303-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7303-BECBP?",
        "a": "7303 BECBP measures 17 mm bore × 47 mm OD × 14 mm width (0.669 × 1.85 × 0.551 in), mass about 110 g. SKF 17000 ratings: C 15.9 kN, C0 8.3 kN, Pu 0.355 kN, reference speed 20,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7303-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7303-BECBP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7303-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7303-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×14 mm envelope with catalogue ratings within 10 %; 7303 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7303-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×14 mm envelope with catalogue ratings within 10 %; 7303 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-303-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope, but catalogue C/C0 differ between executions (15.9/8.3 kN vs 23.4/15 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7303",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7303 BEP is the basic 17×47×14 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7303-BECBP",
      "7303 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7303-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7303 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 15.9,
    "static_load_kN": 8.3,
    "fatigue_load_limit_kN": 0.355,
    "reference_speed_rpm": 20000,
    "limiting_speed_rpm": 19000,
    "max_rpm": 19000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7303 BEP is SKF's 17 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 17×47×14 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 17×47×14 mm (0.669×1.85×0.551 in), 15.0 mm radial section height, C 15.9 kN, C0 8.3 kN, Pu 0.355 kN.reference speed 20,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical), catalogue mass 110 g. Mass and section check: 110 g inside the 17×47×14 mm outline leaves a 15.0 mm radial section, and the 8.3 kN static rating is 0.52× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 8.3 kN against C 15.9 kN gives a 0.52 ratio, typical of a steep-angle axial-oriented design; Pu 0.355 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 20,000 r/min against a 19,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.05. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "small machine-tool spindles and high-speed heads",
      "servo and stepper motor shafts",
      "textile and wire-guide spindles"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7303-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7303 BEP as the single basic pa66 execution; the other order numbers of the 7303 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7303-BEP?",
        "a": "7303 BEP measures 17 mm bore × 47 mm OD × 14 mm width (0.669 × 1.85 × 0.551 in), mass about 110 g. SKF 17000 ratings: C 15.9 kN, C0 8.3 kN, Pu 0.355 kN, reference speed 20,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Can one 7303-BEP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7303-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7303-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7303-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×14 mm envelope with catalogue ratings within 10 %; 7303 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7303-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×14 mm envelope with catalogue ratings within 10 %; 7303 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-303-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope, but catalogue C/C0 differ between executions (15.9/8.3 kN vs 23.4/15 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7303",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7303 BEP is the basic 17×47×14 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7303-BEP",
      "7303 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7204-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7204 BE-2RZP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 13.3,
    "static_load_kN": 7.65,
    "fatigue_load_limit_kN": 0.325,
    "reference_speed_rpm": 19000,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7204 BE-2RZP is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 20×47×14 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 20×47×14 mm (0.787×1.85×0.551 in), 13.5 mm radial section height, C 13.3 kN, C0 7.65 kN, Pu 0.325 kN.reference speed 19,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical), catalogue mass 150 g. The 0.325 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 13.3/7.65 kN ratings and 150 g mass this execution carries about 0.67 kN of C per millimetre of bore. Sizing arithmetic on the 20 mm bore: 13.3 kN C divided by the 13.5 mm radial section height gives 1.0 kN per section millimetre; the 150 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 47 over bore 20 is a 2.35× step for this size, and the 14 mm width gives a bore/width ratio of 1.43; use these ratios when housing space around the 20 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "miniature turbine and gyro drives",
      "high-speed engraving and routing spindles",
      "small machine-tool spindles and high-speed heads"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BE-2RZP unit is ground for arbitrary pairing, a basic execution is not.",
      "Fillet radii must clear the chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring — roughly k5 on a 20 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7204-BE-2RZP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7204-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7204-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7204-BE-2RZP?",
        "a": "7204 BE-2RZP measures 20 mm bore × 47 mm OD × 14 mm width (0.787 × 1.85 × 0.551 in), mass about 150 g. SKF 17000 ratings: C 13.3 kN, C0 7.65 kN, Pu 0.325 kN, reference speed 19,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "Can one 7204-BE-2RZP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7204-BE-2RZP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7204-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7204-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope, but catalogue C/C0 differ between executions (13.3/7.65 kN vs 16/9.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7204",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7204 BEP is the basic 20×47×14 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7204-BE-2RZP",
      "7204 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7204-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7204 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 13.3,
    "static_load_kN": 7.65,
    "fatigue_load_limit_kN": 0.325,
    "reference_speed_rpm": 19000,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7204 BEP is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 20×47×14 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 20×47×14 mm (0.787×1.85×0.551 in), 13.5 mm radial section height, C 13.3 kN, C0 7.65 kN, Pu 0.325 kN.reference speed 19,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical), catalogue mass 110 g. The 0.325 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 13.3/7.65 kN ratings and 110 g mass this execution carries about 0.67 kN of C per millimetre of bore. Sizing arithmetic on the 20 mm bore: 13.3 kN C divided by the 13.5 mm radial section height gives 1.0 kN per section millimetre; the 110 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 47 over bore 20 is a 2.35× step for this size, and the 14 mm width gives a bore/width ratio of 1.43; use these ratios when housing space around the 20 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "miniature turbine and gyro drives",
      "high-speed engraving and routing spindles",
      "small machine-tool spindles and high-speed heads"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "One 7204-BEP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "One 7204-BEP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7204-BEP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7204-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7204 BEP as the single basic pa66 execution; the other order numbers of the 7204 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7204-BEP?",
        "a": "7204 BEP measures 20 mm bore × 47 mm OD × 14 mm width (0.787 × 1.85 × 0.551 in), mass about 110 g. SKF 17000 ratings: C 13.3 kN, C0 7.65 kN, Pu 0.325 kN, reference speed 19,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which grease and fill for 7204-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 18,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7204-BEP?",
        "a": "The 19,000 r/min reference (thermal) and 18,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7204-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7204-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope, but catalogue C/C0 differ between executions (13.3/7.65 kN vs 16/9.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7204",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7204 BEP is the basic 20×47×14 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7204-BEP",
      "7204 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7204-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7204 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 8.15,
    "fatigue_load_limit_kN": 0.345,
    "reference_speed_rpm": 19000,
    "limiting_speed_rpm": 19000,
    "max_rpm": 19000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7204 BECBP is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 20×47×14 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 20×47×14 mm (0.787×1.85×0.551 in), 13.5 mm radial section height, C 14.3 kN, C0 8.15 kN, Pu 0.345 kN.reference speed 19,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical), which coincide for this size, catalogue mass 110 g. Mass and section check: 110 g inside the 20×47×14 mm outline leaves a 13.5 mm radial section, and the 8.15 kN static rating is 0.57× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 0.345 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 14.3/8.15 kN ratings and 110 g mass this execution carries about 0.72 kN of C per millimetre of bore. Bore-to-OD planning: OD 47 over bore 20 is a 2.35× step for this size, and the 14 mm width gives a bore/width ratio of 1.43; use these ratios when housing space around the 20 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "textile and wire-guide spindles",
      "small gear and metering pumps",
      "encoder and resolver mountings"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "At 20 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "At 20 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7204-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7204-BECBP?",
        "a": "7204 BECBP measures 20 mm bore × 47 mm OD × 14 mm width (0.787 × 1.85 × 0.551 in), mass about 110 g. SKF 17000 ratings: C 14.3 kN, C0 8.15 kN, Pu 0.345 kN, reference speed 19,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7204-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 19,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7204-BECBP?",
        "a": "The 19,000 r/min reference (thermal) and 19,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7204-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7204-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope, but catalogue C/C0 differ between executions (14.3/8.15 kN vs 16/9.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7204",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7204 BEP is the basic 20×47×14 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7204-BECBP",
      "7204 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7204-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7204 BECBPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 8.15,
    "fatigue_load_limit_kN": 0.345,
    "reference_speed_rpm": 19000,
    "limiting_speed_rpm": 19000,
    "max_rpm": 19000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7204 BECBPH is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 20×47×14 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 20×47×14 mm (0.787×1.85×0.551 in), 13.5 mm radial section height, C 14.3 kN, C0 8.15 kN, Pu 0.345 kN.reference speed 19,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical), which coincide for this size, catalogue mass 110 g. The 0.345 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 14.3/8.15 kN ratings and 110 g mass this execution carries about 0.72 kN of C per millimetre of bore. Selection figures for 7204 BECBPH: the static-to-dynamic ratio C0/C is 0.57, Pu 0.345 kN is about 2 % of C, and catalogue mass works out to roughly 6 g per millimetre of bore. Bore-to-OD planning: OD 47 over bore 20 is a 2.35× step for this size, and the 14 mm width gives a bore/width ratio of 1.43; use these ratios when housing space around the 20 mm shaft is the first constraint. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "textile and wire-guide spindles",
      "small gear and metering pumps",
      "encoder and resolver mountings"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "raceway staining from water in the lubricant during idle periods",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 20 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Fillet radii must clear the chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7204-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7204-BECBPH?",
        "a": "7204 BECBPH measures 20 mm bore × 47 mm OD × 14 mm width (0.787 × 1.85 × 0.551 in), mass about 110 g. SKF 17000 ratings: C 14.3 kN, C0 8.15 kN, Pu 0.345 kN, reference speed 19,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "Can one 7204-BECBPH take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7204-BECBPH need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7204-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7204-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope, but catalogue C/C0 differ between executions (14.3/8.15 kN vs 16/9.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7204",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7204 BEP is the basic 20×47×14 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7204-BECBPH",
      "7204 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7204-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7204 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 8.15,
    "fatigue_load_limit_kN": 0.345,
    "reference_speed_rpm": 19000,
    "limiting_speed_rpm": 19000,
    "max_rpm": 19000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7204 BECBY is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 20×47×14 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 20×47×14 mm (0.787×1.85×0.551 in), 13.5 mm radial section height, C 14.3 kN, C0 8.15 kN, Pu 0.345 kN.reference speed 19,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical), which coincide for this size, catalogue mass 110 g. Sizing arithmetic on the 20 mm bore: 14.3 kN C divided by the 13.5 mm radial section height gives 1.1 kN per section millimetre; the 110 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. The 0.345 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 14.3/8.15 kN ratings and 110 g mass this execution carries about 0.72 kN of C per millimetre of bore. Bore-to-OD planning: OD 47 over bore 20 is a 2.35× step for this size, and the 14 mm width gives a bore/width ratio of 1.43; use these ratios when housing space around the 20 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "textile and wire-guide spindles",
      "small gear and metering pumps",
      "encoder and resolver mountings"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Fillet radii must clear the chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7204-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7204-BECBY?",
        "a": "7204 BECBY measures 20 mm bore × 47 mm OD × 14 mm width (0.787 × 1.85 × 0.551 in), mass about 110 g. SKF 17000 ratings: C 14.3 kN, C0 8.15 kN, Pu 0.345 kN, reference speed 19,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which grease and fill for 7204-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 19,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7204-BECBY?",
        "a": "The 19,000 r/min reference (thermal) and 19,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7204-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7204-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope, but catalogue C/C0 differ between executions (14.3/8.15 kN vs 16/9.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7204",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7204 BEP is the basic 20×47×14 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7204-BECBY",
      "7204 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7204-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7204 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 8.15,
    "fatigue_load_limit_kN": 0.345,
    "reference_speed_rpm": 19000,
    "limiting_speed_rpm": 24000,
    "max_rpm": 24000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7204 BECBM is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 20×47×14 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 20×47×14 mm (0.787×1.85×0.551 in), 13.5 mm radial section height, C 14.3 kN, C0 8.15 kN, Pu 0.345 kN.reference speed 19,000 r/min (thermal) and limiting speed 24,000 r/min (mechanical), catalogue mass 110 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 24,000 r/min while thermal balance under catalogue load sets the 19,000 r/min reference; at dm ≈ 33.5 mm the corresponding dn is approximately 804k mm·r/min. Selection figures for 7204 BECBM: the static-to-dynamic ratio C0/C is 0.57, Pu 0.345 kN is about 2 % of C, and catalogue mass works out to roughly 6 g per millimetre of bore. Bore-to-OD planning: OD 47 over bore 20 is a 2.35× step for this size, and the 14 mm width gives a bore/width ratio of 1.43; use these ratios when housing space around the 20 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "small gear and metering pumps",
      "encoder and resolver mountings",
      "dental and laboratory high-speed rotors"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "One 7204-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7204-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7204-BECBM?",
        "a": "7204 BECBM measures 20 mm bore × 47 mm OD × 14 mm width (0.787 × 1.85 × 0.551 in), mass about 110 g. SKF 17000 ratings: C 14.3 kN, C0 8.15 kN, Pu 0.345 kN, reference speed 19,000 r/min (thermal) and limiting speed 24,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7204-BECBM?",
        "a": "With a rotating inner ring use roughly k5 on the 20 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7204-BECBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 24,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7204-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7204-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope with catalogue ratings within 10 %; 7204 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7204-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope, but catalogue C/C0 differ between executions (14.3/8.15 kN vs 16/9.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7204",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7204 BEP is the basic 20×47×14 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7204-BECBM",
      "7204 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7204-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7204 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 16,
    "static_load_kN": 9.3,
    "fatigue_load_limit_kN": 0.39,
    "reference_speed_rpm": 20000,
    "limiting_speed_rpm": 30000,
    "max_rpm": 30000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7204 ACCBM is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 20×47×14 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 20×47×14 mm (0.787×1.85×0.551 in), 13.5 mm radial section height, C 16 kN, C0 9.3 kN, Pu 0.39 kN.reference speed 20,000 r/min (thermal) and limiting speed 30,000 r/min (mechanical), catalogue mass 110 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 30,000 r/min while thermal balance under catalogue load sets the 20,000 r/min reference; at dm ≈ 33.5 mm the corresponding dn is approximately 1,005k mm·r/min. Selection figures for 7204 ACCBM: the static-to-dynamic ratio C0/C is 0.58, Pu 0.39 kN is about 2 % of C, and catalogue mass works out to roughly 6 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 20,000 r/min against a 30,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.67. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "high-speed engraving and routing spindles",
      "small machine-tool spindles and high-speed heads",
      "servo and stepper motor shafts"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable ACCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "At 20 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The 25° AC angle of 7204-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7204-ACCBM?",
        "a": "7204 ACCBM measures 20 mm bore × 47 mm OD × 14 mm width (0.787 × 1.85 × 0.551 in), mass about 110 g. SKF 17000 ratings: C 16 kN, C0 9.3 kN, Pu 0.39 kN, reference speed 20,000 r/min (thermal) and limiting speed 30,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7204-ACCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7204-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7204-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope, but catalogue C/C0 differ between executions (16/9.3 kN vs 13.3/7.65 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7204-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope, but catalogue C/C0 differ between executions (16/9.3 kN vs 13.3/7.65 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7204-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope, but catalogue C/C0 differ between executions (16/9.3 kN vs 14.3/8.15 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7204-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope, but catalogue C/C0 differ between executions (16/9.3 kN vs 14.3/8.15 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7204-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope, but catalogue C/C0 differ between executions (16/9.3 kN vs 14.3/8.15 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7204-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope, but catalogue C/C0 differ between executions (16/9.3 kN vs 14.3/8.15 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7204 BEP shares the 20×47×14 mm angular-contact envelope, but catalogue C/C0 differ (16/9.3 kN vs 13.3/7.65 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7204-ACCBM",
      "7204 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7304-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7304 BE-2RZP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 17.4,
    "static_load_kN": 9.5,
    "fatigue_load_limit_kN": 0.4,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7304 BE-2RZP is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 20×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 20×52×15 mm (0.787×2.047×0.591 in), 16.0 mm radial section height, C 17.4 kN, C0 9.5 kN, Pu 0.4 kN.reference speed 17,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical), catalogue mass 140 g. At the printed limiting speed of 13,000 r/min the mean pitch diameter dm ≈ 36.0 mm implies a dn value around 468k mm·r/min; the 17,000 r/min reference speed is the thermal-planning figure under catalogue load. The 0.4 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 17.4/9.5 kN ratings and 140 g mass this execution carries about 0.87 kN of C per millimetre of bore. Bore-to-OD planning: OD 52 over bore 20 is a 2.60× step for this size, and the 15 mm width gives a bore/width ratio of 1.33; use these ratios when housing space around the 20 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "servo and stepper motor shafts",
      "textile and wire-guide spindles",
      "small gear and metering pumps"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Fillet radii must clear the chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7304-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7304-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7304-BE-2RZP?",
        "a": "7304 BE-2RZP measures 20 mm bore × 52 mm OD × 15 mm width (0.787 × 2.047 × 0.591 in), mass about 140 g. SKF 17000 ratings: C 17.4 kN, C0 9.5 kN, Pu 0.4 kN, reference speed 17,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7304-BE-2RZP?",
        "a": "The 17,000 r/min reference (thermal) and 13,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7304-BE-2RZP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7304-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7304-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (17.4/9.5 kN vs 20.4/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (17.4/9.5 kN vs 20.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (17.4/9.5 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (17.4/9.5 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (17.4/9.5 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7304 BEP is the basic 20×52×15 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7304-BE-2RZP",
      "7304 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7304-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7304 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 17.4,
    "static_load_kN": 9.5,
    "fatigue_load_limit_kN": 0.4,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 16000,
    "max_rpm": 16000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7304 BEP is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 20×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 20×52×15 mm (0.787×2.047×0.591 in), 16.0 mm radial section height, C 17.4 kN, C0 9.5 kN, Pu 0.4 kN.reference speed 17,000 r/min (thermal) and limiting speed 16,000 r/min (mechanical), catalogue mass 140 g. At the printed limiting speed of 16,000 r/min the mean pitch diameter dm ≈ 36.0 mm implies a dn value around 576k mm·r/min; the 17,000 r/min reference speed is the thermal-planning figure under catalogue load. The 0.4 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 17.4/9.5 kN ratings and 140 g mass this execution carries about 0.87 kN of C per millimetre of bore. Bore-to-OD planning: OD 52 over bore 20 is a 2.60× step for this size, and the 15 mm width gives a bore/width ratio of 1.33; use these ratios when housing space around the 20 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "servo and stepper motor shafts",
      "textile and wire-guide spindles",
      "small gear and metering pumps"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7304-BEP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7304-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7304 BEP as the single basic pa66 execution; the other order numbers of the 7304 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7304-BEP?",
        "a": "7304 BEP measures 20 mm bore × 52 mm OD × 15 mm width (0.787 × 2.047 × 0.591 in), mass about 140 g. SKF 17000 ratings: C 17.4 kN, C0 9.5 kN, Pu 0.4 kN, reference speed 17,000 r/min (thermal) and limiting speed 16,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What minimum axial load does 7304-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7304-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7304-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (17.4/9.5 kN vs 20.4/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (17.4/9.5 kN vs 20.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (17.4/9.5 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (17.4/9.5 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (17.4/9.5 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7304 BEP is the basic 20×52×15 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7304-BEP",
      "7304 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7304-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7304 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 19,
    "static_load_kN": 10,
    "fatigue_load_limit_kN": 0.425,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7304 BECBP is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 20×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 20×52×15 mm (0.787×2.047×0.591 in), 16.0 mm radial section height, C 19 kN, C0 10 kN, Pu 0.425 kN.reference speed 17,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical), catalogue mass 140 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 18,000 r/min while thermal balance under catalogue load sets the 17,000 r/min reference; at dm ≈ 36.0 mm the corresponding dn is approximately 648k mm·r/min. Selection figures for 7304 BECBP: the static-to-dynamic ratio C0/C is 0.53, Pu 0.425 kN is about 2 % of C, and catalogue mass works out to roughly 7 g per millimetre of bore. Bore-to-OD planning: OD 52 over bore 20 is a 2.60× step for this size, and the 15 mm width gives a bore/width ratio of 1.33; use these ratios when housing space around the 20 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "small gear and metering pumps",
      "encoder and resolver mountings",
      "dental and laboratory high-speed rotors"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7304-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7304-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7304-BECBP?",
        "a": "7304 BECBP measures 20 mm bore × 52 mm OD × 15 mm width (0.787 × 2.047 × 0.591 in), mass about 140 g. SKF 17000 ratings: C 19 kN, C0 10 kN, Pu 0.425 kN, reference speed 17,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7304-BECBP?",
        "a": "The 17,000 r/min reference (thermal) and 18,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7304-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7304-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7304-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 20.4/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 20.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7304 BEP is the basic 20×52×15 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7304-BECBP",
      "7304 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7304-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7304 BECBPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 19,
    "static_load_kN": 10,
    "fatigue_load_limit_kN": 0.425,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7304 BECBPH is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 20×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 20×52×15 mm (0.787×2.047×0.591 in), 16.0 mm radial section height, C 19 kN, C0 10 kN, Pu 0.425 kN.reference speed 17,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical), catalogue mass 140 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 18,000 r/min while thermal balance under catalogue load sets the 17,000 r/min reference; at dm ≈ 36.0 mm the corresponding dn is approximately 648k mm·r/min. At the printed limiting speed of 18,000 r/min the mean pitch diameter dm ≈ 36.0 mm implies a dn value around 648k mm·r/min; the 17,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 52 over bore 20 is a 2.60× step for this size, and the 15 mm width gives a bore/width ratio of 1.33; use these ratios when housing space around the 20 mm shaft is the first constraint. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "servo and stepper motor shafts",
      "textile and wire-guide spindles",
      "small gear and metering pumps"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "One 7304-BECBPH locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7304-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7304-BECBPH?",
        "a": "7304 BECBPH measures 20 mm bore × 52 mm OD × 15 mm width (0.787 × 2.047 × 0.591 in), mass about 140 g. SKF 17000 ratings: C 19 kN, C0 10 kN, Pu 0.425 kN, reference speed 17,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7304-BECBPH?",
        "a": "The 17,000 r/min reference (thermal) and 18,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7304-BECBPH take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7304-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7304-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 20.4/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 20.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7304 BEP is the basic 20×52×15 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7304-BECBPH",
      "7304 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7304-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7304 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 19,
    "static_load_kN": 10,
    "fatigue_load_limit_kN": 0.425,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 22000,
    "max_rpm": 22000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7304 BECBM is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 20×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 20×52×15 mm (0.787×2.047×0.591 in), 16.0 mm radial section height, C 19 kN, C0 10 kN, Pu 0.425 kN.reference speed 17,000 r/min (thermal) and limiting speed 22,000 r/min (mechanical), catalogue mass 140 g. Mass and section check: 140 g inside the 20×52×15 mm outline leaves a 16.0 mm radial section, and the 10 kN static rating is 0.53× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 0.425 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 19/10 kN ratings and 140 g mass this execution carries about 0.95 kN of C per millimetre of bore. Bore-to-OD planning: OD 52 over bore 20 is a 2.60× step for this size, and the 15 mm width gives a bore/width ratio of 1.33; use these ratios when housing space around the 20 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "textile and wire-guide spindles",
      "small gear and metering pumps",
      "encoder and resolver mountings"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "One 7304-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Fillet radii must clear the chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7304-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7304-BECBM?",
        "a": "7304 BECBM measures 20 mm bore × 52 mm OD × 15 mm width (0.787 × 2.047 × 0.591 in), mass about 140 g. SKF 17000 ratings: C 19 kN, C0 10 kN, Pu 0.425 kN, reference speed 17,000 r/min (thermal) and limiting speed 22,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7304-BECBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 22,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7304-BECBM?",
        "a": "The 17,000 r/min reference (thermal) and 22,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7304-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7304-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 20.4/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 20.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (19/10 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7304 BEP is the basic 20×52×15 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7304-BECBM",
      "7304 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7304-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7304 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 20.4,
    "static_load_kN": 11.2,
    "fatigue_load_limit_kN": 0.475,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7304 BECBY is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 20×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 20×52×15 mm (0.787×2.047×0.591 in), 16.0 mm radial section height, C 20.4 kN, C0 11.2 kN, Pu 0.475 kN.reference speed 17,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical), catalogue mass 140 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 18,000 r/min while thermal balance under catalogue load sets the 17,000 r/min reference; at dm ≈ 36.0 mm the corresponding dn is approximately 648k mm·r/min. Sizing arithmetic on the 20 mm bore: 20.4 kN C divided by the 16.0 mm radial section height gives 1.3 kN per section millimetre; the 140 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 52 over bore 20 is a 2.60× step for this size, and the 15 mm width gives a bore/width ratio of 1.33; use these ratios when housing space around the 20 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "dental and laboratory high-speed rotors",
      "miniature turbine and gyro drives",
      "high-speed engraving and routing spindles"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BECBY unit is ground for arbitrary pairing, a basic execution is not.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "At 20 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7304-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7304-BECBY?",
        "a": "7304 BECBY measures 20 mm bore × 52 mm OD × 15 mm width (0.787 × 2.047 × 0.591 in), mass about 140 g. SKF 17000 ratings: C 20.4 kN, C0 11.2 kN, Pu 0.475 kN, reference speed 17,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What minimum axial load does 7304-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7304-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7304-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.4/11.2 kN vs 17.4/9.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.4/11.2 kN vs 17.4/9.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.4/11.2 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.4/11.2 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.4/11.2 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-ACCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 ACCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-304-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.4/11.2 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.4/11.2 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.4/11.2 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7304 BEP shares the 20×52×15 mm angular-contact envelope, but catalogue C/C0 differ (20.4/11.2 kN vs 17.4/9.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7304-BECBY",
      "7304 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7304-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7304 ACCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 20.8,
    "static_load_kN": 11.2,
    "fatigue_load_limit_kN": 0.475,
    "reference_speed_rpm": 19000,
    "limiting_speed_rpm": 26000,
    "max_rpm": 26000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7304 ACCBM is SKF's 20 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 25° (AC) contact angle, 20×52×15 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 20×52×15 mm (0.787×2.047×0.591 in), 16.0 mm radial section height, C 20.8 kN, C0 11.2 kN, Pu 0.475 kN.reference speed 19,000 r/min (thermal) and limiting speed 26,000 r/min (mechanical), catalogue mass 140 g. Load balance: C0 11.2 kN against C 20.8 kN gives a 0.54 ratio, typical of a steep-angle axial-oriented design; Pu 0.475 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 20 mm bore: 20.8 kN C divided by the 16.0 mm radial section height gives 1.3 kN per section millimetre; the 140 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 19,000 r/min against a 26,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.73. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "textile and wire-guide spindles",
      "small gear and metering pumps",
      "encoder and resolver mountings"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 20 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "One 7304-ACCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "One 7304-ACCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 0,55 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The 25° AC angle of 7304-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7304-ACCBM?",
        "a": "7304 ACCBM measures 20 mm bore × 52 mm OD × 15 mm width (0.787 × 2.047 × 0.591 in), mass about 140 g. SKF 17000 ratings: C 20.8 kN, C0 11.2 kN, Pu 0.475 kN, reference speed 19,000 r/min (thermal) and limiting speed 26,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7304-ACCBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 26,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7304-ACCBM?",
        "a": "The 19,000 r/min reference (thermal) and 26,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7304-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7304-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.8/11.2 kN vs 17.4/9.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.8/11.2 kN vs 17.4/9.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.8/11.2 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.8/11.2 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.8/11.2 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; 7304 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-304-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.8/11.2 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.8/11.2 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (20.8/11.2 kN vs 32/21.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7304 BEP shares the 20×52×15 mm angular-contact envelope, but catalogue C/C0 differ (20.8/11.2 kN vs 17.4/9.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7304-ACCBM",
      "7304 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7205-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7205 BE-2RZP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 14.8,
    "static_load_kN": 9.3,
    "fatigue_load_limit_kN": 0.4,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7205 BE-2RZP is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 25×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 25×52×15 mm (0.984×2.047×0.591 in), 13.5 mm radial section height, C 14.8 kN, C0 9.3 kN, Pu 0.4 kN.reference speed 16,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical), catalogue mass 130 g. At the printed limiting speed of 12,000 r/min the mean pitch diameter dm ≈ 38.5 mm implies a dn value around 462k mm·r/min; the 16,000 r/min reference speed is the thermal-planning figure under catalogue load. The 0.4 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 14.8/9.3 kN ratings and 130 g mass this execution carries about 0.59 kN of C per millimetre of bore. Bore-to-OD planning: OD 52 over bore 25 is a 2.08× step for this size, and the 15 mm width gives a bore/width ratio of 1.67; use these ratios when housing space around the 25 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Fillet radii must clear the chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring — roughly k5 on a 25 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Assign interference to the rotating ring — roughly k5 on a 25 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7205-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7205-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7205-BE-2RZP?",
        "a": "7205 BE-2RZP measures 25 mm bore × 52 mm OD × 15 mm width (0.984 × 2.047 × 0.591 in), mass about 130 g. SKF 17000 ratings: C 14.8 kN, C0 9.3 kN, Pu 0.4 kN, reference speed 16,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "What minimum axial load does 7205-BE-2RZP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7205-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (14.8/9.3 kN vs 18/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-205-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (14.8/9.3 kN vs 27/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7205 BEP is the basic 25×52×15 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7205-BE-2RZP",
      "7205 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7205-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7205 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 14.8,
    "static_load_kN": 9.3,
    "fatigue_load_limit_kN": 0.4,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7205 BEP is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 25×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 25×52×15 mm (0.984×2.047×0.591 in), 13.5 mm radial section height, C 14.8 kN, C0 9.3 kN, Pu 0.4 kN.reference speed 16,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical), catalogue mass 130 g. At the printed limiting speed of 15,000 r/min the mean pitch diameter dm ≈ 38.5 mm implies a dn value around 578k mm·r/min; the 16,000 r/min reference speed is the thermal-planning figure under catalogue load. The 0.4 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 14.8/9.3 kN ratings and 130 g mass this execution carries about 0.59 kN of C per millimetre of bore. Bore-to-OD planning: OD 52 over bore 25 is a 2.08× step for this size, and the 15 mm width gives a bore/width ratio of 1.67; use these ratios when housing space around the 25 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 25 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "One 7205-BEP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7205-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7205 BEP as the single basic pa66 execution; the other order numbers of the 7205 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7205-BEP?",
        "a": "7205 BEP measures 25 mm bore × 52 mm OD × 15 mm width (0.984 × 2.047 × 0.591 in), mass about 130 g. SKF 17000 ratings: C 14.8 kN, C0 9.3 kN, Pu 0.4 kN, reference speed 16,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What minimum axial load does 7205-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7205-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (14.8/9.3 kN vs 18/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-205-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (14.8/9.3 kN vs 27/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7205 BEP is the basic 25×52×15 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7205-BEP",
      "7205 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7205-BEY",
    "brand": "SKF",
    "manufacturer_designation": "7205 BEY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 14.8,
    "static_load_kN": 9.3,
    "fatigue_load_limit_kN": 0.4,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7205 BEY is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 25×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. The BEY is a basic single bearing with a stamped brass Y cage — a single unit, not a universally matchable one.. Envelope 25×52×15 mm (0.984×2.047×0.591 in), 13.5 mm radial section height, C 14.8 kN, C0 9.3 kN, Pu 0.4 kN.reference speed 16,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical), catalogue mass 130 g. Selection figures for 7205 BEY: the static-to-dynamic ratio C0/C is 0.63, Pu 0.4 kN is about 3 % of C, and catalogue mass works out to roughly 5 g per millimetre of bore. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 15,000 r/min while thermal balance under catalogue load sets the 16,000 r/min reference; at dm ≈ 38.5 mm the corresponding dn is approximately 578k mm·r/min. Bore-to-OD planning: OD 52 over bore 25 is a 2.08× step for this size, and the 15 mm width gives a bore/width ratio of 1.67; use these ratios when housing space around the 25 mm shaft is the first constraint. Ordering note: BEY is the basic single bearing with the stamped brass strip cage (Y) — light and oil-additive tolerant, but not ground on the side faces for set mounting; order BECBY for a universally matchable stamped-brass unit.",
    "applications": [
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brinelling from pressing the ring home through the balls or from static overload",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7205-BEY of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Do not mix execution classes inside one set: a universally matchable BEY unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7205-BEY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7205 BEY as the single basic stamped brass execution; the other order numbers of the 7205 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7205-BEY?",
        "a": "7205 BEY measures 25 mm bore × 52 mm OD × 15 mm width (0.984 × 2.047 × 0.591 in), mass about 130 g. SKF 17000 ratings: C 14.8 kN, C0 9.3 kN, Pu 0.4 kN, reference speed 16,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. The BEY is a basic single bearing with a stamped brass Y cage — a single unit, not a universally matchable one.."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7205-BEY?",
        "a": "The 16,000 r/min reference (thermal) and 15,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7205-BEY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7205-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (14.8/9.3 kN vs 18/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-205-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (14.8/9.3 kN vs 27/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7205 BEP is the basic 25×52×15 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7205-BEY",
      "7205 BEY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7205-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7205 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 15.6,
    "static_load_kN": 10,
    "fatigue_load_limit_kN": 0.43,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 17000,
    "max_rpm": 17000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7205 BECBP is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 25×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 25×52×15 mm (0.984×2.047×0.591 in), 13.5 mm radial section height, C 15.6 kN, C0 10 kN, Pu 0.43 kN.reference speed 16,000 r/min (thermal) and limiting speed 17,000 r/min (mechanical), catalogue mass 130 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 17,000 r/min while thermal balance under catalogue load sets the 16,000 r/min reference; at dm ≈ 38.5 mm the corresponding dn is approximately 655k mm·r/min. Selection figures for 7205 BECBP: the static-to-dynamic ratio C0/C is 0.64, Pu 0.43 kN is about 3 % of C, and catalogue mass works out to roughly 5 g per millimetre of bore. Bore-to-OD planning: OD 52 over bore 25 is a 2.08× step for this size, and the 15 mm width gives a bore/width ratio of 1.67; use these ratios when housing space around the 25 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "centrifugal and vacuum pumps",
      "industrial transmissions",
      "printing cylinders and packaging shafts"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7205-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7205-BECBP?",
        "a": "7205 BECBP measures 25 mm bore × 52 mm OD × 15 mm width (0.984 × 2.047 × 0.591 in), mass about 130 g. SKF 17000 ratings: C 15.6 kN, C0 10 kN, Pu 0.43 kN, reference speed 16,000 r/min (thermal) and limiting speed 17,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7205-BECBP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7205-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (15.6/10 kN vs 18/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-205-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (15.6/10 kN vs 27/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7205 BEP is the basic 25×52×15 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7205-BECBP",
      "7205 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7205-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7205 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 15.6,
    "static_load_kN": 10,
    "fatigue_load_limit_kN": 0.43,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 17000,
    "max_rpm": 17000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7205 BECBY is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 25×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 25×52×15 mm (0.984×2.047×0.591 in), 13.5 mm radial section height, C 15.6 kN, C0 10 kN, Pu 0.43 kN.reference speed 16,000 r/min (thermal) and limiting speed 17,000 r/min (mechanical), catalogue mass 130 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 17,000 r/min while thermal balance under catalogue load sets the 16,000 r/min reference; at dm ≈ 38.5 mm the corresponding dn is approximately 655k mm·r/min. Sizing arithmetic on the 25 mm bore: 15.6 kN C divided by the 13.5 mm radial section height gives 1.2 kN per section millimetre; the 130 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 52 over bore 25 is a 2.08× step for this size, and the 15 mm width gives a bore/width ratio of 1.67; use these ratios when housing space around the 25 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "At 25 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "At 25 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "At 25 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7205-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7205-BECBY?",
        "a": "7205 BECBY measures 25 mm bore × 52 mm OD × 15 mm width (0.984 × 2.047 × 0.591 in), mass about 130 g. SKF 17000 ratings: C 15.6 kN, C0 10 kN, Pu 0.43 kN, reference speed 16,000 r/min (thermal) and limiting speed 17,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which fits should I use for 7205-BECBY?",
        "a": "With a rotating inner ring use roughly k5 on the 25 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7205-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 17,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7205-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (15.6/10 kN vs 18/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-205-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (15.6/10 kN vs 27/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7205 BEP is the basic 25×52×15 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7205-BECBY",
      "7205 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7205-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7205 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 15.6,
    "static_load_kN": 10,
    "fatigue_load_limit_kN": 0.43,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7205 BECBM is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 25×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 25×52×15 mm (0.984×2.047×0.591 in), 13.5 mm radial section height, C 15.6 kN, C0 10 kN, Pu 0.43 kN.reference speed 16,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical), catalogue mass 130 g. Mass and section check: 130 g inside the 25×52×15 mm outline leaves a 13.5 mm radial section, and the 10 kN static rating is 0.64× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 0.43 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 15.6/10 kN ratings and 130 g mass this execution carries about 0.62 kN of C per millimetre of bore. Bore-to-OD planning: OD 52 over bore 25 is a 2.08× step for this size, and the 15 mm width gives a bore/width ratio of 1.67; use these ratios when housing space around the 25 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps",
      "industrial transmissions"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Fillet radii must clear the chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7205-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7205-BECBM?",
        "a": "7205 BECBM measures 25 mm bore × 52 mm OD × 15 mm width (0.984 × 2.047 × 0.591 in), mass about 130 g. SKF 17000 ratings: C 15.6 kN, C0 10 kN, Pu 0.43 kN, reference speed 16,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7205-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7205-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7205-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (15.6/10 kN vs 18/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-205-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (15.6/10 kN vs 27/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7205 BEP is the basic 25×52×15 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7205-BECBM",
      "7205 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7205-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7205 BECBPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 15.6,
    "static_load_kN": 10,
    "fatigue_load_limit_kN": 0.43,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 17000,
    "max_rpm": 17000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7205 BECBPH is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 25×52×15 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 25×52×15 mm (0.984×2.047×0.591 in), 13.5 mm radial section height, C 15.6 kN, C0 10 kN, Pu 0.43 kN.reference speed 16,000 r/min (thermal) and limiting speed 17,000 r/min (mechanical), catalogue mass 130 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 17,000 r/min while thermal balance under catalogue load sets the 16,000 r/min reference; at dm ≈ 38.5 mm the corresponding dn is approximately 655k mm·r/min. At the printed limiting speed of 17,000 r/min the mean pitch diameter dm ≈ 38.5 mm implies a dn value around 655k mm·r/min; the 16,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 52 over bore 25 is a 2.08× step for this size, and the 15 mm width gives a bore/width ratio of 1.67; use these ratios when housing space around the 25 mm shaft is the first constraint. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7205-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7205-BECBPH?",
        "a": "7205 BECBPH measures 25 mm bore × 52 mm OD × 15 mm width (0.984 × 2.047 × 0.591 in), mass about 130 g. SKF 17000 ratings: C 15.6 kN, C0 10 kN, Pu 0.43 kN, reference speed 16,000 r/min (thermal) and limiting speed 17,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7205-BECBPH?",
        "a": "The 16,000 r/min reference (thermal) and 17,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7205-BECBPH take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7205-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope with catalogue ratings within 10 %; 7205 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7205-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (15.6/10 kN vs 18/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-205-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (15.6/10 kN vs 27/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7205 BEP is the basic 25×52×15 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7205-BECBPH",
      "7205 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7205-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7205 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 18,
    "static_load_kN": 11.4,
    "fatigue_load_limit_kN": 0.49,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 26000,
    "max_rpm": 26000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7205 ACCBM is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 25×52×15 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 25×52×15 mm (0.984×2.047×0.591 in), 13.5 mm radial section height, C 18 kN, C0 11.4 kN, Pu 0.49 kN.reference speed 17,000 r/min (thermal) and limiting speed 26,000 r/min (mechanical), catalogue mass 130 g. Load balance: C0 11.4 kN against C 18 kN gives a 0.63 ratio, typical of a steep-angle axial-oriented design; Pu 0.49 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 25 mm bore: 18 kN C divided by the 13.5 mm radial section height gives 1.3 kN per section millimetre; the 130 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 17,000 r/min against a 26,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.65. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps",
      "industrial transmissions"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "One 7205-ACCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Preload the set against a calculated stand-off dimension — the ground faces of ACCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Do not mix execution classes inside one set: a universally matchable ACCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Fillet radii must clear the chamfer so the 15 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The 25° AC angle of 7205-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7205-ACCBM?",
        "a": "7205 ACCBM measures 25 mm bore × 52 mm OD × 15 mm width (0.984 × 2.047 × 0.591 in), mass about 130 g. SKF 17000 ratings: C 18 kN, C0 11.4 kN, Pu 0.49 kN, reference speed 17,000 r/min (thermal) and limiting speed 26,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7205-ACCBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 26,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7205-ACCBM?",
        "a": "The 17,000 r/min reference (thermal) and 26,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7205-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (18/11.4 kN vs 14.8/9.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (18/11.4 kN vs 14.8/9.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-BEY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (18/11.4 kN vs 14.8/9.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (18/11.4 kN vs 15.6/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (18/11.4 kN vs 15.6/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (18/11.4 kN vs 15.6/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (18/11.4 kN vs 15.6/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-205-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (18/11.4 kN vs 27/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7205 BEP shares the 25×52×15 mm angular-contact envelope, but catalogue C/C0 differ (18/11.4 kN vs 14.8/9.3 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7205-ACCBM",
      "7205 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7305-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7305 BE-2RZP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 24.2,
    "static_load_kN": 14,
    "fatigue_load_limit_kN": 0.6,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7305 BE-2RZP is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 25×62×17 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 25×62×17 mm (0.984×2.441×0.669 in), 18.5 mm radial section height, C 24.2 kN, C0 14 kN, Pu 0.6 kN.reference speed 14,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), catalogue mass 230 g. The 0.6 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 24.2/14 kN ratings and 230 g mass this execution carries about 0.97 kN of C per millimetre of bore. Sizing arithmetic on the 25 mm bore: 24.2 kN C divided by the 18.5 mm radial section height gives 1.3 kN per section millimetre; the 230 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 62 over bore 25 is a 2.48× step for this size, and the 17 mm width gives a bore/width ratio of 1.47; use these ratios when housing space around the 25 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7305-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7305-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7305-BE-2RZP?",
        "a": "7305 BE-2RZP measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 230 g. SKF 17000 ratings: C 24.2 kN, C0 14 kN, Pu 0.6 kN, reference speed 14,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7305-BE-2RZP?",
        "a": "With a rotating inner ring use roughly k5 on the 25 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7305-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7305-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (24.2/14 kN vs 29/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (24.2/14 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (24.2/14 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7305 BEP is the basic 25×62×17 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7305-BE-2RZP",
      "7305 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7305-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7305 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 24.2,
    "static_load_kN": 14,
    "fatigue_load_limit_kN": 0.6,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7305 BEP is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 25×62×17 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 25×62×17 mm (0.984×2.441×0.669 in), 18.5 mm radial section height, C 24.2 kN, C0 14 kN, Pu 0.6 kN.reference speed 14,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical), which coincide for this size, catalogue mass 230 g. The 0.6 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 24.2/14 kN ratings and 230 g mass this execution carries about 0.97 kN of C per millimetre of bore. Sizing arithmetic on the 25 mm bore: 24.2 kN C divided by the 18.5 mm radial section height gives 1.3 kN per section millimetre; the 230 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 62 over bore 25 is a 2.48× step for this size, and the 17 mm width gives a bore/width ratio of 1.47; use these ratios when housing space around the 25 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "At 25 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7305-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7305 BEP as the single basic pa66 execution; the other order numbers of the 7305 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7305-BEP?",
        "a": "7305 BEP measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 230 g. SKF 17000 ratings: C 24.2 kN, C0 14 kN, Pu 0.6 kN, reference speed 14,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Can one 7305-BEP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7305-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7305-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7305-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (24.2/14 kN vs 29/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (24.2/14 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (24.2/14 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7305 BEP is the basic 25×62×17 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7305-BEP",
      "7305 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7305-BEY",
    "brand": "SKF",
    "manufacturer_designation": "7305 BEY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 24.2,
    "static_load_kN": 14,
    "fatigue_load_limit_kN": 0.6,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7305 BEY is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 25×62×17 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. The BEY is a basic single bearing with a stamped brass Y cage — a single unit, not a universally matchable one.. Envelope 25×62×17 mm (0.984×2.441×0.669 in), 18.5 mm radial section height, C 24.2 kN, C0 14 kN, Pu 0.6 kN.reference speed 14,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical), which coincide for this size, catalogue mass 230 g. Sizing arithmetic on the 25 mm bore: 24.2 kN C divided by the 18.5 mm radial section height gives 1.3 kN per section millimetre; the 230 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 14 kN against C 24.2 kN gives a 0.58 ratio, typical of a steep-angle axial-oriented design; Pu 0.6 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 62 over bore 25 is a 2.48× step for this size, and the 17 mm width gives a bore/width ratio of 1.47; use these ratios when housing space around the 25 mm shaft is the first constraint. Ordering note: BEY is the basic single bearing with the stamped brass strip cage (Y) — light and oil-additive tolerant, but not ground on the side faces for set mounting; order BECBY for a universally matchable stamped-brass unit.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "fretting corrosion on a loose rotating shaft seat",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Assign interference to the rotating ring — roughly k5 on a 25 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7305-BEY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7305 BEY as the single basic stamped brass execution; the other order numbers of the 7305 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7305-BEY?",
        "a": "7305 BEY measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 230 g. SKF 17000 ratings: C 24.2 kN, C0 14 kN, Pu 0.6 kN, reference speed 14,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. The BEY is a basic single bearing with a stamped brass Y cage — a single unit, not a universally matchable one.."
      },
      {
        "q": "Which grease and fill for 7305-BEY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 14,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7305-BEY?",
        "a": "The 14,000 r/min reference (thermal) and 14,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7305-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7305-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (24.2/14 kN vs 29/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (24.2/14 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (24.2/14 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7305 BEP is the basic 25×62×17 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7305-BEY",
      "7305 BEY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7305-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7305 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 15.3,
    "fatigue_load_limit_kN": 0.655,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7305 BECBP is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 25×62×17 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 25×62×17 mm (0.984×2.441×0.669 in), 18.5 mm radial section height, C 26.5 kN, C0 15.3 kN, Pu 0.655 kN.reference speed 14,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical), catalogue mass 230 g. Mass and section check: 230 g inside the 25×62×17 mm outline leaves a 18.5 mm radial section, and the 15.3 kN static rating is 0.58× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 0.655 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 26.5/15.3 kN ratings and 230 g mass this execution carries about 1.06 kN of C per millimetre of bore. Bore-to-OD planning: OD 62 over bore 25 is a 2.48× step for this size, and the 17 mm width gives a bore/width ratio of 1.47; use these ratios when housing space around the 25 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps",
      "industrial transmissions"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Fillet radii must clear the chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring — roughly k5 on a 25 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7305-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7305-BECBP?",
        "a": "7305 BECBP measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 230 g. SKF 17000 ratings: C 26.5 kN, C0 15.3 kN, Pu 0.655 kN, reference speed 14,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7305-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 15,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7305-BECBP?",
        "a": "The 14,000 r/min reference (thermal) and 15,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7305-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7305-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (26.5/15.3 kN vs 29/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (26.5/15.3 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (26.5/15.3 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7305 BEP is the basic 25×62×17 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7305-BECBP",
      "7305 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7305-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7305 BECBPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 15.3,
    "fatigue_load_limit_kN": 0.655,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7305 BECBPH is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 25×62×17 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 25×62×17 mm (0.984×2.441×0.669 in), 18.5 mm radial section height, C 26.5 kN, C0 15.3 kN, Pu 0.655 kN.reference speed 14,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical), catalogue mass 230 g. The 0.655 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 26.5/15.3 kN ratings and 230 g mass this execution carries about 1.06 kN of C per millimetre of bore. Selection figures for 7305 BECBPH: the static-to-dynamic ratio C0/C is 0.58, Pu 0.655 kN is about 2 % of C, and catalogue mass works out to roughly 9 g per millimetre of bore. Bore-to-OD planning: OD 62 over bore 25 is a 2.48× step for this size, and the 17 mm width gives a bore/width ratio of 1.47; use these ratios when housing space around the 25 mm shaft is the first constraint. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps",
      "industrial transmissions"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "raceway staining from water in the lubricant during idle periods",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7305-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7305-BECBPH?",
        "a": "7305 BECBPH measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 230 g. SKF 17000 ratings: C 26.5 kN, C0 15.3 kN, Pu 0.655 kN, reference speed 14,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7305-BECBPH?",
        "a": "With a rotating inner ring use roughly k5 on the 25 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7305-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7305-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (26.5/15.3 kN vs 29/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (26.5/15.3 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (26.5/15.3 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7305 BEP is the basic 25×62×17 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7305-BECBPH",
      "7305 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7305-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7305 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 15.3,
    "fatigue_load_limit_kN": 0.655,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7305 BECBY is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 25×62×17 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 25×62×17 mm (0.984×2.441×0.669 in), 18.5 mm radial section height, C 26.5 kN, C0 15.3 kN, Pu 0.655 kN.reference speed 14,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical), catalogue mass 230 g. Sizing arithmetic on the 25 mm bore: 26.5 kN C divided by the 18.5 mm radial section height gives 1.4 kN per section millimetre; the 230 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. The 0.655 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 26.5/15.3 kN ratings and 230 g mass this execution carries about 1.06 kN of C per millimetre of bore. Bore-to-OD planning: OD 62 over bore 25 is a 2.48× step for this size, and the 17 mm width gives a bore/width ratio of 1.47; use these ratios when housing space around the 25 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps",
      "industrial transmissions"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "At 25 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Do not mix execution classes inside one set: a universally matchable BECBY unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7305-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7305-BECBY?",
        "a": "7305 BECBY measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 230 g. SKF 17000 ratings: C 26.5 kN, C0 15.3 kN, Pu 0.655 kN, reference speed 14,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Can one 7305-BECBY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7305-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7305-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7305-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (26.5/15.3 kN vs 29/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (26.5/15.3 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (26.5/15.3 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7305 BEP is the basic 25×62×17 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7305-BECBY",
      "7305 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7305-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7305 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 15.3,
    "fatigue_load_limit_kN": 0.655,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 19000,
    "max_rpm": 19000,
    "weight_g": 230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7305 BECBM is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 25×62×17 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 25×62×17 mm (0.984×2.441×0.669 in), 18.5 mm radial section height, C 26.5 kN, C0 15.3 kN, Pu 0.655 kN.reference speed 14,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical), catalogue mass 230 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 19,000 r/min while thermal balance under catalogue load sets the 14,000 r/min reference; at dm ≈ 43.5 mm the corresponding dn is approximately 827k mm·r/min. Selection figures for 7305 BECBM: the static-to-dynamic ratio C0/C is 0.58, Pu 0.655 kN is about 2 % of C, and catalogue mass works out to roughly 9 g per millimetre of bore. Bore-to-OD planning: OD 62 over bore 25 is a 2.48× step for this size, and the 17 mm width gives a bore/width ratio of 1.47; use these ratios when housing space around the 25 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "centrifugal and vacuum pumps",
      "industrial transmissions",
      "printing cylinders and packaging shafts"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "One 7305-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Fillet radii must clear the chamfer so the 17 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring — roughly k5 on a 25 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7305-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7305-BECBM?",
        "a": "7305 BECBM measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 230 g. SKF 17000 ratings: C 26.5 kN, C0 15.3 kN, Pu 0.655 kN, reference speed 14,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7305-BECBM?",
        "a": "The 14,000 r/min reference (thermal) and 19,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7305-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7305-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7305-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; 7305 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (26.5/15.3 kN vs 29/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (26.5/15.3 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (26.5/15.3 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7305 BEP is the basic 25×62×17 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7305-BECBM",
      "7305 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7305-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7305 ACCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 29,
    "static_load_kN": 17,
    "fatigue_load_limit_kN": 0.72,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 22000,
    "max_rpm": 22000,
    "weight_g": 230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7305 ACCBM is SKF's 25 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 25° (AC) contact angle, 25×62×17 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 25×62×17 mm (0.984×2.441×0.669 in), 18.5 mm radial section height, C 29 kN, C0 17 kN, Pu 0.72 kN.reference speed 15,000 r/min (thermal) and limiting speed 22,000 r/min (mechanical), catalogue mass 230 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 22,000 r/min while thermal balance under catalogue load sets the 15,000 r/min reference; at dm ≈ 43.5 mm the corresponding dn is approximately 957k mm·r/min. Selection figures for 7305 ACCBM: the static-to-dynamic ratio C0/C is 0.59, Pu 0.72 kN is about 2 % of C, and catalogue mass works out to roughly 9 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 15,000 r/min against a 22,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.68. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "One 7305-ACCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The 25° AC angle of 7305-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7305-ACCBM?",
        "a": "7305 ACCBM measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 230 g. SKF 17000 ratings: C 29 kN, C0 17 kN, Pu 0.72 kN, reference speed 15,000 r/min (thermal) and limiting speed 22,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7305-ACCBM?",
        "a": "The 15,000 r/min reference (thermal) and 22,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7305-ACCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 25° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7305-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7305-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (29/17 kN vs 24.2/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (29/17 kN vs 24.2/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BEY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (29/17 kN vs 24.2/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (29/17 kN vs 26.5/15.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (29/17 kN vs 26.5/15.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (29/17 kN vs 26.5/15.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (29/17 kN vs 26.5/15.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (29/17 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (29/17 kN vs 42.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7305 BEP shares the 25×62×17 mm angular-contact envelope, but catalogue C/C0 differ (29/17 kN vs 24.2/14 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7305-ACCBM",
      "7305 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7206-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7206 BE-2RZP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.5,
    "static_load_kN": 14.3,
    "fatigue_load_limit_kN": 0.61,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7206 BE-2RZP is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 30×62×16 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 30×62×16 mm (1.181×2.441×0.63 in), 16.0 mm radial section height, C 22.5 kN, C0 14.3 kN, Pu 0.61 kN.reference speed 13,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 260 g. Load balance: C0 14.3 kN against C 22.5 kN gives a 0.64 ratio, typical of a steep-angle axial-oriented design; Pu 0.61 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 260 g inside the 30×62×16 mm outline leaves a 16.0 mm radial section, and the 14.3 kN static rating is 0.64× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 13,000 r/min against a 10,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.30. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "One 7206-BE-2RZP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7206-BE-2RZP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7206-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7206-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7206-BE-2RZP?",
        "a": "7206 BE-2RZP measures 30 mm bore × 62 mm OD × 16 mm width (1.181 × 2.441 × 0.63 in), mass about 260 g. SKF 17000 ratings: C 22.5 kN, C0 14.3 kN, Pu 0.61 kN, reference speed 13,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "Which grease and fill for 7206-BE-2RZP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 10,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7206-BE-2RZP?",
        "a": "The 13,000 r/min reference (thermal) and 10,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7206-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "7206-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (22.5/14.3 kN vs 25.5/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (22.5/14.3 kN vs 27.5/17.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (22.5/14.3 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (22.5/14.3 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7206 BEP is the basic 30×62×16 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7206-BE-2RZP",
      "7206 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7206-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7206 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 22.5,
    "static_load_kN": 14.3,
    "fatigue_load_limit_kN": 0.61,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7206 BEP is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 30×62×16 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 30×62×16 mm (1.181×2.441×0.63 in), 16.0 mm radial section height, C 22.5 kN, C0 14.3 kN, Pu 0.61 kN.reference speed 13,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical), which coincide for this size, catalogue mass 200 g. Load balance: C0 14.3 kN against C 22.5 kN gives a 0.64 ratio, typical of a steep-angle axial-oriented design; Pu 0.61 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 200 g inside the 30×62×16 mm outline leaves a 16.0 mm radial section, and the 14.3 kN static rating is 0.64× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 13,000 r/min against a 13,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "One 7206-BEP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7206-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7206 BEP as the single basic pa66 execution; the other order numbers of the 7206 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7206-BEP?",
        "a": "7206 BEP measures 30 mm bore × 62 mm OD × 16 mm width (1.181 × 2.441 × 0.63 in), mass about 200 g. SKF 17000 ratings: C 22.5 kN, C0 14.3 kN, Pu 0.61 kN, reference speed 13,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7206-BEP?",
        "a": "With a rotating inner ring use roughly k5 on the 30 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7206-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7206-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (22.5/14.3 kN vs 25.5/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (22.5/14.3 kN vs 27.5/17.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (22.5/14.3 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (22.5/14.3 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7206 BEP is the basic 30×62×16 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7206-BEP",
      "7206 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7206-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7206 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 24,
    "static_load_kN": 15.6,
    "fatigue_load_limit_kN": 0.655,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7206 BECBP is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 30×62×16 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 30×62×16 mm (1.181×2.441×0.63 in), 16.0 mm radial section height, C 24 kN, C0 15.6 kN, Pu 0.655 kN.reference speed 13,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical), catalogue mass 200 g. The 0.655 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 24/15.6 kN ratings and 200 g mass this execution carries about 0.80 kN of C per millimetre of bore. Load balance: C0 15.6 kN against C 24 kN gives a 0.65 ratio, typical of a steep-angle axial-oriented design; Pu 0.655 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 13,000 r/min against a 14,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.93. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "raceway staining from water in the lubricant during idle periods",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "One 7206-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7206-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7206-BECBP?",
        "a": "7206 BECBP measures 30 mm bore × 62 mm OD × 16 mm width (1.181 × 2.441 × 0.63 in), mass about 200 g. SKF 17000 ratings: C 24 kN, C0 15.6 kN, Pu 0.655 kN, reference speed 13,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7206-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 14,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7206-BECBP?",
        "a": "The 13,000 r/min reference (thermal) and 14,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7206-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7206-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (24/15.6 kN vs 27.5/17.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (24/15.6 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (24/15.6 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7206 BEP is the basic 30×62×16 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7206-BECBP",
      "7206 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7206-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7206 BECBPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 24,
    "static_load_kN": 15.6,
    "fatigue_load_limit_kN": 0.655,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7206 BECBPH is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 30×62×16 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 30×62×16 mm (1.181×2.441×0.63 in), 16.0 mm radial section height, C 24 kN, C0 15.6 kN, Pu 0.655 kN.reference speed 13,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical), catalogue mass 200 g. Load balance: C0 15.6 kN against C 24 kN gives a 0.65 ratio, typical of a steep-angle axial-oriented design; Pu 0.655 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 14,000 r/min while thermal balance under catalogue load sets the 13,000 r/min reference; at dm ≈ 46.0 mm the corresponding dn is approximately 644k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 13,000 r/min against a 14,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.93. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "One 7206-BECBPH locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7206-BECBPH of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Do not mix execution classes inside one set: a universally matchable BECBPH unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7206-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7206-BECBPH?",
        "a": "7206 BECBPH measures 30 mm bore × 62 mm OD × 16 mm width (1.181 × 2.441 × 0.63 in), mass about 200 g. SKF 17000 ratings: C 24 kN, C0 15.6 kN, Pu 0.655 kN, reference speed 13,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7206-BECBPH?",
        "a": "With a rotating inner ring use roughly k5 on the 30 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7206-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7206-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (24/15.6 kN vs 27.5/17.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (24/15.6 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (24/15.6 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7206 BEP is the basic 30×62×16 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7206-BECBPH",
      "7206 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7206-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7206 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 24,
    "static_load_kN": 15.6,
    "fatigue_load_limit_kN": 0.655,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7206 BECBM is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 30×62×16 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 30×62×16 mm (1.181×2.441×0.63 in), 16.0 mm radial section height, C 24 kN, C0 15.6 kN, Pu 0.655 kN.reference speed 13,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical), catalogue mass 200 g. Envelope economics: the 16 mm width over a 16.0 mm section yields 1.00 mm of ring width per section millimetre, and the bearing weighs 200 g for 24 kN of dynamic capacity — about 8 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 18,000 r/min while thermal balance under catalogue load sets the 13,000 r/min reference; at dm ≈ 46.0 mm the corresponding dn is approximately 828k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 13,000 r/min against a 18,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.72. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 30 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7206-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7206-BECBM?",
        "a": "7206 BECBM measures 30 mm bore × 62 mm OD × 16 mm width (1.181 × 2.441 × 0.63 in), mass about 200 g. SKF 17000 ratings: C 24 kN, C0 15.6 kN, Pu 0.655 kN, reference speed 13,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7206-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7206-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7206-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (24/15.6 kN vs 27.5/17.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (24/15.6 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (24/15.6 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7206 BEP is the basic 30×62×16 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7206-BECBM",
      "7206 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7206-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7206 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 25.5,
    "static_load_kN": 17,
    "fatigue_load_limit_kN": 0.71,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7206 BECBY is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 30×62×16 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 30×62×16 mm (1.181×2.441×0.63 in), 16.0 mm radial section height, C 25.5 kN, C0 17 kN, Pu 0.71 kN.reference speed 13,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical), catalogue mass 200 g. Mass and section check: 200 g inside the 30×62×16 mm outline leaves a 16.0 mm radial section, and the 17 kN static rating is 0.67× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 17 kN against C 25.5 kN gives a 0.67 ratio, typical of a steep-angle axial-oriented design; Pu 0.71 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 13,000 r/min against a 14,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.93. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7206-BECBY of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Do not mix execution classes inside one set: a universally matchable BECBY unit is ground for arbitrary pairing, a basic execution is not.",
      "At 30 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Assign interference to the rotating ring — roughly k5 on a 30 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7206-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7206-BECBY?",
        "a": "7206 BECBY measures 30 mm bore × 62 mm OD × 16 mm width (1.181 × 2.441 × 0.63 in), mass about 200 g. SKF 17000 ratings: C 25.5 kN, C0 17 kN, Pu 0.71 kN, reference speed 13,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which grease and fill for 7206-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 14,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7206-BECBY?",
        "a": "The 13,000 r/min reference (thermal) and 14,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7206-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7206-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (25.5/17 kN vs 22.5/14.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (25.5/17 kN vs 22.5/14.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206-ACCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 ACCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-206-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (25.5/17 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (25.5/17 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7206 BEP shares the 30×62×16 mm angular-contact envelope, but catalogue C/C0 differ (25.5/17 kN vs 22.5/14.3 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7206-BECBY",
      "7206 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7206-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7206 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 27.5,
    "static_load_kN": 17.3,
    "fatigue_load_limit_kN": 0.735,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7206 ACCBM is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 30×62×16 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 30×62×16 mm (1.181×2.441×0.63 in), 16.0 mm radial section height, C 27.5 kN, C0 17.3 kN, Pu 0.735 kN.reference speed 15,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical), catalogue mass 200 g. Selection figures for 7206 ACCBM: the static-to-dynamic ratio C0/C is 0.63, Pu 0.735 kN is about 3 % of C, and catalogue mass works out to roughly 7 g per millimetre of bore. At the printed limiting speed of 20,000 r/min the mean pitch diameter dm ≈ 46.0 mm implies a dn value around 920k mm·r/min; the 15,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 62 over bore 30 is a 2.07× step for this size, and the 16 mm width gives a bore/width ratio of 1.88; use these ratios when housing space around the 30 mm shaft is the first constraint. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7206-ACCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Preload the set against a calculated stand-off dimension — the ground faces of ACCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 0,55 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The 25° AC angle of 7206-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7206-ACCBM?",
        "a": "7206 ACCBM measures 30 mm bore × 62 mm OD × 16 mm width (1.181 × 2.441 × 0.63 in), mass about 200 g. SKF 17000 ratings: C 27.5 kN, C0 17.3 kN, Pu 0.735 kN, reference speed 15,000 r/min (thermal) and limiting speed 20,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7206-ACCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7206-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7206-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (27.5/17.3 kN vs 22.5/14.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (27.5/17.3 kN vs 22.5/14.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (27.5/17.3 kN vs 24/15.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (27.5/17.3 kN vs 24/15.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (27.5/17.3 kN vs 24/15.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; 7206 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-206-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (27.5/17.3 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (27.5/17.3 kN vs 37.5/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7206 BEP shares the 30×62×16 mm angular-contact envelope, but catalogue C/C0 differ (27.5/17.3 kN vs 22.5/14.3 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7206-ACCBM",
      "7206 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7306-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7306 BE-2RZP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 19.3,
    "fatigue_load_limit_kN": 0.815,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 9500,
    "max_rpm": 9500,
    "weight_g": 350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7306 BE-2RZP is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 30×72×19 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 30×72×19 mm (1.181×2.835×0.748 in), 21.0 mm radial section height, C 32.5 kN, C0 19.3 kN, Pu 0.815 kN.reference speed 12,000 r/min (thermal) and limiting speed 9,500 r/min (mechanical), catalogue mass 350 g. Selection figures for 7306 BE-2RZP: the static-to-dynamic ratio C0/C is 0.59, Pu 0.815 kN is about 3 % of C, and catalogue mass works out to roughly 12 g per millimetre of bore. Load balance: C0 19.3 kN against C 32.5 kN gives a 0.59 ratio, typical of a steep-angle axial-oriented design; Pu 0.815 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 12,000 r/min against a 9,500 r/min limiting speed, i.e. a reference-to-limit ratio of 1.26. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "brinelling from pressing the ring home through the balls or from static overload",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "One 7306-BE-2RZP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "At 30 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Fillet radii must clear the chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7306-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7306-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7306-BE-2RZP?",
        "a": "7306 BE-2RZP measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 350 g. SKF 17000 ratings: C 32.5 kN, C0 19.3 kN, Pu 0.815 kN, reference speed 12,000 r/min (thermal) and limiting speed 9,500 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "Which fits should I use for 7306-BE-2RZP?",
        "a": "With a rotating inner ring use roughly k5 on the 30 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7306-BE-2RZP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 9,500 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7306-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7306-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (32.5/19.3 kN vs 37.5/23.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (32.5/19.3 kN vs 39/23.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (32.5/19.3 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (32.5/19.3 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (32.5/19.3 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7306 BEP is the basic 30×72×19 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7306-BE-2RZP",
      "7306 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7306-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7306 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 19.3,
    "fatigue_load_limit_kN": 0.815,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7306 BEP is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 30×72×19 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 30×72×19 mm (1.181×2.835×0.748 in), 21.0 mm radial section height, C 32.5 kN, C0 19.3 kN, Pu 0.815 kN.reference speed 12,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical), which coincide for this size, catalogue mass 340 g. Selection figures for 7306 BEP: the static-to-dynamic ratio C0/C is 0.59, Pu 0.815 kN is about 3 % of C, and catalogue mass works out to roughly 11 g per millimetre of bore. Load balance: C0 19.3 kN against C 32.5 kN gives a 0.59 ratio, typical of a steep-angle axial-oriented design; Pu 0.815 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 12,000 r/min against a 12,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "brinelling from pressing the ring home through the balls or from static overload",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Assign interference to the rotating ring — roughly k5 on a 30 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7306-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7306 BEP as the single basic pa66 execution; the other order numbers of the 7306 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7306-BEP?",
        "a": "7306 BEP measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 340 g. SKF 17000 ratings: C 32.5 kN, C0 19.3 kN, Pu 0.815 kN, reference speed 12,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which fits should I use for 7306-BEP?",
        "a": "With a rotating inner ring use roughly k5 on the 30 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7306-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 12,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7306-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7306-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (32.5/19.3 kN vs 37.5/23.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (32.5/19.3 kN vs 39/23.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (32.5/19.3 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (32.5/19.3 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (32.5/19.3 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7306 BEP is the basic 30×72×19 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7306-BEP",
      "7306 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7306-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7306 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 35.5,
    "static_load_kN": 21.2,
    "fatigue_load_limit_kN": 0.9,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7306 BECBP is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 30×72×19 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 30×72×19 mm (1.181×2.835×0.748 in), 21.0 mm radial section height, C 35.5 kN, C0 21.2 kN, Pu 0.9 kN.reference speed 12,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical), catalogue mass 340 g. Envelope economics: the 19 mm width over a 21.0 mm section yields 0.90 mm of ring width per section millimetre, and the bearing weighs 340 g for 35.5 kN of dynamic capacity — about 10 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 13,000 r/min while thermal balance under catalogue load sets the 12,000 r/min reference; at dm ≈ 51.0 mm the corresponding dn is approximately 663k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 12,000 r/min against a 13,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.92. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "At 30 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7306-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7306-BECBP?",
        "a": "7306 BECBP measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 340 g. SKF 17000 ratings: C 35.5 kN, C0 21.2 kN, Pu 0.9 kN, reference speed 12,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7306-BECBP?",
        "a": "With a rotating inner ring use roughly k5 on the 30 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7306-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 13,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7306-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7306-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (35.5/21.2 kN vs 39/23.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (35.5/21.2 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (35.5/21.2 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (35.5/21.2 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7306 BEP is the basic 30×72×19 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7306-BECBP",
      "7306 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7306-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7306 BEGAPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 35.5,
    "static_load_kN": 21.2,
    "fatigue_load_limit_kN": 0.9,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7306 BEGAPH is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 30×72×19 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 30×72×19 mm (1.181×2.835×0.748 in), 21.0 mm radial section height, C 35.5 kN, C0 21.2 kN, Pu 0.9 kN.reference speed 12,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical), catalogue mass 340 g. Envelope economics: the 19 mm width over a 21.0 mm section yields 0.90 mm of ring width per section millimetre, and the bearing weighs 340 g for 35.5 kN of dynamic capacity — about 10 g per rated kN. Selection figures for 7306 BEGAPH: the static-to-dynamic ratio C0/C is 0.60, Pu 0.9 kN is about 3 % of C, and catalogue mass works out to roughly 11 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 12,000 r/min against a 13,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.92. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BEGAPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "At 30 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7306-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7306-BEGAPH?",
        "a": "7306 BEGAPH measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 340 g. SKF 17000 ratings: C 35.5 kN, C0 21.2 kN, Pu 0.9 kN, reference speed 12,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "What minimum axial load does 7306-BEGAPH need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7306-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7306-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (35.5/21.2 kN vs 39/23.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (35.5/21.2 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (35.5/21.2 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (35.5/21.2 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7306 BEP is the basic 30×72×19 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7306-BEGAPH",
      "7306 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7306-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7306 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 35.5,
    "static_load_kN": 21.2,
    "fatigue_load_limit_kN": 0.9,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 16000,
    "max_rpm": 16000,
    "weight_g": 340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7306 BECBM is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 30×72×19 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 30×72×19 mm (1.181×2.835×0.748 in), 21.0 mm radial section height, C 35.5 kN, C0 21.2 kN, Pu 0.9 kN.reference speed 12,000 r/min (thermal) and limiting speed 16,000 r/min (mechanical), catalogue mass 340 g. The 0.9 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 35.5/21.2 kN ratings and 340 g mass this execution carries about 1.18 kN of C per millimetre of bore. Load balance: C0 21.2 kN against C 35.5 kN gives a 0.60 ratio, typical of a steep-angle axial-oriented design; Pu 0.9 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 12,000 r/min against a 16,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.75. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "raceway staining from water in the lubricant during idle periods",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7306-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7306-BECBM?",
        "a": "7306 BECBM measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 340 g. SKF 17000 ratings: C 35.5 kN, C0 21.2 kN, Pu 0.9 kN, reference speed 12,000 r/min (thermal) and limiting speed 16,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7306-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7306-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7306-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7306-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (35.5/21.2 kN vs 39/23.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (35.5/21.2 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (35.5/21.2 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (35.5/21.2 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7306 BEP is the basic 30×72×19 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7306-BECBM",
      "7306 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7306-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7306 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 37.5,
    "static_load_kN": 23.2,
    "fatigue_load_limit_kN": 0.98,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7306 BECBY is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 30×72×19 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 30×72×19 mm (1.181×2.835×0.748 in), 21.0 mm radial section height, C 37.5 kN, C0 23.2 kN, Pu 0.98 kN.reference speed 12,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical), catalogue mass 340 g. Envelope economics: the 19 mm width over a 21.0 mm section yields 0.90 mm of ring width per section millimetre, and the bearing weighs 340 g for 37.5 kN of dynamic capacity — about 9 g per rated kN. Mass and section check: 340 g inside the 30×72×19 mm outline leaves a 21.0 mm radial section, and the 23.2 kN static rating is 0.62× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 12,000 r/min against a 13,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.92. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "centrifugal and vacuum pumps",
      "industrial transmissions",
      "printing cylinders and packaging shafts"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7306-BECBY of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Assign interference to the rotating ring — roughly k5 on a 30 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "One 7306-BECBY locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7306-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7306-BECBY?",
        "a": "7306 BECBY measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 340 g. SKF 17000 ratings: C 37.5 kN, C0 23.2 kN, Pu 0.98 kN, reference speed 12,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which fits should I use for 7306-BECBY?",
        "a": "With a rotating inner ring use roughly k5 on the 30 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7306-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 13,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7306-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7306-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (37.5/23.2 kN vs 32.5/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (37.5/23.2 kN vs 32.5/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306-ACCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 ACCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-306-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (37.5/23.2 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (37.5/23.2 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (37.5/23.2 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7306 BEP shares the 30×72×19 mm angular-contact envelope, but catalogue C/C0 differ (37.5/23.2 kN vs 32.5/19.3 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7306-BECBY",
      "7306 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7306-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7306 ACCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 39,
    "static_load_kN": 23.6,
    "fatigue_load_limit_kN": 1,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 19000,
    "max_rpm": 19000,
    "weight_g": 340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7306 ACCBM is SKF's 30 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 25° (AC) contact angle, 30×72×19 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 30×72×19 mm (1.181×2.835×0.748 in), 21.0 mm radial section height, C 39 kN, C0 23.6 kN, Pu 1 kN.reference speed 13,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical), catalogue mass 340 g. The 1 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 39/23.6 kN ratings and 340 g mass this execution carries about 1.30 kN of C per millimetre of bore. Load balance: C0 23.6 kN against C 39 kN gives a 0.61 ratio, typical of a steep-angle axial-oriented design; Pu 1 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 72 over bore 30 is a 2.40× step for this size, and the 19 mm width gives a bore/width ratio of 1.58; use these ratios when housing space around the 30 mm shaft is the first constraint. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7306-ACCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Preload the set against a calculated stand-off dimension — the ground faces of ACCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Do not mix execution classes inside one set: a universally matchable ACCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The 25° AC angle of 7306-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7306-ACCBM?",
        "a": "7306 ACCBM measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 340 g. SKF 17000 ratings: C 39 kN, C0 23.6 kN, Pu 1 kN, reference speed 13,000 r/min (thermal) and limiting speed 19,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7306-ACCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 25° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7306-ACCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7306-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7306-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (39/23.6 kN vs 32.5/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (39/23.6 kN vs 32.5/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (39/23.6 kN vs 35.5/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (39/23.6 kN vs 35.5/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (39/23.6 kN vs 35.5/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; 7306 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-306-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (39/23.6 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (39/23.6 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (39/23.6 kN vs 53/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7306 BEP shares the 30×72×19 mm angular-contact envelope, but catalogue C/C0 differ (39/23.6 kN vs 32.5/19.3 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7306-ACCBM",
      "7306 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7207-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7207 BE-2RZP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 29.1,
    "static_load_kN": 19,
    "fatigue_load_limit_kN": 0.815,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7207 BE-2RZP is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 35×72×17 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 35×72×17 mm (1.378×2.835×0.669 in), 18.5 mm radial section height, C 29.1 kN, C0 19 kN, Pu 0.815 kN.reference speed 11,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), catalogue mass 350 g. Selection figures for 7207 BE-2RZP: the static-to-dynamic ratio C0/C is 0.65, Pu 0.815 kN is about 3 % of C, and catalogue mass works out to roughly 10 g per millimetre of bore. Load balance: C0 19 kN against C 29.1 kN gives a 0.65 ratio, typical of a steep-angle axial-oriented design; Pu 0.815 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 9,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.22. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "brinelling from pressing the ring home through the balls or from static overload",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "At 35 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7207-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7207-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7207-BE-2RZP?",
        "a": "7207 BE-2RZP measures 35 mm bore × 72 mm OD × 17 mm width (1.378 × 2.835 × 0.669 in), mass about 350 g. SKF 17000 ratings: C 29.1 kN, C0 19 kN, Pu 0.815 kN, reference speed 11,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "What minimum axial load does 7207-BE-2RZP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7207-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7207-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (29.1/19 kN vs 32.5/22.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (29.1/19 kN vs 35.5/23.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-207-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (29.1/19 kN vs 49/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7207 BEP is the basic 35×72×17 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7207-BE-2RZP",
      "7207 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7207-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7207 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 29.1,
    "static_load_kN": 19,
    "fatigue_load_limit_kN": 0.815,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7207 BEP is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 35×72×17 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 35×72×17 mm (1.378×2.835×0.669 in), 18.5 mm radial section height, C 29.1 kN, C0 19 kN, Pu 0.815 kN.reference speed 11,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), which coincide for this size, catalogue mass 280 g. Selection figures for 7207 BEP: the static-to-dynamic ratio C0/C is 0.65, Pu 0.815 kN is about 3 % of C, and catalogue mass works out to roughly 8 g per millimetre of bore. Load balance: C0 19 kN against C 29.1 kN gives a 0.65 ratio, typical of a steep-angle axial-oriented design; Pu 0.815 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 11,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "brinelling from pressing the ring home through the balls or from static overload",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7207-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7207 BEP as the single basic pa66 execution; the other order numbers of the 7207 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7207-BEP?",
        "a": "7207 BEP measures 35 mm bore × 72 mm OD × 17 mm width (1.378 × 2.835 × 0.669 in), mass about 280 g. SKF 17000 ratings: C 29.1 kN, C0 19 kN, Pu 0.815 kN, reference speed 11,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What minimum axial load does 7207-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7207-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7207-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (29.1/19 kN vs 32.5/22.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (29.1/19 kN vs 35.5/23.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-207-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (29.1/19 kN vs 49/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7207 BEP is the basic 35×72×17 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7207-BEP",
      "7207 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7207-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7207 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 31,
    "static_load_kN": 20.8,
    "fatigue_load_limit_kN": 0.88,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7207 BECBP is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 35×72×17 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 35×72×17 mm (1.378×2.835×0.669 in), 18.5 mm radial section height, C 31 kN, C0 20.8 kN, Pu 0.88 kN.reference speed 11,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical), catalogue mass 280 g. Envelope economics: the 17 mm width over a 18.5 mm section yields 0.92 mm of ring width per section millimetre, and the bearing weighs 280 g for 31 kN of dynamic capacity — about 9 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 12,000 r/min while thermal balance under catalogue load sets the 11,000 r/min reference; at dm ≈ 53.5 mm the corresponding dn is approximately 642k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 12,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.92. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BECBP unit is ground for arbitrary pairing, a basic execution is not.",
      "One 7207-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7207-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7207-BECBP?",
        "a": "7207 BECBP measures 35 mm bore × 72 mm OD × 17 mm width (1.378 × 2.835 × 0.669 in), mass about 280 g. SKF 17000 ratings: C 31 kN, C0 20.8 kN, Pu 0.88 kN, reference speed 11,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7207-BECBP?",
        "a": "The 11,000 r/min reference (thermal) and 12,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7207-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7207-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7207-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (31/20.8 kN vs 35.5/23.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-207-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (31/20.8 kN vs 49/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7207 BEP is the basic 35×72×17 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7207-BECBP",
      "7207 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7207-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7207 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 31,
    "static_load_kN": 20.8,
    "fatigue_load_limit_kN": 0.88,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7207 BECBM is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 35×72×17 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 35×72×17 mm (1.378×2.835×0.669 in), 18.5 mm radial section height, C 31 kN, C0 20.8 kN, Pu 0.88 kN.reference speed 11,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical), catalogue mass 280 g. The 0.88 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 31/20.8 kN ratings and 280 g mass this execution carries about 0.89 kN of C per millimetre of bore. Load balance: C0 20.8 kN against C 31 kN gives a 0.67 ratio, typical of a steep-angle axial-oriented design; Pu 0.88 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 15,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.73. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "raceway staining from water in the lubricant during idle periods",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7207-BECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7207-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7207-BECBM?",
        "a": "7207 BECBM measures 35 mm bore × 72 mm OD × 17 mm width (1.378 × 2.835 × 0.669 in), mass about 280 g. SKF 17000 ratings: C 31 kN, C0 20.8 kN, Pu 0.88 kN, reference speed 11,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7207-BECBM?",
        "a": "With a rotating inner ring use roughly k5 on the 35 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7207-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7207-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (31/20.8 kN vs 35.5/23.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-207-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (31/20.8 kN vs 49/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7207 BEP is the basic 35×72×17 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7207-BECBM",
      "7207 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7207-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7207 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 22.4,
    "fatigue_load_limit_kN": 0.95,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7207 BECBY is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 35×72×17 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 35×72×17 mm (1.378×2.835×0.669 in), 18.5 mm radial section height, C 32.5 kN, C0 22.4 kN, Pu 0.95 kN.reference speed 11,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical), catalogue mass 280 g. Envelope economics: the 17 mm width over a 18.5 mm section yields 0.92 mm of ring width per section millimetre, and the bearing weighs 280 g for 32.5 kN of dynamic capacity — about 9 g per rated kN. Mass and section check: 280 g inside the 35×72×17 mm outline leaves a 18.5 mm radial section, and the 22.4 kN static rating is 0.69× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 12,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.92. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "centrifugal and vacuum pumps",
      "industrial transmissions",
      "printing cylinders and packaging shafts"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7207-BECBY of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7207-BECBY of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7207-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7207-BECBY?",
        "a": "7207 BECBY measures 35 mm bore × 72 mm OD × 17 mm width (1.378 × 2.835 × 0.669 in), mass about 280 g. SKF 17000 ratings: C 32.5 kN, C0 22.4 kN, Pu 0.95 kN, reference speed 11,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What minimum axial load does 7207-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7207-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7207-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (32.5/22.4 kN vs 29.1/19 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (32.5/22.4 kN vs 29.1/19 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7207-ACCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 ACCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-207-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (32.5/22.4 kN vs 49/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7207 BEP shares the 35×72×17 mm angular-contact envelope, but catalogue C/C0 differ (32.5/22.4 kN vs 29.1/19 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7207-BECBY",
      "7207 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7207-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7207 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 35.5,
    "static_load_kN": 23.2,
    "fatigue_load_limit_kN": 0.98,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7207 ACCBM is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 35×72×17 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 35×72×17 mm (1.378×2.835×0.669 in), 18.5 mm radial section height, C 35.5 kN, C0 23.2 kN, Pu 0.98 kN.reference speed 12,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical), catalogue mass 280 g. The 0.98 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 35.5/23.2 kN ratings and 280 g mass this execution carries about 1.01 kN of C per millimetre of bore. Load balance: C0 23.2 kN against C 35.5 kN gives a 0.65 ratio, typical of a steep-angle axial-oriented design; Pu 0.98 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 72 over bore 35 is a 2.06× step for this size, and the 17 mm width gives a bore/width ratio of 2.06; use these ratios when housing space around the 35 mm shaft is the first constraint. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7207-ACCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Preload the set against a calculated stand-off dimension — the ground faces of ACCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Assign interference to the rotating ring — roughly k5 on a 35 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The 25° AC angle of 7207-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7207-ACCBM?",
        "a": "7207 ACCBM measures 35 mm bore × 72 mm OD × 17 mm width (1.378 × 2.835 × 0.669 in), mass about 280 g. SKF 17000 ratings: C 35.5 kN, C0 23.2 kN, Pu 0.98 kN, reference speed 12,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7207-ACCBM?",
        "a": "With a rotating inner ring use roughly k5 on the 35 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7207-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7207-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (35.5/23.2 kN vs 29.1/19 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (35.5/23.2 kN vs 29.1/19 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (35.5/23.2 kN vs 31/20.8 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (35.5/23.2 kN vs 31/20.8 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope with catalogue ratings within 10 %; 7207 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-207-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (35.5/23.2 kN vs 49/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7207 BEP shares the 35×72×17 mm angular-contact envelope, but catalogue C/C0 differ (35.5/23.2 kN vs 29.1/19 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7207-ACCBM",
      "7207 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7307-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7307 BE-2RZP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39,
    "static_load_kN": 24.5,
    "fatigue_load_limit_kN": 1.04,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7307 BE-2RZP is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 35×80×21 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 35×80×21 mm (1.378×3.15×0.827 in), 22.5 mm radial section height, C 39 kN, C0 24.5 kN, Pu 1.04 kN.reference speed 11,000 r/min (thermal) and limiting speed 8,500 r/min (mechanical), catalogue mass 450 g. Load balance: C0 24.5 kN against C 39 kN gives a 0.63 ratio, typical of a steep-angle axial-oriented design; Pu 1.04 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 450 g inside the 35×80×21 mm outline leaves a 22.5 mm radial section, and the 24.5 kN static rating is 0.63× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 8,500 r/min limiting speed, i.e. a reference-to-limit ratio of 1.29. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7307-BE-2RZP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Assign interference to the rotating ring — roughly k5 on a 35 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7307-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7307-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7307-BE-2RZP?",
        "a": "7307 BE-2RZP measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 450 g. SKF 17000 ratings: C 39 kN, C0 24.5 kN, Pu 1.04 kN, reference speed 11,000 r/min (thermal) and limiting speed 8,500 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "Can one 7307-BE-2RZP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7307-BE-2RZP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7307-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7307-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (39/24.5 kN vs 46.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (39/24.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (39/24.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (39/24.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7307 BEP is the basic 35×80×21 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7307-BE-2RZP",
      "7307 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7307-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7307 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39,
    "static_load_kN": 24.5,
    "fatigue_load_limit_kN": 1.04,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7307 BEP is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 35×80×21 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 35×80×21 mm (1.378×3.15×0.827 in), 22.5 mm radial section height, C 39 kN, C0 24.5 kN, Pu 1.04 kN.reference speed 11,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 450 g. Load balance: C0 24.5 kN against C 39 kN gives a 0.63 ratio, typical of a steep-angle axial-oriented design; Pu 1.04 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 450 g inside the 35×80×21 mm outline leaves a 22.5 mm radial section, and the 24.5 kN static rating is 0.63× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 10,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.10. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7307-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7307 BEP as the single basic pa66 execution; the other order numbers of the 7307 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7307-BEP?",
        "a": "7307 BEP measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 450 g. SKF 17000 ratings: C 39 kN, C0 24.5 kN, Pu 1.04 kN, reference speed 11,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which grease and fill for 7307-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 10,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7307-BEP?",
        "a": "The 11,000 r/min reference (thermal) and 10,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7307-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7307-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (39/24.5 kN vs 46.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (39/24.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (39/24.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (39/24.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7307 BEP is the basic 35×80×21 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7307-BEP",
      "7307 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7307-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7307 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 41.5,
    "static_load_kN": 26.5,
    "fatigue_load_limit_kN": 1.14,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7307 BECBP is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 35×80×21 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 35×80×21 mm (1.378×3.15×0.827 in), 22.5 mm radial section height, C 41.5 kN, C0 26.5 kN, Pu 1.14 kN.reference speed 11,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), which coincide for this size, catalogue mass 450 g. The 1.14 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 41.5/26.5 kN ratings and 450 g mass this execution carries about 1.19 kN of C per millimetre of bore. Load balance: C0 26.5 kN against C 41.5 kN gives a 0.64 ratio, typical of a steep-angle axial-oriented design; Pu 1.14 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 11,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "raceway staining from water in the lubricant during idle periods",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7307-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7307-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7307-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7307-BECBP?",
        "a": "7307 BECBP measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 450 g. SKF 17000 ratings: C 41.5 kN, C0 26.5 kN, Pu 1.14 kN, reference speed 11,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7307-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7307-BECBP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7307-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7307-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 46.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7307 BEP is the basic 35×80×21 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7307-BECBP",
      "7307 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7307-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7307 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 41.5,
    "static_load_kN": 26.5,
    "fatigue_load_limit_kN": 1.14,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7307 BECBY is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 35×80×21 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 35×80×21 mm (1.378×3.15×0.827 in), 22.5 mm radial section height, C 41.5 kN, C0 26.5 kN, Pu 1.14 kN.reference speed 11,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), which coincide for this size, catalogue mass 450 g. Mass and section check: 450 g inside the 35×80×21 mm outline leaves a 22.5 mm radial section, and the 26.5 kN static rating is 0.64× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 26.5 kN against C 41.5 kN gives a 0.64 ratio, typical of a steep-angle axial-oriented design; Pu 1.14 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 11,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7307-BECBY of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7307-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7307-BECBY?",
        "a": "7307 BECBY measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 450 g. SKF 17000 ratings: C 41.5 kN, C0 26.5 kN, Pu 1.14 kN, reference speed 11,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Can one 7307-BECBY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7307-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7307-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7307-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 46.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7307 BEP is the basic 35×80×21 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7307-BECBY",
      "7307 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7307-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7307 BEGAPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 41.5,
    "static_load_kN": 26.5,
    "fatigue_load_limit_kN": 1.14,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7307 BEGAPH is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 35×80×21 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 35×80×21 mm (1.378×3.15×0.827 in), 22.5 mm radial section height, C 41.5 kN, C0 26.5 kN, Pu 1.14 kN.reference speed 11,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), which coincide for this size, catalogue mass 450 g. Load balance: C0 26.5 kN against C 41.5 kN gives a 0.64 ratio, typical of a steep-angle axial-oriented design; Pu 1.14 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 11,000 r/min while thermal balance under catalogue load sets the 11,000 r/min reference; at dm ≈ 57.5 mm the corresponding dn is approximately 633k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 11,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 21 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Fillet radii must clear the chamfer so the 21 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7307-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7307-BEGAPH?",
        "a": "7307 BEGAPH measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 450 g. SKF 17000 ratings: C 41.5 kN, C0 26.5 kN, Pu 1.14 kN, reference speed 11,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "Which grease and fill for 7307-BEGAPH?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 11,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7307-BEGAPH?",
        "a": "The 11,000 r/min reference (thermal) and 11,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7307-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7307-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 46.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7307 BEP is the basic 35×80×21 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7307-BEGAPH",
      "7307 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7307-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7307 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 41.5,
    "static_load_kN": 26.5,
    "fatigue_load_limit_kN": 1.14,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7307 BECBM is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 35×80×21 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 35×80×21 mm (1.378×3.15×0.827 in), 22.5 mm radial section height, C 41.5 kN, C0 26.5 kN, Pu 1.14 kN.reference speed 11,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical), catalogue mass 450 g. Envelope economics: the 21 mm width over a 22.5 mm section yields 0.93 mm of ring width per section millimetre, and the bearing weighs 450 g for 41.5 kN of dynamic capacity — about 11 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 14,000 r/min while thermal balance under catalogue load sets the 11,000 r/min reference; at dm ≈ 57.5 mm the corresponding dn is approximately 805k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 14,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.79. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "One 7307-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7307-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7307-BECBM?",
        "a": "7307 BECBM measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 450 g. SKF 17000 ratings: C 41.5 kN, C0 26.5 kN, Pu 1.14 kN, reference speed 11,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7307-BECBM?",
        "a": "With a rotating inner ring use roughly k5 on the 35 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7307-BECBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 14,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7307-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7307-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; 7307 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 46.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (41.5/26.5 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7307 BEP is the basic 35×80×21 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7307-BECBM",
      "7307 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7307-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7307 ACCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 46.5,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 1.27,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 17000,
    "max_rpm": 17000,
    "weight_g": 450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7307 ACCBM is SKF's 35 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 25° (AC) contact angle, 35×80×21 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 35×80×21 mm (1.378×3.15×0.827 in), 22.5 mm radial section height, C 46.5 kN, C0 30 kN, Pu 1.27 kN.reference speed 11,000 r/min (thermal) and limiting speed 17,000 r/min (mechanical), catalogue mass 450 g. Selection figures for 7307 ACCBM: the static-to-dynamic ratio C0/C is 0.65, Pu 1.27 kN is about 3 % of C, and catalogue mass works out to roughly 13 g per millimetre of bore. At the printed limiting speed of 17,000 r/min the mean pitch diameter dm ≈ 57.5 mm implies a dn value around 978k mm·r/min; the 11,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 80 over bore 35 is a 2.29× step for this size, and the 21 mm width gives a bore/width ratio of 1.67; use these ratios when housing space around the 35 mm shaft is the first constraint. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Preload the set against a calculated stand-off dimension — the ground faces of ACCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7307-ACCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The 25° AC angle of 7307-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7307-ACCBM?",
        "a": "7307 ACCBM measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 450 g. SKF 17000 ratings: C 46.5 kN, C0 30 kN, Pu 1.27 kN, reference speed 11,000 r/min (thermal) and limiting speed 17,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7307-ACCBM?",
        "a": "With a rotating inner ring use roughly k5 on the 35 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7307-ACCBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 17,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7307-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7307-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (46.5/30 kN vs 39/24.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (46.5/30 kN vs 39/24.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (46.5/30 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (46.5/30 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (46.5/30 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (46.5/30 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (46.5/30 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (46.5/30 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (46.5/30 kN vs 64/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7307 BEP shares the 35×80×21 mm angular-contact envelope, but catalogue C/C0 differ (46.5/30 kN vs 39/24.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7307-ACCBM",
      "7307 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7208-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7208 BE-2RZP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 34.5,
    "static_load_kN": 24,
    "fatigue_load_limit_kN": 1.02,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7208 BE-2RZP is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 40×80×18 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 40×80×18 mm (1.575×3.15×0.709 in), 20.0 mm radial section height, C 34.5 kN, C0 24 kN, Pu 1.02 kN.reference speed 10,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical), catalogue mass 420 g. Sizing arithmetic on the 40 mm bore: 34.5 kN C divided by the 20.0 mm radial section height gives 1.7 kN per section millimetre; the 420 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. The 1.02 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 34.5/24 kN ratings and 420 g mass this execution carries about 0.86 kN of C per millimetre of bore. Bore-to-OD planning: OD 80 over bore 40 is a 2.00× step for this size, and the 18 mm width gives a bore/width ratio of 2.22; use these ratios when housing space around the 40 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps",
      "industrial transmissions"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7208-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7208-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7208-BE-2RZP?",
        "a": "7208 BE-2RZP measures 40 mm bore × 80 mm OD × 18 mm width (1.575 × 3.15 × 0.709 in), mass about 420 g. SKF 17000 ratings: C 34.5 kN, C0 24 kN, Pu 1.02 kN, reference speed 10,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "Which grease and fill for 7208-BE-2RZP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 8,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7208-BE-2RZP?",
        "a": "The 10,000 r/min reference (thermal) and 8,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7208-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7208-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (34.5/24 kN vs 39/28 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (34.5/24 kN vs 41.5/29 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-208-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (34.5/24 kN vs 56/49 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7208 BEP is the basic 40×80×18 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7208-BE-2RZP",
      "7208 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7208-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7208 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 34.5,
    "static_load_kN": 24,
    "fatigue_load_limit_kN": 1.02,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7208 BEP is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 40×80×18 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 40×80×18 mm (1.575×3.15×0.709 in), 20.0 mm radial section height, C 34.5 kN, C0 24 kN, Pu 1.02 kN.reference speed 10,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical), which coincide for this size, catalogue mass 370 g. Sizing arithmetic on the 40 mm bore: 34.5 kN C divided by the 20.0 mm radial section height gives 1.7 kN per section millimetre; the 370 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. The 1.02 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 34.5/24 kN ratings and 370 g mass this execution carries about 0.86 kN of C per millimetre of bore. Bore-to-OD planning: OD 80 over bore 40 is a 2.00× step for this size, and the 18 mm width gives a bore/width ratio of 2.22; use these ratios when housing space around the 40 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps",
      "industrial transmissions"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7208-BEP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Fillet radii must clear the chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7208-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7208 BEP as the single basic pa66 execution; the other order numbers of the 7208 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7208-BEP?",
        "a": "7208 BEP measures 40 mm bore × 80 mm OD × 18 mm width (1.575 × 3.15 × 0.709 in), mass about 370 g. SKF 17000 ratings: C 34.5 kN, C0 24 kN, Pu 1.02 kN, reference speed 10,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which grease and fill for 7208-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 10,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7208-BEP?",
        "a": "The 10,000 r/min reference (thermal) and 10,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7208-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7208-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (34.5/24 kN vs 39/28 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (34.5/24 kN vs 41.5/29 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-208-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (34.5/24 kN vs 56/49 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7208 BEP is the basic 40×80×18 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7208-BEP",
      "7208 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7208-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7208 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 36.5,
    "static_load_kN": 26,
    "fatigue_load_limit_kN": 1.1,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7208 BECBP is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 40×80×18 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 40×80×18 mm (1.575×3.15×0.709 in), 20.0 mm radial section height, C 36.5 kN, C0 26 kN, Pu 1.1 kN.reference speed 10,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), catalogue mass 370 g. Load balance: C0 26 kN against C 36.5 kN gives a 0.71 ratio, typical of a steep-angle axial-oriented design; Pu 1.1 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 40 mm bore: 36.5 kN C divided by the 20.0 mm radial section height gives 1.8 kN per section millimetre; the 370 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 80 over bore 40 is a 2.00× step for this size, and the 18 mm width gives a bore/width ratio of 2.22; use these ratios when housing space around the 40 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7208-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7208-BECBP?",
        "a": "7208 BECBP measures 40 mm bore × 80 mm OD × 18 mm width (1.575 × 3.15 × 0.709 in), mass about 370 g. SKF 17000 ratings: C 36.5 kN, C0 26 kN, Pu 1.1 kN, reference speed 10,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7208-BECBP?",
        "a": "With a rotating inner ring use roughly k5 on the 40 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7208-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7208-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (36.5/26 kN vs 41.5/29 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-208-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (36.5/26 kN vs 56/49 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7208 BEP is the basic 40×80×18 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7208-BECBP",
      "7208 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7208-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7208 BECBPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 36.5,
    "static_load_kN": 26,
    "fatigue_load_limit_kN": 1.1,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7208 BECBPH is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 40×80×18 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 40×80×18 mm (1.575×3.15×0.709 in), 20.0 mm radial section height, C 36.5 kN, C0 26 kN, Pu 1.1 kN.reference speed 10,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), catalogue mass 370 g. Sizing arithmetic on the 40 mm bore: 36.5 kN C divided by the 20.0 mm radial section height gives 1.8 kN per section millimetre; the 370 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 18 mm width over a 20.0 mm section yields 0.90 mm of ring width per section millimetre, and the bearing weighs 370 g for 36.5 kN of dynamic capacity — about 10 g per rated kN. Bore-to-OD planning: OD 80 over bore 40 is a 2.00× step for this size, and the 18 mm width gives a bore/width ratio of 2.22; use these ratios when housing space around the 40 mm shaft is the first constraint. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 40 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Assign interference to the rotating ring — roughly k5 on a 40 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7208-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7208-BECBPH?",
        "a": "7208 BECBPH measures 40 mm bore × 80 mm OD × 18 mm width (1.575 × 3.15 × 0.709 in), mass about 370 g. SKF 17000 ratings: C 36.5 kN, C0 26 kN, Pu 1.1 kN, reference speed 10,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "Can one 7208-BECBPH take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7208-BECBPH need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7208-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7208-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (36.5/26 kN vs 41.5/29 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-208-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (36.5/26 kN vs 56/49 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7208 BEP is the basic 40×80×18 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7208-BECBPH",
      "7208 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7208-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7208 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 36.5,
    "static_load_kN": 26,
    "fatigue_load_limit_kN": 1.1,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7208 BECBM is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 40×80×18 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 40×80×18 mm (1.575×3.15×0.709 in), 20.0 mm radial section height, C 36.5 kN, C0 26 kN, Pu 1.1 kN.reference speed 10,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical), catalogue mass 370 g. At the printed limiting speed of 13,000 r/min the mean pitch diameter dm ≈ 60.0 mm implies a dn value around 780k mm·r/min; the 10,000 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 18 mm width over a 20.0 mm section yields 0.90 mm of ring width per section millimetre, and the bearing weighs 370 g for 36.5 kN of dynamic capacity — about 10 g per rated kN. Bore-to-OD planning: OD 80 over bore 40 is a 2.00× step for this size, and the 18 mm width gives a bore/width ratio of 2.22; use these ratios when housing space around the 40 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "At 40 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7208-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7208-BECBM?",
        "a": "7208 BECBM measures 40 mm bore × 80 mm OD × 18 mm width (1.575 × 3.15 × 0.709 in), mass about 370 g. SKF 17000 ratings: C 36.5 kN, C0 26 kN, Pu 1.1 kN, reference speed 10,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7208-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7208-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7208-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (36.5/26 kN vs 41.5/29 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-208-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (36.5/26 kN vs 56/49 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7208 BEP is the basic 40×80×18 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7208-BECBM",
      "7208 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7208-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7208 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 39,
    "static_load_kN": 28,
    "fatigue_load_limit_kN": 1.2,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7208 BECBY is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 40×80×18 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 40×80×18 mm (1.575×3.15×0.709 in), 20.0 mm radial section height, C 39 kN, C0 28 kN, Pu 1.2 kN.reference speed 10,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), catalogue mass 370 g. The 1.2 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 39/28 kN ratings and 370 g mass this execution carries about 0.97 kN of C per millimetre of bore. Sizing arithmetic on the 40 mm bore: 39 kN C divided by the 20.0 mm radial section height gives 1.9 kN per section millimetre; the 370 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 80 over bore 40 is a 2.00× step for this size, and the 18 mm width gives a bore/width ratio of 2.22; use these ratios when housing space around the 40 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "One 7208-BECBY locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "One 7208-BECBY locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7208-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7208-BECBY?",
        "a": "7208 BECBY measures 40 mm bore × 80 mm OD × 18 mm width (1.575 × 3.15 × 0.709 in), mass about 370 g. SKF 17000 ratings: C 39 kN, C0 28 kN, Pu 1.2 kN, reference speed 10,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which grease and fill for 7208-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 11,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7208-BECBY?",
        "a": "The 10,000 r/min reference (thermal) and 11,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7208-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7208-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (39/28 kN vs 34.5/24 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (39/28 kN vs 34.5/24 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7208-ACCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 ACCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-208-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (39/28 kN vs 56/49 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7208 BEP shares the 40×80×18 mm angular-contact envelope, but catalogue C/C0 differ (39/28 kN vs 34.5/24 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7208-BECBY",
      "7208 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7208-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7208 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 41.5,
    "static_load_kN": 29,
    "fatigue_load_limit_kN": 1.25,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 16000,
    "max_rpm": 16000,
    "weight_g": 370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7208 ACCBM is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 40×80×18 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 40×80×18 mm (1.575×3.15×0.709 in), 20.0 mm radial section height, C 41.5 kN, C0 29 kN, Pu 1.25 kN.reference speed 11,000 r/min (thermal) and limiting speed 16,000 r/min (mechanical), catalogue mass 370 g. At the printed limiting speed of 16,000 r/min the mean pitch diameter dm ≈ 60.0 mm implies a dn value around 960k mm·r/min; the 11,000 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 18 mm width over a 20.0 mm section yields 0.90 mm of ring width per section millimetre, and the bearing weighs 370 g for 41.5 kN of dynamic capacity — about 9 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 16,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.69. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "centrifugal and vacuum pumps",
      "industrial transmissions",
      "printing cylinders and packaging shafts"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "edge loading from shaft deflection or housing misalignment",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 40 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Fillet radii must clear the chamfer so the 18 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The 25° AC angle of 7208-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7208-ACCBM?",
        "a": "7208 ACCBM measures 40 mm bore × 80 mm OD × 18 mm width (1.575 × 3.15 × 0.709 in), mass about 370 g. SKF 17000 ratings: C 41.5 kN, C0 29 kN, Pu 1.25 kN, reference speed 11,000 r/min (thermal) and limiting speed 16,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7208-ACCBM?",
        "a": "The 11,000 r/min reference (thermal) and 16,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7208-ACCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 25° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7208-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7208-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (41.5/29 kN vs 34.5/24 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (41.5/29 kN vs 34.5/24 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (41.5/29 kN vs 36.5/26 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (41.5/29 kN vs 36.5/26 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (41.5/29 kN vs 36.5/26 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope with catalogue ratings within 10 %; 7208 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-208-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (41.5/29 kN vs 56/49 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7208 BEP shares the 40×80×18 mm angular-contact envelope, but catalogue C/C0 differ (41.5/29 kN vs 34.5/24 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7208-ACCBM",
      "7208 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7308-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7308 BE-2RZP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 46.2,
    "static_load_kN": 30.5,
    "fatigue_load_limit_kN": 1.29,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7308 BE-2RZP is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 40×90×23 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 40×90×23 mm (1.575×3.543×0.906 in), 25.0 mm radial section height, C 46.2 kN, C0 30.5 kN, Pu 1.29 kN.reference speed 9,500 r/min (thermal) and limiting speed 7,500 r/min (mechanical), catalogue mass 620 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 7,500 r/min while thermal balance under catalogue load sets the 9,500 r/min reference; at dm ≈ 65.0 mm the corresponding dn is approximately 488k mm·r/min. Sizing arithmetic on the 40 mm bore: 46.2 kN C divided by the 25.0 mm radial section height gives 1.8 kN per section millimetre; the 620 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 90 over bore 40 is a 2.25× step for this size, and the 23 mm width gives a bore/width ratio of 1.74; use these ratios when housing space around the 40 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7308-BE-2RZP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "At 40 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "One 7308-BE-2RZP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Fillet radii must clear the chamfer so the 23 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7308-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7308-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7308-BE-2RZP?",
        "a": "7308 BE-2RZP measures 40 mm bore × 90 mm OD × 23 mm width (1.575 × 3.543 × 0.906 in), mass about 620 g. SKF 17000 ratings: C 46.2 kN, C0 30.5 kN, Pu 1.29 kN, reference speed 9,500 r/min (thermal) and limiting speed 7,500 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "Which fits should I use for 7308-BE-2RZP?",
        "a": "With a rotating inner ring use roughly k5 on the 40 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7308-BE-2RZP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 7,500 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7308-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7308-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (46.2/30.5 kN vs 53/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (46.2/30.5 kN vs 56/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (46.2/30.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (46.2/30.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (46.2/30.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7308 BEP is the basic 40×90×23 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7308-BE-2RZP",
      "7308 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7308-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7308 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 46.2,
    "static_load_kN": 30.5,
    "fatigue_load_limit_kN": 1.29,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7308 BEP is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 40×90×23 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 40×90×23 mm (1.575×3.543×0.906 in), 25.0 mm radial section height, C 46.2 kN, C0 30.5 kN, Pu 1.29 kN.reference speed 9,500 r/min (thermal) and limiting speed 9,000 r/min (mechanical), catalogue mass 620 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 9,000 r/min while thermal balance under catalogue load sets the 9,500 r/min reference; at dm ≈ 65.0 mm the corresponding dn is approximately 585k mm·r/min. Sizing arithmetic on the 40 mm bore: 46.2 kN C divided by the 25.0 mm radial section height gives 1.8 kN per section millimetre; the 620 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 90 over bore 40 is a 2.25× step for this size, and the 23 mm width gives a bore/width ratio of 1.74; use these ratios when housing space around the 40 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 40 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "At 40 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7308-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7308 BEP as the single basic pa66 execution; the other order numbers of the 7308 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7308-BEP?",
        "a": "7308 BEP measures 40 mm bore × 90 mm OD × 23 mm width (1.575 × 3.543 × 0.906 in), mass about 620 g. SKF 17000 ratings: C 46.2 kN, C0 30.5 kN, Pu 1.29 kN, reference speed 9,500 r/min (thermal) and limiting speed 9,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which fits should I use for 7308-BEP?",
        "a": "With a rotating inner ring use roughly k5 on the 40 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7308-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 9,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7308-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7308-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (46.2/30.5 kN vs 53/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (46.2/30.5 kN vs 56/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (46.2/30.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (46.2/30.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (46.2/30.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7308 BEP is the basic 40×90×23 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7308-BEP",
      "7308 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7308-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7308 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 50,
    "static_load_kN": 32.5,
    "fatigue_load_limit_kN": 1.37,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7308 BECBP is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 40×90×23 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 40×90×23 mm (1.575×3.543×0.906 in), 25.0 mm radial section height, C 50 kN, C0 32.5 kN, Pu 1.37 kN.reference speed 9,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 620 g. At the printed limiting speed of 10,000 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 650k mm·r/min; the 9,500 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 23 mm width over a 25.0 mm section yields 0.92 mm of ring width per section millimetre, and the bearing weighs 620 g for 50 kN of dynamic capacity — about 12 g per rated kN. Bore-to-OD planning: OD 90 over bore 40 is a 2.25× step for this size, and the 23 mm width gives a bore/width ratio of 1.74; use these ratios when housing space around the 40 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7308-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7308-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7308-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7308-BECBP?",
        "a": "7308 BECBP measures 40 mm bore × 90 mm OD × 23 mm width (1.575 × 3.543 × 0.906 in), mass about 620 g. SKF 17000 ratings: C 50 kN, C0 32.5 kN, Pu 1.37 kN, reference speed 9,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7308-BECBP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7308-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7308-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (50/32.5 kN vs 56/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (50/32.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (50/32.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (50/32.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7308 BEP is the basic 40×90×23 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7308-BECBP",
      "7308 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7308-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7308 BEGAPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 50,
    "static_load_kN": 32.5,
    "fatigue_load_limit_kN": 1.37,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7308 BEGAPH is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 40×90×23 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 40×90×23 mm (1.575×3.543×0.906 in), 25.0 mm radial section height, C 50 kN, C0 32.5 kN, Pu 1.37 kN.reference speed 9,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 620 g. At the printed limiting speed of 10,000 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 650k mm·r/min; the 9,500 r/min reference speed is the thermal-planning figure under catalogue load. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 10,000 r/min while thermal balance under catalogue load sets the 9,500 r/min reference; at dm ≈ 65.0 mm the corresponding dn is approximately 650k mm·r/min. Bore-to-OD planning: OD 90 over bore 40 is a 2.25× step for this size, and the 23 mm width gives a bore/width ratio of 1.74; use these ratios when housing space around the 40 mm shaft is the first constraint. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "edge loading from shaft deflection or housing misalignment",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7308-BEGAPH of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7308-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7308-BEGAPH?",
        "a": "7308 BEGAPH measures 40 mm bore × 90 mm OD × 23 mm width (1.575 × 3.543 × 0.906 in), mass about 620 g. SKF 17000 ratings: C 50 kN, C0 32.5 kN, Pu 1.37 kN, reference speed 9,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "What minimum axial load does 7308-BEGAPH need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7308-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7308-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (50/32.5 kN vs 56/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (50/32.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (50/32.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (50/32.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7308 BEP is the basic 40×90×23 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7308-BEGAPH",
      "7308 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7308-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7308 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 50,
    "static_load_kN": 32.5,
    "fatigue_load_limit_kN": 1.37,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7308 BECBM is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 40×90×23 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 40×90×23 mm (1.575×3.543×0.906 in), 25.0 mm radial section height, C 50 kN, C0 32.5 kN, Pu 1.37 kN.reference speed 9,500 r/min (thermal) and limiting speed 12,000 r/min (mechanical), catalogue mass 680 g. Load balance: C0 32.5 kN against C 50 kN gives a 0.65 ratio, typical of a steep-angle axial-oriented design; Pu 1.37 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 40 mm bore: 50 kN C divided by the 25.0 mm radial section height gives 2.0 kN per section millimetre; the 680 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 90 over bore 40 is a 2.25× step for this size, and the 23 mm width gives a bore/width ratio of 1.74; use these ratios when housing space around the 40 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "One 7308-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Assign interference to the rotating ring — roughly k5 on a 40 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7308-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7308-BECBM?",
        "a": "7308 BECBM measures 40 mm bore × 90 mm OD × 23 mm width (1.575 × 3.543 × 0.906 in), mass about 680 g. SKF 17000 ratings: C 50 kN, C0 32.5 kN, Pu 1.37 kN, reference speed 9,500 r/min (thermal) and limiting speed 12,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7308-BECBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 12,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7308-BECBM?",
        "a": "The 9,500 r/min reference (thermal) and 12,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7308-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7308-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (50/32.5 kN vs 56/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (50/32.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (50/32.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (50/32.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7308 BEP is the basic 40×90×23 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7308-BECBM",
      "7308 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7308-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7308 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 53,
    "static_load_kN": 35.5,
    "fatigue_load_limit_kN": 1.5,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 640,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7308 BECBY is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 40×90×23 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 40×90×23 mm (1.575×3.543×0.906 in), 25.0 mm radial section height, C 53 kN, C0 35.5 kN, Pu 1.5 kN.reference speed 9,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 640 g. At the printed limiting speed of 10,000 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 650k mm·r/min; the 9,500 r/min reference speed is the thermal-planning figure under catalogue load. The 1.5 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 53/35.5 kN ratings and 640 g mass this execution carries about 1.32 kN of C per millimetre of bore. Bore-to-OD planning: OD 90 over bore 40 is a 2.25× step for this size, and the 23 mm width gives a bore/width ratio of 1.74; use these ratios when housing space around the 40 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Assign interference to the rotating ring — roughly k5 on a 40 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Do not mix execution classes inside one set: a universally matchable BECBY unit is ground for arbitrary pairing, a basic execution is not.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7308-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7308-BECBY?",
        "a": "7308 BECBY measures 40 mm bore × 90 mm OD × 23 mm width (1.575 × 3.543 × 0.906 in), mass about 640 g. SKF 17000 ratings: C 53 kN, C0 35.5 kN, Pu 1.5 kN, reference speed 9,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which fits should I use for 7308-BECBY?",
        "a": "With a rotating inner ring use roughly k5 on the 40 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7308-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 10,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7308-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7308-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (53/35.5 kN vs 46.2/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (53/35.5 kN vs 46.2/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308-ACCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 ACCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-308-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (53/35.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (53/35.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (53/35.5 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7308 BEP shares the 40×90×23 mm angular-contact envelope, but catalogue C/C0 differ (53/35.5 kN vs 46.2/30.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7308-BECBY",
      "7308 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7308-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7308 ACCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 56,
    "static_load_kN": 36,
    "fatigue_load_limit_kN": 1.53,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7308 ACCBM is SKF's 40 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 25° (AC) contact angle, 40×90×23 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 40×90×23 mm (1.575×3.543×0.906 in), 25.0 mm radial section height, C 56 kN, C0 36 kN, Pu 1.53 kN.reference speed 10,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical), catalogue mass 680 g. Mass and section check: 680 g inside the 40×90×23 mm outline leaves a 25.0 mm radial section, and the 36 kN static rating is 0.64× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 1.53 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 56/36 kN ratings and 680 g mass this execution carries about 1.40 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 10,000 r/min against a 15,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.67. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7308-ACCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "One 7308-ACCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 0,55 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The 25° AC angle of 7308-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7308-ACCBM?",
        "a": "7308 ACCBM measures 40 mm bore × 90 mm OD × 23 mm width (1.575 × 3.543 × 0.906 in), mass about 680 g. SKF 17000 ratings: C 56 kN, C0 36 kN, Pu 1.53 kN, reference speed 10,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7308-ACCBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 15,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7308-ACCBM?",
        "a": "The 10,000 r/min reference (thermal) and 15,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7308-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7308-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (56/36 kN vs 46.2/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (56/36 kN vs 46.2/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (56/36 kN vs 50/32.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (56/36 kN vs 50/32.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (56/36 kN vs 50/32.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; 7308 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-308-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (56/36 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (56/36 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (56/36 kN vs 78/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7308 BEP shares the 40×90×23 mm angular-contact envelope, but catalogue C/C0 differ (56/36 kN vs 46.2/30.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7308-ACCBM",
      "7308 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7209-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7209 BE-2RZP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 35.8,
    "static_load_kN": 26,
    "fatigue_load_limit_kN": 1.12,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 520,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7209 BE-2RZP is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 45×85×19 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 45×85×19 mm (1.772×3.346×0.748 in), 20.0 mm radial section height, C 35.8 kN, C0 26 kN, Pu 1.12 kN.reference speed 9,500 r/min (thermal) and limiting speed 7,500 r/min (mechanical), catalogue mass 520 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 7,500 r/min while thermal balance under catalogue load sets the 9,500 r/min reference; at dm ≈ 65.0 mm the corresponding dn is approximately 488k mm·r/min. Sizing arithmetic on the 45 mm bore: 35.8 kN C divided by the 20.0 mm radial section height gives 1.8 kN per section millimetre; the 520 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 85 over bore 45 is a 1.89× step for this size, and the 19 mm width gives a bore/width ratio of 2.37; use these ratios when housing space around the 45 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7209-BE-2RZP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Fillet radii must clear the chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7209-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7209-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7209-BE-2RZP?",
        "a": "7209 BE-2RZP measures 45 mm bore × 85 mm OD × 19 mm width (1.772 × 3.346 × 0.748 in), mass about 520 g. SKF 17000 ratings: C 35.8 kN, C0 26 kN, Pu 1.12 kN, reference speed 9,500 r/min (thermal) and limiting speed 7,500 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7209-BE-2RZP?",
        "a": "The 9,500 r/min reference (thermal) and 7,500 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7209-BE-2RZP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7209-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7209-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (35.8/26 kN vs 40/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (35.8/26 kN vs 44/32 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-209-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (35.8/26 kN vs 63/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7209 BECBP is the basic 45×85×19 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7209-BE-2RZP",
      "7209 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7209-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7209 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 38,
    "static_load_kN": 28.5,
    "fatigue_load_limit_kN": 1.22,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7209 BECBP is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 45×85×19 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 45×85×19 mm (1.772×3.346×0.748 in), 20.0 mm radial section height, C 38 kN, C0 28.5 kN, Pu 1.22 kN.reference speed 9,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 420 g. At the printed limiting speed of 10,000 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 650k mm·r/min; the 9,500 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 19 mm width over a 20.0 mm section yields 0.95 mm of ring width per section millimetre, and the bearing weighs 420 g for 38 kN of dynamic capacity — about 11 g per rated kN. Bore-to-OD planning: OD 85 over bore 45 is a 1.89× step for this size, and the 19 mm width gives a bore/width ratio of 2.37; use these ratios when housing space around the 45 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "At 45 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "One 7209-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7209-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7209-BECBP?",
        "a": "7209 BECBP measures 45 mm bore × 85 mm OD × 19 mm width (1.772 × 3.346 × 0.748 in), mass about 420 g. SKF 17000 ratings: C 38 kN, C0 28.5 kN, Pu 1.22 kN, reference speed 9,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7209-BECBP?",
        "a": "With a rotating inner ring use roughly k5 on the 45 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7209-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 10,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7209-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7209-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (38/28.5 kN vs 44/32 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-209-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (38/28.5 kN vs 63/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7209 BECBP is the basic 45×85×19 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7209-BECBP",
      "7209 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7209-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7209 BEGAPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 38,
    "static_load_kN": 28.5,
    "fatigue_load_limit_kN": 1.22,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7209 BEGAPH is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 45×85×19 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 45×85×19 mm (1.772×3.346×0.748 in), 20.0 mm radial section height, C 38 kN, C0 28.5 kN, Pu 1.22 kN.reference speed 9,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 420 g. At the printed limiting speed of 10,000 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 650k mm·r/min; the 9,500 r/min reference speed is the thermal-planning figure under catalogue load. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 10,000 r/min while thermal balance under catalogue load sets the 9,500 r/min reference; at dm ≈ 65.0 mm the corresponding dn is approximately 650k mm·r/min. Bore-to-OD planning: OD 85 over bore 45 is a 1.89× step for this size, and the 19 mm width gives a bore/width ratio of 2.37; use these ratios when housing space around the 45 mm shaft is the first constraint. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "edge loading from shaft deflection or housing misalignment",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BEGAPH unit is ground for arbitrary pairing, a basic execution is not.",
      "Fillet radii must clear the chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7209-BEGAPH of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7209-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7209-BEGAPH?",
        "a": "7209 BEGAPH measures 45 mm bore × 85 mm OD × 19 mm width (1.772 × 3.346 × 0.748 in), mass about 420 g. SKF 17000 ratings: C 38 kN, C0 28.5 kN, Pu 1.22 kN, reference speed 9,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7209-BEGAPH?",
        "a": "The 9,500 r/min reference (thermal) and 10,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7209-BEGAPH take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7209-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7209-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (38/28.5 kN vs 44/32 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-209-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (38/28.5 kN vs 63/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7209 BECBP is the basic 45×85×19 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7209-BEGAPH",
      "7209 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7209-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7209 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 38,
    "static_load_kN": 28.5,
    "fatigue_load_limit_kN": 1.22,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7209 BECBM is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 45×85×19 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 45×85×19 mm (1.772×3.346×0.748 in), 20.0 mm radial section height, C 38 kN, C0 28.5 kN, Pu 1.22 kN.reference speed 9,500 r/min (thermal) and limiting speed 12,000 r/min (mechanical), catalogue mass 420 g. Load balance: C0 28.5 kN against C 38 kN gives a 0.75 ratio, typical of a steep-angle axial-oriented design; Pu 1.22 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 45 mm bore: 38 kN C divided by the 20.0 mm radial section height gives 1.9 kN per section millimetre; the 420 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 85 over bore 45 is a 1.89× step for this size, and the 19 mm width gives a bore/width ratio of 2.37; use these ratios when housing space around the 45 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Fillet radii must clear the chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "At 45 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7209-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7209-BECBM?",
        "a": "7209 BECBM measures 45 mm bore × 85 mm OD × 19 mm width (1.772 × 3.346 × 0.748 in), mass about 420 g. SKF 17000 ratings: C 38 kN, C0 28.5 kN, Pu 1.22 kN, reference speed 9,500 r/min (thermal) and limiting speed 12,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7209-BECBM?",
        "a": "With a rotating inner ring use roughly k5 on the 45 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7209-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7209-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (38/28.5 kN vs 44/32 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-209-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (38/28.5 kN vs 63/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7209 BECBP is the basic 45×85×19 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7209-BECBM",
      "7209 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7209-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7209 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 40,
    "static_load_kN": 30.5,
    "fatigue_load_limit_kN": 1.29,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7209 BECBY is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 45×85×19 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 45×85×19 mm (1.772×3.346×0.748 in), 20.0 mm radial section height, C 40 kN, C0 30.5 kN, Pu 1.29 kN.reference speed 9,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 420 g. At the printed limiting speed of 10,000 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 650k mm·r/min; the 9,500 r/min reference speed is the thermal-planning figure under catalogue load. The 1.29 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 40/30.5 kN ratings and 420 g mass this execution carries about 0.89 kN of C per millimetre of bore. Bore-to-OD planning: OD 85 over bore 45 is a 1.89× step for this size, and the 19 mm width gives a bore/width ratio of 2.37; use these ratios when housing space around the 45 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Fillet radii must clear the chamfer so the 19 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring — roughly k5 on a 45 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "One 7209-BECBY locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7209-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7209-BECBY?",
        "a": "7209 BECBY measures 45 mm bore × 85 mm OD × 19 mm width (1.772 × 3.346 × 0.748 in), mass about 420 g. SKF 17000 ratings: C 40 kN, C0 30.5 kN, Pu 1.29 kN, reference speed 9,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What minimum axial load does 7209-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7209-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7209-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (40/30.5 kN vs 35.8/26 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7209-ACCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 ACCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-209-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (40/30.5 kN vs 63/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7209 BECBP is the basic 45×85×19 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7209-BECBY",
      "7209 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7209-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7209 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 44,
    "static_load_kN": 32,
    "fatigue_load_limit_kN": 1.37,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7209 ACCBM is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 45×85×19 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 45×85×19 mm (1.772×3.346×0.748 in), 20.0 mm radial section height, C 44 kN, C0 32 kN, Pu 1.37 kN.reference speed 10,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical), catalogue mass 420 g. Mass and section check: 420 g inside the 45×85×19 mm outline leaves a 20.0 mm radial section, and the 32 kN static rating is 0.73× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 1.37 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 44/32 kN ratings and 420 g mass this execution carries about 0.98 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 10,000 r/min against a 15,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.67. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "At 45 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Preload the set against a calculated stand-off dimension — the ground faces of ACCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The 25° AC angle of 7209-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7209-ACCBM?",
        "a": "7209 ACCBM measures 45 mm bore × 85 mm OD × 19 mm width (1.772 × 3.346 × 0.748 in), mass about 420 g. SKF 17000 ratings: C 44 kN, C0 32 kN, Pu 1.37 kN, reference speed 10,000 r/min (thermal) and limiting speed 15,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7209-ACCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 25° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7209-ACCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7209-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7209-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (44/32 kN vs 35.8/26 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (44/32 kN vs 38/28.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (44/32 kN vs 38/28.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (44/32 kN vs 38/28.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope with catalogue ratings within 10 %; 7209 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-209-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (44/32 kN vs 63/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7209 BECBP shares the 45×85×19 mm angular-contact envelope, but catalogue C/C0 differ (44/32 kN vs 38/28.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7209-ACCBM",
      "7209 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7309-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7309 BE-2RZP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 55.9,
    "static_load_kN": 37.5,
    "fatigue_load_limit_kN": 1.6,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7309 BE-2RZP is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 45×100×25 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 45×100×25 mm (1.772×3.937×0.984 in), 27.5 mm radial section height, C 55.9 kN, C0 37.5 kN, Pu 1.6 kN.reference speed 8,500 r/min (thermal) and limiting speed 6,700 r/min (mechanical), catalogue mass 850 g. Sizing arithmetic on the 45 mm bore: 55.9 kN C divided by the 27.5 mm radial section height gives 2.0 kN per section millimetre; the 850 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. The 1.6 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 55.9/37.5 kN ratings and 850 g mass this execution carries about 1.24 kN of C per millimetre of bore. Bore-to-OD planning: OD 100 over bore 45 is a 2.22× step for this size, and the 25 mm width gives a bore/width ratio of 1.80; use these ratios when housing space around the 45 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps",
      "industrial transmissions"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7309-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7309-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7309-BE-2RZP?",
        "a": "7309 BE-2RZP measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 850 g. SKF 17000 ratings: C 55.9 kN, C0 37.5 kN, Pu 1.6 kN, reference speed 8,500 r/min (thermal) and limiting speed 6,700 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "Can one 7309-BE-2RZP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7309-BE-2RZP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7309-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7309-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (55.9/37.5 kN vs 64/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (55.9/37.5 kN vs 68/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (55.9/37.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (55.9/37.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (55.9/37.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (55.9/37.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7309 BEP is the basic 45×100×25 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7309-BE-2RZP",
      "7309 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7309-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7309 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 55.9,
    "static_load_kN": 37.5,
    "fatigue_load_limit_kN": 1.6,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 820,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7309 BEP is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 45×100×25 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 45×100×25 mm (1.772×3.937×0.984 in), 27.5 mm radial section height, C 55.9 kN, C0 37.5 kN, Pu 1.6 kN.reference speed 8,500 r/min (thermal) and limiting speed 8,000 r/min (mechanical), catalogue mass 820 g. Sizing arithmetic on the 45 mm bore: 55.9 kN C divided by the 27.5 mm radial section height gives 2.0 kN per section millimetre; the 820 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. The 1.6 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 55.9/37.5 kN ratings and 820 g mass this execution carries about 1.24 kN of C per millimetre of bore. Bore-to-OD planning: OD 100 over bore 45 is a 2.22× step for this size, and the 25 mm width gives a bore/width ratio of 1.80; use these ratios when housing space around the 45 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps",
      "industrial transmissions"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7309-BEP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7309-BEP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7309-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7309 BEP as the single basic pa66 execution; the other order numbers of the 7309 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7309-BEP?",
        "a": "7309 BEP measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 820 g. SKF 17000 ratings: C 55.9 kN, C0 37.5 kN, Pu 1.6 kN, reference speed 8,500 r/min (thermal) and limiting speed 8,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Can one 7309-BEP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7309-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7309-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7309-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (55.9/37.5 kN vs 64/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (55.9/37.5 kN vs 68/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (55.9/37.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (55.9/37.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (55.9/37.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (55.9/37.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7309 BEP is the basic 45×100×25 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7309-BEP",
      "7309 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7309-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7309 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 61,
    "static_load_kN": 40.5,
    "fatigue_load_limit_kN": 1.73,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 820,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7309 BECBP is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 45×100×25 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 45×100×25 mm (1.772×3.937×0.984 in), 27.5 mm radial section height, C 61 kN, C0 40.5 kN, Pu 1.73 kN.reference speed 8,500 r/min (thermal) and limiting speed 9,000 r/min (mechanical), catalogue mass 820 g. Load balance: C0 40.5 kN against C 61 kN gives a 0.66 ratio, typical of a steep-angle axial-oriented design; Pu 1.73 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 45 mm bore: 61 kN C divided by the 27.5 mm radial section height gives 2.2 kN per section millimetre; the 820 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 100 over bore 45 is a 2.22× step for this size, and the 25 mm width gives a bore/width ratio of 1.80; use these ratios when housing space around the 45 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7309-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7309-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7309-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7309-BECBP?",
        "a": "7309 BECBP measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 820 g. SKF 17000 ratings: C 61 kN, C0 40.5 kN, Pu 1.73 kN, reference speed 8,500 r/min (thermal) and limiting speed 9,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7309-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7309-BECBP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7309-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7309-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 64/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 68/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7309 BEP is the basic 45×100×25 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7309-BECBP",
      "7309 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7309-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7309 BEGAPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 61,
    "static_load_kN": 40.5,
    "fatigue_load_limit_kN": 1.73,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 820,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7309 BEGAPH is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 45×100×25 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 45×100×25 mm (1.772×3.937×0.984 in), 27.5 mm radial section height, C 61 kN, C0 40.5 kN, Pu 1.73 kN.reference speed 8,500 r/min (thermal) and limiting speed 9,000 r/min (mechanical), catalogue mass 820 g. Sizing arithmetic on the 45 mm bore: 61 kN C divided by the 27.5 mm radial section height gives 2.2 kN per section millimetre; the 820 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 25 mm width over a 27.5 mm section yields 0.91 mm of ring width per section millimetre, and the bearing weighs 820 g for 61 kN of dynamic capacity — about 13 g per rated kN. Bore-to-OD planning: OD 100 over bore 45 is a 2.22× step for this size, and the 25 mm width gives a bore/width ratio of 1.80; use these ratios when housing space around the 45 mm shaft is the first constraint. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 45 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7309-BEGAPH of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Fillet radii must clear the chamfer so the 25 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7309-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7309-BEGAPH?",
        "a": "7309 BEGAPH measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 820 g. SKF 17000 ratings: C 61 kN, C0 40.5 kN, Pu 1.73 kN, reference speed 8,500 r/min (thermal) and limiting speed 9,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "Which grease and fill for 7309-BEGAPH?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 9,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7309-BEGAPH?",
        "a": "The 8,500 r/min reference (thermal) and 9,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7309-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7309-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 64/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 68/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7309 BEP is the basic 45×100×25 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7309-BEGAPH",
      "7309 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7309-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7309 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 61,
    "static_load_kN": 40.5,
    "fatigue_load_limit_kN": 1.73,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 910,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7309 BECBM is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 45×100×25 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 45×100×25 mm (1.772×3.937×0.984 in), 27.5 mm radial section height, C 61 kN, C0 40.5 kN, Pu 1.73 kN.reference speed 8,500 r/min (thermal) and limiting speed 11,000 r/min (mechanical), catalogue mass 910 g. At the printed limiting speed of 11,000 r/min the mean pitch diameter dm ≈ 72.5 mm implies a dn value around 798k mm·r/min; the 8,500 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 25 mm width over a 27.5 mm section yields 0.91 mm of ring width per section millimetre, and the bearing weighs 910 g for 61 kN of dynamic capacity — about 15 g per rated kN. Bore-to-OD planning: OD 100 over bore 45 is a 2.22× step for this size, and the 25 mm width gives a bore/width ratio of 1.80; use these ratios when housing space around the 45 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "One 7309-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Assign interference to the rotating ring — roughly k5 on a 45 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7309-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7309-BECBM?",
        "a": "7309 BECBM measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 910 g. SKF 17000 ratings: C 61 kN, C0 40.5 kN, Pu 1.73 kN, reference speed 8,500 r/min (thermal) and limiting speed 11,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7309-BECBM?",
        "a": "With a rotating inner ring use roughly k5 on the 45 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7309-BECBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 11,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7309-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7309-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 64/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 68/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (61/40.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7309 BEP is the basic 45×100×25 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7309-BECBM",
      "7309 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7309-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7309 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 64,
    "static_load_kN": 45,
    "fatigue_load_limit_kN": 1.9,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 870,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7309 BECBY is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 45×100×25 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 45×100×25 mm (1.772×3.937×0.984 in), 27.5 mm radial section height, C 64 kN, C0 45 kN, Pu 1.9 kN.reference speed 8,500 r/min (thermal) and limiting speed 9,000 r/min (mechanical), catalogue mass 870 g. The 1.9 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 64/45 kN ratings and 870 g mass this execution carries about 1.42 kN of C per millimetre of bore. Sizing arithmetic on the 45 mm bore: 64 kN C divided by the 27.5 mm radial section height gives 2.3 kN per section millimetre; the 870 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 100 over bore 45 is a 2.22× step for this size, and the 25 mm width gives a bore/width ratio of 1.80; use these ratios when housing space around the 45 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 45 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the chamfer so the 25 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7309-BECBY of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7309-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7309-BECBY?",
        "a": "7309 BECBY measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 870 g. SKF 17000 ratings: C 64 kN, C0 45 kN, Pu 1.9 kN, reference speed 8,500 r/min (thermal) and limiting speed 9,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Can one 7309-BECBY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7309-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7309-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7309-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (64/45 kN vs 55.9/37.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (64/45 kN vs 55.9/37.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (64/45 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (64/45 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (64/45 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-ACCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 ACCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-309-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (64/45 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (64/45 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (64/45 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (64/45 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7309 BEP shares the 45×100×25 mm angular-contact envelope, but catalogue C/C0 differ (64/45 kN vs 55.9/37.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7309-BECBY",
      "7309 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7309-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7309 ACCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 68,
    "static_load_kN": 45.5,
    "fatigue_load_limit_kN": 1.93,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 910,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7309 ACCBM is SKF's 45 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 25° (AC) contact angle, 45×100×25 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 45×100×25 mm (1.772×3.937×0.984 in), 27.5 mm radial section height, C 68 kN, C0 45.5 kN, Pu 1.93 kN.reference speed 9,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical), catalogue mass 910 g. At the printed limiting speed of 13,000 r/min the mean pitch diameter dm ≈ 72.5 mm implies a dn value around 943k mm·r/min; the 9,000 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 25 mm width over a 27.5 mm section yields 0.91 mm of ring width per section millimetre, and the bearing weighs 910 g for 68 kN of dynamic capacity — about 13 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 9,000 r/min against a 13,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.69. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "centrifugal and vacuum pumps",
      "industrial transmissions",
      "printing cylinders and packaging shafts"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "edge loading from shaft deflection or housing misalignment",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of ACCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Do not mix execution classes inside one set: a universally matchable ACCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Do not mix execution classes inside one set: a universally matchable ACCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "One 7309-ACCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The 25° AC angle of 7309-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7309-ACCBM?",
        "a": "7309 ACCBM measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 910 g. SKF 17000 ratings: C 68 kN, C0 45.5 kN, Pu 1.93 kN, reference speed 9,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7309-ACCBM?",
        "a": "The 9,000 r/min reference (thermal) and 13,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7309-ACCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 25° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7309-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7309-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (68/45.5 kN vs 55.9/37.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (68/45.5 kN vs 55.9/37.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (68/45.5 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (68/45.5 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (68/45.5 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; 7309 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-309-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (68/45.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (68/45.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (68/45.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (68/45.5 kN vs 100/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7309 BEP shares the 45×100×25 mm angular-contact envelope, but catalogue C/C0 differ (68/45.5 kN vs 55.9/37.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7309-ACCBM",
      "7309 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7210-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7210 BE-2RZP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 37.7,
    "static_load_kN": 28.5,
    "fatigue_load_limit_kN": 1.22,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7210 BE-2RZP is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 50×90×20 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 50×90×20 mm (1.969×3.543×0.787 in), 20.0 mm radial section height, C 37.7 kN, C0 28.5 kN, Pu 1.22 kN.reference speed 9,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), catalogue mass 550 g. Selection figures for 7210 BE-2RZP: the static-to-dynamic ratio C0/C is 0.76, Pu 1.22 kN is about 3 % of C, and catalogue mass works out to roughly 11 g per millimetre of bore. Load balance: C0 28.5 kN against C 37.7 kN gives a 0.76 ratio, typical of a steep-angle axial-oriented design; Pu 1.22 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 90 over bore 50 is a 1.80× step for this size, and the 20 mm width gives a bore/width ratio of 2.50; use these ratios when housing space around the 50 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "centrifugal and vacuum pumps",
      "industrial transmissions",
      "printing cylinders and packaging shafts"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Fillet radii must clear the chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7210-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7210-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7210-BE-2RZP?",
        "a": "7210 BE-2RZP measures 50 mm bore × 90 mm OD × 20 mm width (1.969 × 3.543 × 0.787 in), mass about 550 g. SKF 17000 ratings: C 37.7 kN, C0 28.5 kN, Pu 1.22 kN, reference speed 9,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7210-BE-2RZP?",
        "a": "The 9,000 r/min reference (thermal) and 7,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7210-BE-2RZP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7210-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7210-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (37.7/28.5 kN vs 41.5/33.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (37.7/28.5 kN vs 45.5/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-210-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (37.7/28.5 kN vs 65.5/61 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7210 BEP is the basic 50×90×20 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7210-BE-2RZP",
      "7210 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7210-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7210 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 37.7,
    "static_load_kN": 28.5,
    "fatigue_load_limit_kN": 1.22,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7210 BEP is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 50×90×20 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 50×90×20 mm (1.969×3.543×0.787 in), 20.0 mm radial section height, C 37.7 kN, C0 28.5 kN, Pu 1.22 kN.reference speed 9,000 r/min (thermal) and limiting speed 8,500 r/min (mechanical), catalogue mass 470 g. Selection figures for 7210 BEP: the static-to-dynamic ratio C0/C is 0.76, Pu 1.22 kN is about 3 % of C, and catalogue mass works out to roughly 9 g per millimetre of bore. Load balance: C0 28.5 kN against C 37.7 kN gives a 0.76 ratio, typical of a steep-angle axial-oriented design; Pu 1.22 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 90 over bore 50 is a 1.80× step for this size, and the 20 mm width gives a bore/width ratio of 2.50; use these ratios when housing space around the 50 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "centrifugal and vacuum pumps",
      "industrial transmissions",
      "printing cylinders and packaging shafts"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "At 50 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7210-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7210 BEP as the single basic pa66 execution; the other order numbers of the 7210 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7210-BEP?",
        "a": "7210 BEP measures 50 mm bore × 90 mm OD × 20 mm width (1.969 × 3.543 × 0.787 in), mass about 470 g. SKF 17000 ratings: C 37.7 kN, C0 28.5 kN, Pu 1.22 kN, reference speed 9,000 r/min (thermal) and limiting speed 8,500 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What minimum axial load does 7210-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7210-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7210-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (37.7/28.5 kN vs 41.5/33.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (37.7/28.5 kN vs 45.5/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-210-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (37.7/28.5 kN vs 65.5/61 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7210 BEP is the basic 50×90×20 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7210-BEP",
      "7210 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7210-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7210 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 40,
    "static_load_kN": 31,
    "fatigue_load_limit_kN": 1.32,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7210 BECBP is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 50×90×20 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 50×90×20 mm (1.969×3.543×0.787 in), 20.0 mm radial section height, C 40 kN, C0 31 kN, Pu 1.32 kN.reference speed 9,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), which coincide for this size, catalogue mass 470 g. Envelope economics: the 20 mm width over a 20.0 mm section yields 1.00 mm of ring width per section millimetre, and the bearing weighs 470 g for 40 kN of dynamic capacity — about 12 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 9,000 r/min while thermal balance under catalogue load sets the 9,000 r/min reference; at dm ≈ 70.0 mm the corresponding dn is approximately 630k mm·r/min. Bore-to-OD planning: OD 90 over bore 50 is a 1.80× step for this size, and the 20 mm width gives a bore/width ratio of 2.50; use these ratios when housing space around the 50 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "One 7210-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Fillet radii must clear the chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring — roughly k5 on a 50 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7210-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7210-BECBP?",
        "a": "7210 BECBP measures 50 mm bore × 90 mm OD × 20 mm width (1.969 × 3.543 × 0.787 in), mass about 470 g. SKF 17000 ratings: C 40 kN, C0 31 kN, Pu 1.32 kN, reference speed 9,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7210-BECBP?",
        "a": "With a rotating inner ring use roughly k5 on the 50 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7210-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 9,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7210-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7210-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (40/31 kN vs 45.5/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-210-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (40/31 kN vs 65.5/61 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7210 BEP is the basic 50×90×20 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7210-BECBP",
      "7210 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7210-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7210 BECBPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 40,
    "static_load_kN": 31,
    "fatigue_load_limit_kN": 1.32,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7210 BECBPH is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 50×90×20 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 50×90×20 mm (1.969×3.543×0.787 in), 20.0 mm radial section height, C 40 kN, C0 31 kN, Pu 1.32 kN.reference speed 9,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), which coincide for this size, catalogue mass 470 g. Envelope economics: the 20 mm width over a 20.0 mm section yields 1.00 mm of ring width per section millimetre, and the bearing weighs 470 g for 40 kN of dynamic capacity — about 12 g per rated kN. Selection figures for 7210 BECBPH: the static-to-dynamic ratio C0/C is 0.78, Pu 1.32 kN is about 3 % of C, and catalogue mass works out to roughly 9 g per millimetre of bore. Bore-to-OD planning: OD 90 over bore 50 is a 1.80× step for this size, and the 20 mm width gives a bore/width ratio of 2.50; use these ratios when housing space around the 50 mm shaft is the first constraint. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "centrifugal and vacuum pumps",
      "industrial transmissions",
      "printing cylinders and packaging shafts"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 50 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Fillet radii must clear the chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Fillet radii must clear the chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7210-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7210-BECBPH?",
        "a": "7210 BECBPH measures 50 mm bore × 90 mm OD × 20 mm width (1.969 × 3.543 × 0.787 in), mass about 470 g. SKF 17000 ratings: C 40 kN, C0 31 kN, Pu 1.32 kN, reference speed 9,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "Which fits should I use for 7210-BECBPH?",
        "a": "With a rotating inner ring use roughly k5 on the 50 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7210-BECBPH?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 9,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7210-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7210-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (40/31 kN vs 45.5/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-210-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (40/31 kN vs 65.5/61 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7210 BEP is the basic 50×90×20 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7210-BECBPH",
      "7210 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7210-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7210 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 40,
    "static_load_kN": 31,
    "fatigue_load_limit_kN": 1.32,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7210 BECBM is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 50×90×20 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 50×90×20 mm (1.969×3.543×0.787 in), 20.0 mm radial section height, C 40 kN, C0 31 kN, Pu 1.32 kN.reference speed 9,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), catalogue mass 470 g. The 1.32 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 40/31 kN ratings and 470 g mass this execution carries about 0.80 kN of C per millimetre of bore. Load balance: C0 31 kN against C 40 kN gives a 0.78 ratio, typical of a steep-angle axial-oriented design; Pu 1.32 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 90 over bore 50 is a 1.80× step for this size, and the 20 mm width gives a bore/width ratio of 2.50; use these ratios when housing space around the 50 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 50 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7210-BECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7210-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7210-BECBM?",
        "a": "7210 BECBM measures 50 mm bore × 90 mm OD × 20 mm width (1.969 × 3.543 × 0.787 in), mass about 470 g. SKF 17000 ratings: C 40 kN, C0 31 kN, Pu 1.32 kN, reference speed 9,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7210-BECBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 11,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7210-BECBM?",
        "a": "The 9,000 r/min reference (thermal) and 11,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7210-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7210-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (40/31 kN vs 45.5/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-210-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (40/31 kN vs 65.5/61 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7210 BEP is the basic 50×90×20 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7210-BECBM",
      "7210 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7210-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7210 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 41.5,
    "static_load_kN": 33.5,
    "fatigue_load_limit_kN": 1.4,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7210 BECBY is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 50×90×20 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 50×90×20 mm (1.969×3.543×0.787 in), 20.0 mm radial section height, C 41.5 kN, C0 33.5 kN, Pu 1.4 kN.reference speed 9,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), which coincide for this size, catalogue mass 470 g. Envelope economics: the 20 mm width over a 20.0 mm section yields 1.00 mm of ring width per section millimetre, and the bearing weighs 470 g for 41.5 kN of dynamic capacity — about 11 g per rated kN. Mass and section check: 470 g inside the 50×90×20 mm outline leaves a 20.0 mm radial section, and the 33.5 kN static rating is 0.81× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 90 over bore 50 is a 1.80× step for this size, and the 20 mm width gives a bore/width ratio of 2.50; use these ratios when housing space around the 50 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Fillet radii must clear the chamfer so the 20 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7210-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7210-BECBY?",
        "a": "7210 BECBY measures 50 mm bore × 90 mm OD × 20 mm width (1.969 × 3.543 × 0.787 in), mass about 470 g. SKF 17000 ratings: C 41.5 kN, C0 33.5 kN, Pu 1.4 kN, reference speed 9,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7210-BECBY?",
        "a": "The 9,000 r/min reference (thermal) and 9,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7210-BECBY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7210-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7210-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (41.5/33.5 kN vs 37.7/28.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (41.5/33.5 kN vs 37.7/28.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7210-ACCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 ACCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-210-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (41.5/33.5 kN vs 65.5/61 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7210 BEP shares the 50×90×20 mm angular-contact envelope, but catalogue C/C0 differ (41.5/33.5 kN vs 37.7/28.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7210-BECBY",
      "7210 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7210-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7210 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 45.5,
    "static_load_kN": 35.5,
    "fatigue_load_limit_kN": 1.5,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7210 ACCBM is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 50×90×20 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 50×90×20 mm (1.969×3.543×0.787 in), 20.0 mm radial section height, C 45.5 kN, C0 35.5 kN, Pu 1.5 kN.reference speed 9,500 r/min (thermal) and limiting speed 14,000 r/min (mechanical), catalogue mass 470 g. The 1.5 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 45.5/35.5 kN ratings and 470 g mass this execution carries about 0.91 kN of C per millimetre of bore. Load balance: C0 35.5 kN against C 45.5 kN gives a 0.78 ratio, typical of a steep-angle axial-oriented design; Pu 1.5 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 9,500 r/min against a 14,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.68. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "raceway staining from water in the lubricant during idle periods",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7210-ACCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Do not mix execution classes inside one set: a universally matchable ACCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Assign interference to the rotating ring — roughly k5 on a 50 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The 25° AC angle of 7210-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7210-ACCBM?",
        "a": "7210 ACCBM measures 50 mm bore × 90 mm OD × 20 mm width (1.969 × 3.543 × 0.787 in), mass about 470 g. SKF 17000 ratings: C 45.5 kN, C0 35.5 kN, Pu 1.5 kN, reference speed 9,500 r/min (thermal) and limiting speed 14,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7210-ACCBM?",
        "a": "With a rotating inner ring use roughly k5 on the 50 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7210-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7210-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (45.5/35.5 kN vs 37.7/28.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (45.5/35.5 kN vs 37.7/28.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (45.5/35.5 kN vs 40/31 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (45.5/35.5 kN vs 40/31 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (45.5/35.5 kN vs 40/31 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope with catalogue ratings within 10 %; 7210 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-210-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (45.5/35.5 kN vs 65.5/61 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7210 BEP shares the 50×90×20 mm angular-contact envelope, but catalogue C/C0 differ (45.5/35.5 kN vs 37.7/28.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7210-ACCBM",
      "7210 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7310-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7310 BE-2RZP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 68.9,
    "static_load_kN": 47.5,
    "fatigue_load_limit_kN": 2,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7310 BE-2RZP is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 50×110×27 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 50×110×27 mm (1.969×4.331×1.063 in), 30.0 mm radial section height, C 68.9 kN, C0 47.5 kN, Pu 2 kN.reference speed 7,500 r/min (thermal) and limiting speed 6,000 r/min (mechanical), catalogue mass 1200 g. Mass and section check: 1200 g inside the 50×110×27 mm outline leaves a 30.0 mm radial section, and the 47.5 kN static rating is 0.69× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 47.5 kN against C 68.9 kN gives a 0.69 ratio, typical of a steep-angle axial-oriented design; Pu 2 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 110 over bore 50 is a 2.20× step for this size, and the 27 mm width gives a bore/width ratio of 1.85; use these ratios when housing space around the 50 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BE-2RZP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Do not mix execution classes inside one set: a universally matchable BE-2RZP unit is ground for arbitrary pairing, a basic execution is not.",
      "Fillet radii must clear the chamfer so the 27 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "One 7310-BE-2RZP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7310-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7310-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7310-BE-2RZP?",
        "a": "7310 BE-2RZP measures 50 mm bore × 110 mm OD × 27 mm width (1.969 × 4.331 × 1.063 in), mass about 1200 g. SKF 17000 ratings: C 68.9 kN, C0 47.5 kN, Pu 2 kN, reference speed 7,500 r/min (thermal) and limiting speed 6,000 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7310-BE-2RZP?",
        "a": "With a rotating inner ring use roughly k5 on the 50 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7310-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7310-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (68.9/47.5 kN vs 78/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (68.9/47.5 kN vs 83/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-310-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (68.9/47.5 kN vs 118/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-310-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (68.9/47.5 kN vs 118/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7310 BECBP is the basic 50×110×27 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7310-BE-2RZP",
      "7310 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7310-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7310 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 75,
    "static_load_kN": 51,
    "fatigue_load_limit_kN": 2.16,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7310 BECBP is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 50×110×27 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 50×110×27 mm (1.969×4.331×1.063 in), 30.0 mm radial section height, C 75 kN, C0 51 kN, Pu 2.16 kN.reference speed 7,500 r/min (thermal) and limiting speed 8,000 r/min (mechanical), catalogue mass 1100 g. Sizing arithmetic on the 50 mm bore: 75 kN C divided by the 30.0 mm radial section height gives 2.5 kN per section millimetre; the 1100 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 1100 g inside the 50×110×27 mm outline leaves a 30.0 mm radial section, and the 51 kN static rating is 0.68× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 110 over bore 50 is a 2.20× step for this size, and the 27 mm width gives a bore/width ratio of 1.85; use these ratios when housing space around the 50 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 50 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the chamfer so the 27 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7310-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7310-BECBP?",
        "a": "7310 BECBP measures 50 mm bore × 110 mm OD × 27 mm width (1.969 × 4.331 × 1.063 in), mass about 1100 g. SKF 17000 ratings: C 75 kN, C0 51 kN, Pu 2.16 kN, reference speed 7,500 r/min (thermal) and limiting speed 8,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7310-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7310-BECBP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7310-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7310-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (75/51 kN vs 83/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-310-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (75/51 kN vs 118/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-310-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (75/51 kN vs 118/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7310 BECBP is the basic 50×110×27 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7310-BECBP",
      "7310 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7310-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7310 BEGAPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 75,
    "static_load_kN": 51,
    "fatigue_load_limit_kN": 2.16,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7310 BEGAPH is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 50×110×27 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 50×110×27 mm (1.969×4.331×1.063 in), 30.0 mm radial section height, C 75 kN, C0 51 kN, Pu 2.16 kN.reference speed 7,500 r/min (thermal) and limiting speed 8,000 r/min (mechanical), catalogue mass 1100 g. Mass and section check: 1100 g inside the 50×110×27 mm outline leaves a 30.0 mm radial section, and the 51 kN static rating is 0.68× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 8,000 r/min the mean pitch diameter dm ≈ 80.0 mm implies a dn value around 640k mm·r/min; the 7,500 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 110 over bore 50 is a 2.20× step for this size, and the 27 mm width gives a bore/width ratio of 1.85; use these ratios when housing space around the 50 mm shaft is the first constraint. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "At 50 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "One 7310-BEGAPH locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7310-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7310-BEGAPH?",
        "a": "7310 BEGAPH measures 50 mm bore × 110 mm OD × 27 mm width (1.969 × 4.331 × 1.063 in), mass about 1100 g. SKF 17000 ratings: C 75 kN, C0 51 kN, Pu 2.16 kN, reference speed 7,500 r/min (thermal) and limiting speed 8,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7310-BEGAPH?",
        "a": "With a rotating inner ring use roughly k5 on the 50 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7310-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7310-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (75/51 kN vs 83/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-310-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (75/51 kN vs 118/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-310-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (75/51 kN vs 118/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7310 BECBP is the basic 50×110×27 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7310-BEGAPH",
      "7310 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7310-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7310 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 75,
    "static_load_kN": 51,
    "fatigue_load_limit_kN": 2.16,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7310 BECBM is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 50×110×27 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 50×110×27 mm (1.969×4.331×1.063 in), 30.0 mm radial section height, C 75 kN, C0 51 kN, Pu 2.16 kN.reference speed 7,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 1100 g. Selection figures for 7310 BECBM: the static-to-dynamic ratio C0/C is 0.68, Pu 2.16 kN is about 3 % of C, and catalogue mass works out to roughly 22 g per millimetre of bore. At the printed limiting speed of 10,000 r/min the mean pitch diameter dm ≈ 80.0 mm implies a dn value around 800k mm·r/min; the 7,500 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 110 over bore 50 is a 2.20× step for this size, and the 27 mm width gives a bore/width ratio of 1.85; use these ratios when housing space around the 50 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 50 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Fillet radii must clear the chamfer so the 27 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Fillet radii must clear the chamfer so the 27 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7310-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7310-BECBM?",
        "a": "7310 BECBM measures 50 mm bore × 110 mm OD × 27 mm width (1.969 × 4.331 × 1.063 in), mass about 1100 g. SKF 17000 ratings: C 75 kN, C0 51 kN, Pu 2.16 kN, reference speed 7,500 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7310-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7310-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7310-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (75/51 kN vs 83/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-310-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (75/51 kN vs 118/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-310-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (75/51 kN vs 118/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7310 BECBP is the basic 50×110×27 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7310-BECBM",
      "7310 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7310-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7310 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 78,
    "static_load_kN": 56,
    "fatigue_load_limit_kN": 2.36,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7310 BECBY is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 50×110×27 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 50×110×27 mm (1.969×4.331×1.063 in), 30.0 mm radial section height, C 78 kN, C0 56 kN, Pu 2.36 kN.reference speed 7,500 r/min (thermal) and limiting speed 8,000 r/min (mechanical), catalogue mass 1150 g. Load balance: C0 56 kN against C 78 kN gives a 0.72 ratio, typical of a steep-angle axial-oriented design; Pu 2.36 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 1150 g inside the 50×110×27 mm outline leaves a 30.0 mm radial section, and the 56 kN static rating is 0.72× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 110 over bore 50 is a 2.20× step for this size, and the 27 mm width gives a bore/width ratio of 1.85; use these ratios when housing space around the 50 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "At 50 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7310-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7310-BECBY?",
        "a": "7310 BECBY measures 50 mm bore × 110 mm OD × 27 mm width (1.969 × 4.331 × 1.063 in), mass about 1150 g. SKF 17000 ratings: C 78 kN, C0 56 kN, Pu 2.36 kN, reference speed 7,500 r/min (thermal) and limiting speed 8,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Can one 7310-BECBY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7310-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7310-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7310-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (78/56 kN vs 68.9/47.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310-ACCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 ACCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-310-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (78/56 kN vs 118/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-310-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (78/56 kN vs 118/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7310 BECBP is the basic 50×110×27 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7310-BECBY",
      "7310 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7310-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7310 ACCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 83,
    "static_load_kN": 57,
    "fatigue_load_limit_kN": 2.4,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7310 ACCBM is SKF's 50 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 25° (AC) contact angle, 50×110×27 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 50×110×27 mm (1.969×4.331×1.063 in), 30.0 mm radial section height, C 83 kN, C0 57 kN, Pu 2.4 kN.reference speed 8,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical), catalogue mass 1100 g. Envelope economics: the 27 mm width over a 30.0 mm section yields 0.90 mm of ring width per section millimetre, and the bearing weighs 1100 g for 83 kN of dynamic capacity — about 13 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 12,000 r/min while thermal balance under catalogue load sets the 8,000 r/min reference; at dm ≈ 80.0 mm the corresponding dn is approximately 960k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 8,000 r/min against a 12,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.67. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable ACCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "At 50 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 0,55 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The 25° AC angle of 7310-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7310-ACCBM?",
        "a": "7310 ACCBM measures 50 mm bore × 110 mm OD × 27 mm width (1.969 × 4.331 × 1.063 in), mass about 1100 g. SKF 17000 ratings: C 83 kN, C0 57 kN, Pu 2.4 kN, reference speed 8,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7310-ACCBM?",
        "a": "The 8,000 r/min reference (thermal) and 12,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7310-ACCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 25° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7310-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7310-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (83/57 kN vs 68.9/47.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (83/57 kN vs 75/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (83/57 kN vs 75/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (83/57 kN vs 75/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; 7310 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-310-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (83/57 kN vs 118/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-310-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (83/57 kN vs 118/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7310 BECBP shares the 50×110×27 mm angular-contact envelope, but catalogue C/C0 differ (83/57 kN vs 75/51 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7310-ACCBM",
      "7310 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7211-BE-2RZP",
    "brand": "SKF",
    "manufacturer_designation": "7211 BE-2RZP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 46.2,
    "static_load_kN": 36,
    "fatigue_load_limit_kN": 1.53,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7211 BE-2RZP is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 55×100×21 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage. Envelope 55×100×21 mm (2.165×3.937×0.827 in), 22.5 mm radial section height, C 46.2 kN, C0 36 kN, Pu 1.53 kN.reference speed 8,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 620 g. Load balance: C0 36 kN against C 46.2 kN gives a 0.78 ratio, typical of a steep-angle axial-oriented design; Pu 1.53 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 620 g inside the 55×100×21 mm outline leaves a 22.5 mm radial section, and the 36 kN static rating is 0.78× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 100 over bore 55 is a 1.82× step for this size, and the 21 mm width gives a bore/width ratio of 2.62; use these ratios when housing space around the 55 mm shaft is the first constraint. Sealing note: the two non-contact NBR -2RZ seals run in recessed grooves without touching the inner ring, so drag and speed loss stay small while the standard grease fill is retained and coarse dust is excluded; they are not lip-contact seals, so pressure washing and fine slurry still require external housing seals. The uncapped BECBP/BEP executions are the open counterparts.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "grease ageing inside the non-contact-sealed cavity after long service with no relubrication access",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "At 55 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "At 55 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7211-BE-2RZP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "The non-contact -2RZ seals of 7211-BE-2RZP add little drag but are not contact seals; in wet or fine-dust duty retain external sealing at the housing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7211-BE-2RZP?",
        "a": "7211 BE-2RZP measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 620 g. SKF 17000 ratings: C 46.2 kN, C0 36 kN, Pu 1.53 kN, reference speed 8,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the BE-2RZP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. -2RZ marks non-contact NBR seals on both sides riding in recessed grooves: they keep contamination and the standard grease fill in without lip drag, and P again denotes the PA66 cage."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7211-BE-2RZP?",
        "a": "With a rotating inner ring use roughly k5 on the 55 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "7211-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 51/42.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 57/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7211 BEP is the basic 55×100×21 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7211-BE-2RZP",
      "7211 BE-2RZP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7211-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7211 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 46.2,
    "static_load_kN": 36,
    "fatigue_load_limit_kN": 1.53,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7211 BEP is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 55×100×21 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 55×100×21 mm (2.165×3.937×0.827 in), 22.5 mm radial section height, C 46.2 kN, C0 36 kN, Pu 1.53 kN.reference speed 8,000 r/min (thermal) and limiting speed 7,500 r/min (mechanical), catalogue mass 620 g. Load balance: C0 36 kN against C 46.2 kN gives a 0.78 ratio, typical of a steep-angle axial-oriented design; Pu 1.53 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 620 g inside the 55×100×21 mm outline leaves a 22.5 mm radial section, and the 36 kN static rating is 0.78× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 100 over bore 55 is a 1.82× step for this size, and the 21 mm width gives a bore/width ratio of 2.62; use these ratios when housing space around the 55 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 55 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7211-BEP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7211-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7211 BEP as the single basic pa66 execution; the other order numbers of the 7211 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7211-BEP?",
        "a": "7211 BEP measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 620 g. SKF 17000 ratings: C 46.2 kN, C0 36 kN, Pu 1.53 kN, reference speed 8,000 r/min (thermal) and limiting speed 7,500 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Can one 7211-BEP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7211-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7211-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BE-2RZP is the glass-fibre PA66 cage, non-contact NBR seals (-2RZ) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 51/42.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 57/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (46.2/36 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7211 BEP is the basic 55×100×21 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7211-BEP",
      "7211 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7211-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7211 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 49,
    "static_load_kN": 40,
    "fatigue_load_limit_kN": 1.66,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7211 BECBP is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 55×100×21 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 55×100×21 mm (2.165×3.937×0.827 in), 22.5 mm radial section height, C 49 kN, C0 40 kN, Pu 1.66 kN.reference speed 8,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical), which coincide for this size, catalogue mass 620 g. The 1.66 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 49/40 kN ratings and 620 g mass this execution carries about 0.89 kN of C per millimetre of bore. Load balance: C0 40 kN against C 49 kN gives a 0.82 ratio, typical of a steep-angle axial-oriented design; Pu 1.66 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 100 over bore 55 is a 1.82× step for this size, and the 21 mm width gives a bore/width ratio of 2.62; use these ratios when housing space around the 55 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Assign interference to the rotating ring — roughly k5 on a 55 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7211-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7211-BECBP?",
        "a": "7211 BECBP measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 620 g. SKF 17000 ratings: C 49 kN, C0 40 kN, Pu 1.66 kN, reference speed 8,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7211-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 8,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7211-BECBP?",
        "a": "The 8,000 r/min reference (thermal) and 8,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7211-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 57/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7211 BEP shares the 55×100×21 mm angular-contact envelope, but catalogue C/C0 differ (49/40 kN vs 46.2/36 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7211-BECBP",
      "7211 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7211-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7211 BECBPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 49,
    "static_load_kN": 40,
    "fatigue_load_limit_kN": 1.66,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7211 BECBPH is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 55×100×21 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 55×100×21 mm (2.165×3.937×0.827 in), 22.5 mm radial section height, C 49 kN, C0 40 kN, Pu 1.66 kN.reference speed 8,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical), which coincide for this size, catalogue mass 620 g. Load balance: C0 40 kN against C 49 kN gives a 0.82 ratio, typical of a steep-angle axial-oriented design; Pu 1.66 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 8,000 r/min while thermal balance under catalogue load sets the 8,000 r/min reference; at dm ≈ 77.5 mm the corresponding dn is approximately 620k mm·r/min. Bore-to-OD planning: OD 100 over bore 55 is a 1.82× step for this size, and the 21 mm width gives a bore/width ratio of 2.62; use these ratios when housing space around the 55 mm shaft is the first constraint. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Assign interference to the rotating ring — roughly k5 on a 55 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7211-BECBPH of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Fillet radii must clear the chamfer so the 21 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7211-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7211-BECBPH?",
        "a": "7211 BECBPH measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 620 g. SKF 17000 ratings: C 49 kN, C0 40 kN, Pu 1.66 kN, reference speed 8,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7211-BECBPH?",
        "a": "With a rotating inner ring use roughly k5 on the 55 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7211-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 57/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7211 BEP shares the 55×100×21 mm angular-contact envelope, but catalogue C/C0 differ (49/40 kN vs 46.2/36 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7211-BECBPH",
      "7211 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7211-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7211 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 49,
    "static_load_kN": 40,
    "fatigue_load_limit_kN": 1.66,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7211 BECBM is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 55×100×21 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 55×100×21 mm (2.165×3.937×0.827 in), 22.5 mm radial section height, C 49 kN, C0 40 kN, Pu 1.66 kN.reference speed 8,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 620 g. Envelope economics: the 21 mm width over a 22.5 mm section yields 0.93 mm of ring width per section millimetre, and the bearing weighs 620 g for 49 kN of dynamic capacity — about 13 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 10,000 r/min while thermal balance under catalogue load sets the 8,000 r/min reference; at dm ≈ 77.5 mm the corresponding dn is approximately 775k mm·r/min. Bore-to-OD planning: OD 100 over bore 55 is a 1.82× step for this size, and the 21 mm width gives a bore/width ratio of 2.62; use these ratios when housing space around the 55 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "One 7211-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "One 7211-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "At 55 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7211-BECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7211-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7211-BECBM?",
        "a": "7211 BECBM measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 620 g. SKF 17000 ratings: C 49 kN, C0 40 kN, Pu 1.66 kN, reference speed 8,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7211-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7211-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 57/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (49/40 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7211 BEP shares the 55×100×21 mm angular-contact envelope, but catalogue C/C0 differ (49/40 kN vs 46.2/36 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7211-BECBM",
      "7211 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7211-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7211 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 51,
    "static_load_kN": 42.5,
    "fatigue_load_limit_kN": 1.8,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7211 BECBY is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 55×100×21 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 55×100×21 mm (2.165×3.937×0.827 in), 22.5 mm radial section height, C 51 kN, C0 42.5 kN, Pu 1.8 kN.reference speed 8,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical), which coincide for this size, catalogue mass 620 g. Mass and section check: 620 g inside the 55×100×21 mm outline leaves a 22.5 mm radial section, and the 42.5 kN static rating is 0.83× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 42.5 kN against C 51 kN gives a 0.83 ratio, typical of a steep-angle axial-oriented design; Pu 1.8 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 100 over bore 55 is a 1.82× step for this size, and the 21 mm width gives a bore/width ratio of 2.62; use these ratios when housing space around the 55 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "One 7211-BECBY locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7211-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7211-BECBY?",
        "a": "7211 BECBY measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 620 g. SKF 17000 ratings: C 51 kN, C0 42.5 kN, Pu 1.8 kN, reference speed 8,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which grease and fill for 7211-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 8,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7211-BECBY?",
        "a": "The 8,000 r/min reference (thermal) and 8,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7211-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7211-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (51/42.5 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (51/42.5 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; 7211 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (51/42.5 kN vs 57/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (51/42.5 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (51/42.5 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7211 BEP shares the 55×100×21 mm angular-contact envelope, but catalogue C/C0 differ (51/42.5 kN vs 46.2/36 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7211-BECBY",
      "7211 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7211-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7211 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 57,
    "static_load_kN": 45,
    "fatigue_load_limit_kN": 1.9,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7211 ACCBM is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 55×100×21 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 55×100×21 mm (2.165×3.937×0.827 in), 22.5 mm radial section height, C 57 kN, C0 45 kN, Pu 1.9 kN.reference speed 8,500 r/min (thermal) and limiting speed 12,000 r/min (mechanical), catalogue mass 620 g. Selection figures for 7211 ACCBM: the static-to-dynamic ratio C0/C is 0.79, Pu 1.9 kN is about 3 % of C, and catalogue mass works out to roughly 11 g per millimetre of bore. At the printed limiting speed of 12,000 r/min the mean pitch diameter dm ≈ 77.5 mm implies a dn value around 930k mm·r/min; the 8,500 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 8,500 r/min against a 12,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.71. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills",
      "test-rig and balancing-machine shafts"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "brinelling from pressing the ring home through the balls or from static overload",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "At 55 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Fillet radii must clear the chamfer so the 21 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring — roughly k5 on a 55 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The 25° AC angle of 7211-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7211-ACCBM?",
        "a": "7211 ACCBM measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 620 g. SKF 17000 ratings: C 57 kN, C0 45 kN, Pu 1.9 kN, reference speed 8,500 r/min (thermal) and limiting speed 12,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7211-ACCBM?",
        "a": "With a rotating inner ring use roughly k5 on the 55 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7211-ACCBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 12,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7211-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (57/45 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (57/45 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (57/45 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (57/45 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (57/45 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (57/45 kN vs 51/42.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (57/45 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (57/45 kN vs 85/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7211 BEP shares the 55×100×21 mm angular-contact envelope, but catalogue C/C0 differ (57/45 kN vs 46.2/36 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7211-ACCBM",
      "7211 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7311-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7311 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 79.3,
    "static_load_kN": 55,
    "fatigue_load_limit_kN": 2.32,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 1400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7311 BEP is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 55×120×29 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 55×120×29 mm (2.165×4.724×1.142 in), 32.5 mm radial section height, C 79.3 kN, C0 55 kN, Pu 2.32 kN.reference speed 7,000 r/min (thermal) and limiting speed 6,700 r/min (mechanical), catalogue mass 1400 g. Envelope economics: the 29 mm width over a 32.5 mm section yields 0.89 mm of ring width per section millimetre, and the bearing weighs 1400 g for 79.3 kN of dynamic capacity — about 18 g per rated kN. Mass and section check: 1400 g inside the 55×120×29 mm outline leaves a 32.5 mm radial section, and the 55 kN static rating is 0.69× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 120 over bore 55 is a 2.18× step for this size, and the 29 mm width gives a bore/width ratio of 1.90; use these ratios when housing space around the 55 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Assign interference to the rotating ring — roughly k5 on a 55 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Assign interference to the rotating ring — roughly k5 on a 55 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the chamfer so the 29 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7311-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7311 BEP as the single basic pa66 execution; the other order numbers of the 7311 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7311-BEP?",
        "a": "7311 BEP measures 55 mm bore × 120 mm OD × 29 mm width (2.165 × 4.724 × 1.142 in), mass about 1400 g. SKF 17000 ratings: C 79.3 kN, C0 55 kN, Pu 2.32 kN, reference speed 7,000 r/min (thermal) and limiting speed 6,700 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7311-BEP?",
        "a": "The 7,000 r/min reference (thermal) and 6,700 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7311-BEP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7311-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (79.3/55 kN vs 90/65.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (79.3/55 kN vs 96.5/67 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-311-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (79.3/55 kN vs 137/118 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-311-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (79.3/55 kN vs 137/118 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7311 BEP is the basic 55×120×29 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7311-BEP",
      "7311 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7311-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7311 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 85,
    "static_load_kN": 60,
    "fatigue_load_limit_kN": 2.55,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 1400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7311 BECBP is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 55×120×29 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 55×120×29 mm (2.165×4.724×1.142 in), 32.5 mm radial section height, C 85 kN, C0 60 kN, Pu 2.55 kN.reference speed 7,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), which coincide for this size, catalogue mass 1400 g. Selection figures for 7311 BECBP: the static-to-dynamic ratio C0/C is 0.71, Pu 2.55 kN is about 3 % of C, and catalogue mass works out to roughly 25 g per millimetre of bore. At the printed limiting speed of 7,000 r/min the mean pitch diameter dm ≈ 87.5 mm implies a dn value around 613k mm·r/min; the 7,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 120 over bore 55 is a 2.18× step for this size, and the 29 mm width gives a bore/width ratio of 1.90; use these ratios when housing space around the 55 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps",
      "centrifugal and vacuum pumps"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 55 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Fillet radii must clear the chamfer so the 29 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "One 7311-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7311-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7311-BECBP?",
        "a": "7311 BECBP measures 55 mm bore × 120 mm OD × 29 mm width (2.165 × 4.724 × 1.142 in), mass about 1400 g. SKF 17000 ratings: C 85 kN, C0 60 kN, Pu 2.55 kN, reference speed 7,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7311-BECBP?",
        "a": "The 7,000 r/min reference (thermal) and 7,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7311-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7311-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (85/60 kN vs 96.5/67 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-311-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (85/60 kN vs 137/118 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-311-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (85/60 kN vs 137/118 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7311 BEP is the basic 55×120×29 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7311-BECBP",
      "7311 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7311-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7311 BECBPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 85,
    "static_load_kN": 60,
    "fatigue_load_limit_kN": 2.55,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 1400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7311 BECBPH is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 55×120×29 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 55×120×29 mm (2.165×4.724×1.142 in), 32.5 mm radial section height, C 85 kN, C0 60 kN, Pu 2.55 kN.reference speed 7,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), which coincide for this size, catalogue mass 1400 g. Selection figures for 7311 BECBPH: the static-to-dynamic ratio C0/C is 0.71, Pu 2.55 kN is about 3 % of C, and catalogue mass works out to roughly 25 g per millimetre of bore. Envelope economics: the 29 mm width over a 32.5 mm section yields 0.89 mm of ring width per section millimetre, and the bearing weighs 1400 g for 85 kN of dynamic capacity — about 16 g per rated kN. Bore-to-OD planning: OD 120 over bore 55 is a 2.18× step for this size, and the 29 mm width gives a bore/width ratio of 1.90; use these ratios when housing space around the 55 mm shaft is the first constraint. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "test-rig and balancing-machine shafts",
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "brinelling from pressing the ring home through the balls or from static overload",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "At 55 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7311-BECBPH locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7311-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7311-BECBPH?",
        "a": "7311 BECBPH measures 55 mm bore × 120 mm OD × 29 mm width (2.165 × 4.724 × 1.142 in), mass about 1400 g. SKF 17000 ratings: C 85 kN, C0 60 kN, Pu 2.55 kN, reference speed 7,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7311-BECBPH?",
        "a": "The 7,000 r/min reference (thermal) and 7,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7311-BECBPH take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7311-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (85/60 kN vs 96.5/67 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-311-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (85/60 kN vs 137/118 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-311-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (85/60 kN vs 137/118 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7311 BEP is the basic 55×120×29 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7311-BECBPH",
      "7311 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7311-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7311 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 85,
    "static_load_kN": 60,
    "fatigue_load_limit_kN": 2.55,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 1400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7311 BECBM is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 55×120×29 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 55×120×29 mm (2.165×4.724×1.142 in), 32.5 mm radial section height, C 85 kN, C0 60 kN, Pu 2.55 kN.reference speed 7,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), catalogue mass 1400 g. Sizing arithmetic on the 55 mm bore: 85 kN C divided by the 32.5 mm radial section height gives 2.6 kN per section millimetre; the 1400 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 1400 g inside the 55×120×29 mm outline leaves a 32.5 mm radial section, and the 60 kN static rating is 0.71× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 120 over bore 55 is a 2.18× step for this size, and the 29 mm width gives a bore/width ratio of 1.90; use these ratios when housing space around the 55 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "machine-tool spindles and spindle units",
      "servo drives and precision gearboxes",
      "gear pumps and screw-type pumps"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "One 7311-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7311-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7311-BECBM?",
        "a": "7311 BECBM measures 55 mm bore × 120 mm OD × 29 mm width (2.165 × 4.724 × 1.142 in), mass about 1400 g. SKF 17000 ratings: C 85 kN, C0 60 kN, Pu 2.55 kN, reference speed 7,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7311-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7311-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7311-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (85/60 kN vs 96.5/67 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-311-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (85/60 kN vs 137/118 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-311-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (85/60 kN vs 137/118 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7311 BEP is the basic 55×120×29 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7311-BECBM",
      "7311 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7311-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7311 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 90,
    "static_load_kN": 65.5,
    "fatigue_load_limit_kN": 2.75,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 1400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7311 BECBY is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 55×120×29 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 55×120×29 mm (2.165×4.724×1.142 in), 32.5 mm radial section height, C 90 kN, C0 65.5 kN, Pu 2.75 kN.reference speed 7,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), which coincide for this size, catalogue mass 1400 g. Selection figures for 7311 BECBY: the static-to-dynamic ratio C0/C is 0.73, Pu 2.75 kN is about 3 % of C, and catalogue mass works out to roughly 25 g per millimetre of bore. Load balance: C0 65.5 kN against C 90 kN gives a 0.73 ratio, typical of a steep-angle axial-oriented design; Pu 2.75 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 120 over bore 55 is a 2.18× step for this size, and the 29 mm width gives a bore/width ratio of 1.90; use these ratios when housing space around the 55 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "centrifugal and vacuum pumps",
      "industrial transmissions",
      "printing cylinders and packaging shafts"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 29 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7311-BECBY of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7311-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7311-BECBY?",
        "a": "7311 BECBY measures 55 mm bore × 120 mm OD × 29 mm width (2.165 × 4.724 × 1.142 in), mass about 1400 g. SKF 17000 ratings: C 90 kN, C0 65.5 kN, Pu 2.75 kN, reference speed 7,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What minimum axial load does 7311-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7311-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7311-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (90/65.5 kN vs 79.3/55 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311-ACCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 ACCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-311-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (90/65.5 kN vs 137/118 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-311-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (90/65.5 kN vs 137/118 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7311 BEP shares the 55×120×29 mm angular-contact envelope, but catalogue C/C0 differ (90/65.5 kN vs 79.3/55 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7311-BECBY",
      "7311 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7311-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7311 ACCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 96.5,
    "static_load_kN": 67,
    "fatigue_load_limit_kN": 2.85,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 1400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7311 ACCBM is SKF's 55 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 25° (AC) contact angle, 55×120×29 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 55×120×29 mm (2.165×4.724×1.142 in), 32.5 mm radial section height, C 96.5 kN, C0 67 kN, Pu 2.85 kN.reference speed 7,500 r/min (thermal) and limiting speed 11,000 r/min (mechanical), catalogue mass 1400 g. Sizing arithmetic on the 55 mm bore: 96.5 kN C divided by the 32.5 mm radial section height gives 3.0 kN per section millimetre; the 1400 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 1400 g inside the 55×120×29 mm outline leaves a 32.5 mm radial section, and the 67 kN static rating is 0.69× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 7,500 r/min against a 11,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.68. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "industrial transmissions",
      "printing cylinders and packaging shafts",
      "belt-driven internal-grinding quills"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "fretting corrosion on a loose rotating shaft seat",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "One 7311-ACCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Assign interference to the rotating ring — roughly k5 on a 55 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The 25° AC angle of 7311-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7311-ACCBM?",
        "a": "7311 ACCBM measures 55 mm bore × 120 mm OD × 29 mm width (2.165 × 4.724 × 1.142 in), mass about 1400 g. SKF 17000 ratings: C 96.5 kN, C0 67 kN, Pu 2.85 kN, reference speed 7,500 r/min (thermal) and limiting speed 11,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7311-ACCBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 11,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7311-ACCBM?",
        "a": "The 7,500 r/min reference (thermal) and 11,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7311-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7311-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (96.5/67 kN vs 79.3/55 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (96.5/67 kN vs 85/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (96.5/67 kN vs 85/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (96.5/67 kN vs 85/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; 7311 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-311-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (96.5/67 kN vs 137/118 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-311-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (96.5/67 kN vs 137/118 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7311 BEP shares the 55×120×29 mm angular-contact envelope, but catalogue C/C0 differ (96.5/67 kN vs 79.3/55 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7311-ACCBM",
      "7311 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7212-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7212 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 57.2,
    "static_load_kN": 45.5,
    "fatigue_load_limit_kN": 1.93,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7212 BEP is SKF's 60 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 60×110×22 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 60×110×22 mm (2.362×4.331×0.866 in), 25.0 mm radial section height, C 57.2 kN, C0 45.5 kN, Pu 1.93 kN.reference speed 7,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), which coincide for this size, catalogue mass 800 g. At the printed limiting speed of 7,000 r/min the mean pitch diameter dm ≈ 85.0 mm implies a dn value around 595k mm·r/min; the 7,000 r/min reference speed is the thermal-planning figure under catalogue load. The 1.93 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 57.2/45.5 kN ratings and 800 g mass this execution carries about 0.95 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 7,000 r/min against a 7,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "centrifuge and separator drives",
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "edge loading from shaft deflection or housing misalignment",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7212-BEP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Assign interference to the rotating ring — roughly k5 on a 60 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7212-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7212 BEP as the single basic pa66 execution; the other order numbers of the 7212 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7212-BEP?",
        "a": "7212 BEP measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 800 g. SKF 17000 ratings: C 57.2 kN, C0 45.5 kN, Pu 1.93 kN, reference speed 7,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What minimum axial load does 7212-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7212-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7212-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (57.2/45.5 kN vs 69.5/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (57.2/45.5 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (57.2/45.5 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (57.2/45.5 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7212 BEP is the basic 60×110×22 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7212-BEP",
      "7212 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7212-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7212 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 61,
    "static_load_kN": 50,
    "fatigue_load_limit_kN": 2.12,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7212 BECBP is SKF's 60 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 60×110×22 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 60×110×22 mm (2.362×4.331×0.866 in), 25.0 mm radial section height, C 61 kN, C0 50 kN, Pu 2.12 kN.reference speed 7,000 r/min (thermal) and limiting speed 7,500 r/min (mechanical), catalogue mass 800 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 7,500 r/min while thermal balance under catalogue load sets the 7,000 r/min reference; at dm ≈ 85.0 mm the corresponding dn is approximately 638k mm·r/min. Selection figures for 7212 BECBP: the static-to-dynamic ratio C0/C is 0.82, Pu 2.12 kN is about 3 % of C, and catalogue mass works out to roughly 13 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 7,000 r/min against a 7,500 r/min limiting speed, i.e. a reference-to-limit ratio of 0.93. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives",
      "heavy feed and take-up rolls"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "At 60 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Assign interference to the rotating ring — roughly k5 on a 60 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7212-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7212-BECBP?",
        "a": "7212 BECBP measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 800 g. SKF 17000 ratings: C 61 kN, C0 50 kN, Pu 2.12 kN, reference speed 7,000 r/min (thermal) and limiting speed 7,500 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7212-BECBP?",
        "a": "With a rotating inner ring use roughly k5 on the 60 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7212-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 7,500 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7212-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7212-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 69.5/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7212 BEP is the basic 60×110×22 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7212-BECBP",
      "7212 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7212-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7212 BECBPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 61,
    "static_load_kN": 50,
    "fatigue_load_limit_kN": 2.12,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7212 BECBPH is SKF's 60 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 60×110×22 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 60×110×22 mm (2.362×4.331×0.866 in), 25.0 mm radial section height, C 61 kN, C0 50 kN, Pu 2.12 kN.reference speed 7,000 r/min (thermal) and limiting speed 7,500 r/min (mechanical), catalogue mass 800 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 7,500 r/min while thermal balance under catalogue load sets the 7,000 r/min reference; at dm ≈ 85.0 mm the corresponding dn is approximately 638k mm·r/min. At the printed limiting speed of 7,500 r/min the mean pitch diameter dm ≈ 85.0 mm implies a dn value around 638k mm·r/min; the 7,000 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 7,000 r/min against a 7,500 r/min limiting speed, i.e. a reference-to-limit ratio of 0.93. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Assign interference to the rotating ring — roughly k5 on a 60 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the chamfer so the 22 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7212-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7212-BECBPH?",
        "a": "7212 BECBPH measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 800 g. SKF 17000 ratings: C 61 kN, C0 50 kN, Pu 2.12 kN, reference speed 7,000 r/min (thermal) and limiting speed 7,500 r/min (mechanical)."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "What minimum axial load does 7212-BECBPH need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7212-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7212-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 69.5/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7212 BEP is the basic 60×110×22 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7212-BECBPH",
      "7212 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7212-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7212 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 61,
    "static_load_kN": 50,
    "fatigue_load_limit_kN": 2.12,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7212 BECBY is SKF's 60 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 60×110×22 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 60×110×22 mm (2.362×4.331×0.866 in), 25.0 mm radial section height, C 61 kN, C0 50 kN, Pu 2.12 kN.reference speed 7,000 r/min (thermal) and limiting speed 7,500 r/min (mechanical), catalogue mass 800 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 7,500 r/min while thermal balance under catalogue load sets the 7,000 r/min reference; at dm ≈ 85.0 mm the corresponding dn is approximately 638k mm·r/min. Sizing arithmetic on the 60 mm bore: 61 kN C divided by the 25.0 mm radial section height gives 2.4 kN per section millimetre; the 800 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 7,000 r/min against a 7,500 r/min limiting speed, i.e. a reference-to-limit ratio of 0.93. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7212-BECBY of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Assign interference to the rotating ring — roughly k5 on a 60 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "One 7212-BECBY locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7212-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7212-BECBY?",
        "a": "7212 BECBY measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 800 g. SKF 17000 ratings: C 61 kN, C0 50 kN, Pu 2.12 kN, reference speed 7,000 r/min (thermal) and limiting speed 7,500 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7212-BECBY?",
        "a": "The 7,000 r/min reference (thermal) and 7,500 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7212-BECBY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7212-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7212-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 69.5/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7212 BEP is the basic 60×110×22 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7212-BECBY",
      "7212 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7212-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7212 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 61,
    "static_load_kN": 50,
    "fatigue_load_limit_kN": 2.12,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 9500,
    "max_rpm": 9500,
    "weight_g": 800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7212 BECBM is SKF's 60 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 60×110×22 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 60×110×22 mm (2.362×4.331×0.866 in), 25.0 mm radial section height, C 61 kN, C0 50 kN, Pu 2.12 kN.reference speed 7,000 r/min (thermal) and limiting speed 9,500 r/min (mechanical), catalogue mass 800 g. Mass and section check: 800 g inside the 60×110×22 mm outline leaves a 25.0 mm radial section, and the 50 kN static rating is 0.82× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 2.12 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 61/50 kN ratings and 800 g mass this execution carries about 1.02 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 7,000 r/min against a 9,500 r/min limiting speed, i.e. a reference-to-limit ratio of 0.74. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Fillet radii must clear the chamfer so the 22 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7212-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7212-BECBM?",
        "a": "7212 BECBM measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 800 g. SKF 17000 ratings: C 61 kN, C0 50 kN, Pu 2.12 kN, reference speed 7,000 r/min (thermal) and limiting speed 9,500 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7212-BECBM?",
        "a": "With a rotating inner ring use roughly k5 on the 60 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7212-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7212-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; 7212 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 69.5/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (61/50 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7212 BEP is the basic 60×110×22 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7212-BECBM",
      "7212 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7212-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7212 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 56,
    "fatigue_load_limit_kN": 2.36,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7212 ACCBM is SKF's 60 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 60×110×22 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 60×110×22 mm (2.362×4.331×0.866 in), 25.0 mm radial section height, C 69.5 kN, C0 56 kN, Pu 2.36 kN.reference speed 8,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), catalogue mass 800 g. Load balance: C0 56 kN against C 69.5 kN gives a 0.81 ratio, typical of a steep-angle axial-oriented design; Pu 2.36 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 60 mm bore: 69.5 kN C divided by the 25.0 mm radial section height gives 2.8 kN per section millimetre; the 800 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 110 over bore 60 is a 1.83× step for this size, and the 22 mm width gives a bore/width ratio of 2.73; use these ratios when housing space around the 60 mm shaft is the first constraint. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives",
      "heavy feed and take-up rolls"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Do not mix execution classes inside one set: a universally matchable ACCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "At 60 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The 25° AC angle of 7212-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7212-ACCBM?",
        "a": "7212 ACCBM measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 800 g. SKF 17000 ratings: C 69.5 kN, C0 56 kN, Pu 2.36 kN, reference speed 8,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7212-ACCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 25° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7212-ACCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7212-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7212-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (69.5/56 kN vs 57.2/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (69.5/56 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (69.5/56 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (69.5/56 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (69.5/56 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (69.5/56 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (69.5/56 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (69.5/56 kN vs 96.5/93 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7212 BEP shares the 60×110×22 mm angular-contact envelope, but catalogue C/C0 differ (69.5/56 kN vs 57.2/45.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7212-ACCBM",
      "7212 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7312-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7312 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 95.6,
    "static_load_kN": 69.5,
    "fatigue_load_limit_kN": 3,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7312 BEP is SKF's 60 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 60×130×31 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 60×130×31 mm (2.362×5.118×1.22 in), 35.0 mm radial section height, C 95.6 kN, C0 69.5 kN, Pu 3 kN.reference speed 6,300 r/min (thermal) and limiting speed 6,000 r/min (mechanical), catalogue mass 1750 g. Sizing arithmetic on the 60 mm bore: 95.6 kN C divided by the 35.0 mm radial section height gives 2.7 kN per section millimetre; the 1750 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. The 3 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 95.6/69.5 kN ratings and 1750 g mass this execution carries about 1.59 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 6,300 r/min against a 6,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.05. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7312-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7312 BEP as the single basic pa66 execution; the other order numbers of the 7312 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7312-BEP?",
        "a": "7312 BEP measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 1750 g. SKF 17000 ratings: C 95.6 kN, C0 69.5 kN, Pu 3 kN, reference speed 6,300 r/min (thermal) and limiting speed 6,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7312-BEP?",
        "a": "With a rotating inner ring use roughly k5 on the 60 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7312-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7312-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (95.6/69.5 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (95.6/69.5 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (95.6/69.5 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (95.6/69.5 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (95.6/69.5 kN vs 116/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (95.6/69.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (95.6/69.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (95.6/69.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7312 BEP is the basic 60×130×31 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7312-BEP",
      "7312 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7312-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7312 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 104,
    "static_load_kN": 76.5,
    "fatigue_load_limit_kN": 3.2,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7312 BECBP is SKF's 60 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 60×130×31 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 60×130×31 mm (2.362×5.118×1.22 in), 35.0 mm radial section height, C 104 kN, C0 76.5 kN, Pu 3.2 kN.reference speed 6,300 r/min (thermal) and limiting speed 6,700 r/min (mechanical), catalogue mass 1750 g. Load balance: C0 76.5 kN against C 104 kN gives a 0.74 ratio, typical of a steep-angle axial-oriented design; Pu 3.2 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 60 mm bore: 104 kN C divided by the 35.0 mm radial section height gives 3.0 kN per section millimetre; the 1750 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 6,300 r/min against a 6,700 r/min limiting speed, i.e. a reference-to-limit ratio of 0.94. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7312-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7312-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7312-BECBP?",
        "a": "7312 BECBP measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 1750 g. SKF 17000 ratings: C 104 kN, C0 76.5 kN, Pu 3.2 kN, reference speed 6,300 r/min (thermal) and limiting speed 6,700 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7312-BECBP?",
        "a": "With a rotating inner ring use roughly k5 on the 60 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7312-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7312-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 95.6/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 7312 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 7312 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 7312 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 116/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7312 BEP shares the 60×130×31 mm angular-contact envelope, but catalogue C/C0 differ (104/76.5 kN vs 95.6/69.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7312-BECBP",
      "7312 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7312-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7312 BECBPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 104,
    "static_load_kN": 76.5,
    "fatigue_load_limit_kN": 3.2,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7312 BECBPH is SKF's 60 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 60×130×31 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 60×130×31 mm (2.362×5.118×1.22 in), 35.0 mm radial section height, C 104 kN, C0 76.5 kN, Pu 3.2 kN.reference speed 6,300 r/min (thermal) and limiting speed 6,700 r/min (mechanical), catalogue mass 1750 g. Sizing arithmetic on the 60 mm bore: 104 kN C divided by the 35.0 mm radial section height gives 3.0 kN per section millimetre; the 1750 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 31 mm width over a 35.0 mm section yields 0.89 mm of ring width per section millimetre, and the bearing weighs 1750 g for 104 kN of dynamic capacity — about 17 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 6,300 r/min against a 6,700 r/min limiting speed, i.e. a reference-to-limit ratio of 0.94. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 60 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7312-BECBPH of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Assign interference to the rotating ring — roughly k5 on a 60 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the chamfer so the 31 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7312-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7312-BECBPH?",
        "a": "7312 BECBPH measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 1750 g. SKF 17000 ratings: C 104 kN, C0 76.5 kN, Pu 3.2 kN, reference speed 6,300 r/min (thermal) and limiting speed 6,700 r/min (mechanical)."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "Which grease and fill for 7312-BECBPH?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 6,700 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7312-BECBPH?",
        "a": "The 6,300 r/min reference (thermal) and 6,700 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7312-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7312-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 95.6/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 7312 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 7312 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 7312 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 116/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7312 BEP shares the 60×130×31 mm angular-contact envelope, but catalogue C/C0 differ (104/76.5 kN vs 95.6/69.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7312-BECBPH",
      "7312 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7312-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7312 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 104,
    "static_load_kN": 76.5,
    "fatigue_load_limit_kN": 3.2,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7312 BECBY is SKF's 60 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 60×130×31 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 60×130×31 mm (2.362×5.118×1.22 in), 35.0 mm radial section height, C 104 kN, C0 76.5 kN, Pu 3.2 kN.reference speed 6,300 r/min (thermal) and limiting speed 6,700 r/min (mechanical), catalogue mass 1750 g. The 3.2 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 104/76.5 kN ratings and 1750 g mass this execution carries about 1.73 kN of C per millimetre of bore. Sizing arithmetic on the 60 mm bore: 104 kN C divided by the 35.0 mm radial section height gives 3.0 kN per section millimetre; the 1750 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 6,300 r/min against a 6,700 r/min limiting speed, i.e. a reference-to-limit ratio of 0.94. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "raceway staining from water in the lubricant during idle periods",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7312-BECBY locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Do not mix execution classes inside one set: a universally matchable BECBY unit is ground for arbitrary pairing, a basic execution is not.",
      "Fillet radii must clear the chamfer so the 31 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7312-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7312-BECBY?",
        "a": "7312 BECBY measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 1750 g. SKF 17000 ratings: C 104 kN, C0 76.5 kN, Pu 3.2 kN, reference speed 6,300 r/min (thermal) and limiting speed 6,700 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which grease and fill for 7312-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 6,700 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7312-BECBY?",
        "a": "The 6,300 r/min reference (thermal) and 6,700 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7312-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7312-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 95.6/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 7312 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 7312 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 7312 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 116/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7312 BEP shares the 60×130×31 mm angular-contact envelope, but catalogue C/C0 differ (104/76.5 kN vs 95.6/69.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7312-BECBY",
      "7312 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7312-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7312 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 104,
    "static_load_kN": 76.5,
    "fatigue_load_limit_kN": 3.2,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7312 BECBM is SKF's 60 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 60×130×31 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 60×130×31 mm (2.362×5.118×1.22 in), 35.0 mm radial section height, C 104 kN, C0 76.5 kN, Pu 3.2 kN.reference speed 6,300 r/min (thermal) and limiting speed 8,500 r/min (mechanical), catalogue mass 1750 g. At the printed limiting speed of 8,500 r/min the mean pitch diameter dm ≈ 95.0 mm implies a dn value around 808k mm·r/min; the 6,300 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 31 mm width over a 35.0 mm section yields 0.89 mm of ring width per section millimetre, and the bearing weighs 1750 g for 104 kN of dynamic capacity — about 17 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 6,300 r/min against a 8,500 r/min limiting speed, i.e. a reference-to-limit ratio of 0.74. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives",
      "heavy feed and take-up rolls"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "edge loading from shaft deflection or housing misalignment",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Assign interference to the rotating ring — roughly k5 on a 60 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "At 60 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7312-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7312-BECBM?",
        "a": "7312 BECBM measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 1750 g. SKF 17000 ratings: C 104 kN, C0 76.5 kN, Pu 3.2 kN, reference speed 6,300 r/min (thermal) and limiting speed 8,500 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7312-BECBM?",
        "a": "With a rotating inner ring use roughly k5 on the 60 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7312-BECBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 8,500 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7312-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7312-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 95.6/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 7312 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 7312 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; 7312 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 116/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (104/76.5 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7312 BEP shares the 60×130×31 mm angular-contact envelope, but catalogue C/C0 differ (104/76.5 kN vs 95.6/69.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7312-BECBM",
      "7312 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7312-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7312 ACCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 116,
    "static_load_kN": 85,
    "fatigue_load_limit_kN": 3.6,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7312 ACCBM is SKF's 60 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 25° (AC) contact angle, 60×130×31 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 60×130×31 mm (2.362×5.118×1.22 in), 35.0 mm radial section height, C 116 kN, C0 85 kN, Pu 3.6 kN.reference speed 7,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 1750 g. At the printed limiting speed of 10,000 r/min the mean pitch diameter dm ≈ 95.0 mm implies a dn value around 950k mm·r/min; the 7,000 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 31 mm width over a 35.0 mm section yields 0.89 mm of ring width per section millimetre, and the bearing weighs 1750 g for 116 kN of dynamic capacity — about 15 g per rated kN. Bore-to-OD planning: OD 130 over bore 60 is a 2.17× step for this size, and the 31 mm width gives a bore/width ratio of 1.94; use these ratios when housing space around the 60 mm shaft is the first constraint. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives",
      "printing and paper-machine rolls"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of ACCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 0,55 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7312-ACCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The 25° AC angle of 7312-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7312-ACCBM?",
        "a": "7312 ACCBM measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 1750 g. SKF 17000 ratings: C 116 kN, C0 85 kN, Pu 3.6 kN, reference speed 7,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7312-ACCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7312-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7312-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (116/85 kN vs 95.6/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (116/85 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (116/85 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (116/85 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (116/85 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (116/85 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (116/85 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (116/85 kN vs 156/137 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7312 BEP shares the 60×130×31 mm angular-contact envelope, but catalogue C/C0 differ (116/85 kN vs 95.6/69.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7312-ACCBM",
      "7312 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7213-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7213 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 66.3,
    "static_load_kN": 54,
    "fatigue_load_limit_kN": 2.28,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7213 BEP is SKF's 65 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 65×120×23 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 65×120×23 mm (2.559×4.724×0.906 in), 27.5 mm radial section height, C 66.3 kN, C0 54 kN, Pu 2.28 kN.reference speed 6,700 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 1000 g. The 2.28 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 66.3/54 kN ratings and 1000 g mass this execution carries about 1.02 kN of C per millimetre of bore. Sizing arithmetic on the 65 mm bore: 66.3 kN C divided by the 27.5 mm radial section height gives 2.4 kN per section millimetre; the 1000 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 6,700 r/min against a 6,300 r/min limiting speed, i.e. a reference-to-limit ratio of 1.06. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "raceway staining from water in the lubricant during idle periods",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "At 65 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7213-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7213 BEP as the single basic pa66 execution; the other order numbers of the 7213 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7213-BEP?",
        "a": "7213 BEP measures 65 mm bore × 120 mm OD × 23 mm width (2.559 × 4.724 × 0.906 in), mass about 1000 g. SKF 17000 ratings: C 66.3 kN, C0 54 kN, Pu 2.28 kN, reference speed 6,700 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7213-BEP?",
        "a": "With a rotating inner ring use roughly k5 on the 65 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7213-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7213-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (66.3/54 kN vs 81.5/65.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (66.3/54 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (66.3/54 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (66.3/54 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7213 BEP is the basic 65×120×23 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7213-BEP",
      "7213 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7213-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7213 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 57,
    "fatigue_load_limit_kN": 2.45,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7213 BECBP is SKF's 65 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 65×120×23 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 65×120×23 mm (2.559×4.724×0.906 in), 27.5 mm radial section height, C 69.5 kN, C0 57 kN, Pu 2.45 kN.reference speed 6,700 r/min (thermal) and limiting speed 6,700 r/min (mechanical), which coincide for this size, catalogue mass 1000 g. Mass and section check: 1000 g inside the 65×120×23 mm outline leaves a 27.5 mm radial section, and the 57 kN static rating is 0.82× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 2.45 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 69.5/57 kN ratings and 1000 g mass this execution carries about 1.07 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 6,700 r/min against a 6,700 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives",
      "heavy feed and take-up rolls"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7213-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7213-BECBP?",
        "a": "7213 BECBP measures 65 mm bore × 120 mm OD × 23 mm width (2.559 × 4.724 × 0.906 in), mass about 1000 g. SKF 17000 ratings: C 69.5 kN, C0 57 kN, Pu 2.45 kN, reference speed 6,700 r/min (thermal) and limiting speed 6,700 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7213-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 6,700 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7213-BECBP?",
        "a": "The 6,700 r/min reference (thermal) and 6,700 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7213-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7213-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 81.5/65.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7213 BEP is the basic 65×120×23 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7213-BECBP",
      "7213 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7213-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7213 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 57,
    "fatigue_load_limit_kN": 2.45,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7213 BECBY is SKF's 65 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 65×120×23 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 65×120×23 mm (2.559×4.724×0.906 in), 27.5 mm radial section height, C 69.5 kN, C0 57 kN, Pu 2.45 kN.reference speed 6,700 r/min (thermal) and limiting speed 6,700 r/min (mechanical), which coincide for this size, catalogue mass 1000 g. Sizing arithmetic on the 65 mm bore: 69.5 kN C divided by the 27.5 mm radial section height gives 2.5 kN per section millimetre; the 1000 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. The 2.45 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 69.5/57 kN ratings and 1000 g mass this execution carries about 1.07 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 6,700 r/min against a 6,700 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 65 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Do not mix execution classes inside one set: a universally matchable BECBY unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7213-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7213-BECBY?",
        "a": "7213 BECBY measures 65 mm bore × 120 mm OD × 23 mm width (2.559 × 4.724 × 0.906 in), mass about 1000 g. SKF 17000 ratings: C 69.5 kN, C0 57 kN, Pu 2.45 kN, reference speed 6,700 r/min (thermal) and limiting speed 6,700 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7213-BECBY?",
        "a": "With a rotating inner ring use roughly k5 on the 65 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7213-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7213-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 81.5/65.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7213 BEP is the basic 65×120×23 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7213-BECBY",
      "7213 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7213-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7213 BEGAPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 57,
    "fatigue_load_limit_kN": 2.45,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7213 BEGAPH is SKF's 65 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 65×120×23 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 65×120×23 mm (2.559×4.724×0.906 in), 27.5 mm radial section height, C 69.5 kN, C0 57 kN, Pu 2.45 kN.reference speed 6,700 r/min (thermal) and limiting speed 6,700 r/min (mechanical), which coincide for this size, catalogue mass 1000 g. The 2.45 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 69.5/57 kN ratings and 1000 g mass this execution carries about 1.07 kN of C per millimetre of bore. Selection figures for 7213 BEGAPH: the static-to-dynamic ratio C0/C is 0.82, Pu 2.45 kN is about 4 % of C, and catalogue mass works out to roughly 15 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 6,700 r/min against a 6,700 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BEGAPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Do not mix execution classes inside one set: a universally matchable BEGAPH unit is ground for arbitrary pairing, a basic execution is not.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEGAPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7213-BEGAPH locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7213-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7213-BEGAPH?",
        "a": "7213 BEGAPH measures 65 mm bore × 120 mm OD × 23 mm width (2.559 × 4.724 × 0.906 in), mass about 1000 g. SKF 17000 ratings: C 69.5 kN, C0 57 kN, Pu 2.45 kN, reference speed 6,700 r/min (thermal) and limiting speed 6,700 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "Which grease and fill for 7213-BEGAPH?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 6,700 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7213-BEGAPH?",
        "a": "The 6,700 r/min reference (thermal) and 6,700 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7213-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7213-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 81.5/65.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7213 BEP is the basic 65×120×23 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7213-BEGAPH",
      "7213 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7213-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7213 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 57,
    "fatigue_load_limit_kN": 2.45,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7213 BECBM is SKF's 65 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 65×120×23 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 65×120×23 mm (2.559×4.724×0.906 in), 27.5 mm radial section height, C 69.5 kN, C0 57 kN, Pu 2.45 kN.reference speed 6,700 r/min (thermal) and limiting speed 8,500 r/min (mechanical), catalogue mass 1000 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 8,500 r/min while thermal balance under catalogue load sets the 6,700 r/min reference; at dm ≈ 92.5 mm the corresponding dn is approximately 786k mm·r/min. Selection figures for 7213 BECBM: the static-to-dynamic ratio C0/C is 0.82, Pu 2.45 kN is about 4 % of C, and catalogue mass works out to roughly 15 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 6,700 r/min against a 8,500 r/min limiting speed, i.e. a reference-to-limit ratio of 0.79. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "At 65 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "At 65 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7213-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7213-BECBM?",
        "a": "7213 BECBM measures 65 mm bore × 120 mm OD × 23 mm width (2.559 × 4.724 × 0.906 in), mass about 1000 g. SKF 17000 ratings: C 69.5 kN, C0 57 kN, Pu 2.45 kN, reference speed 6,700 r/min (thermal) and limiting speed 8,500 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7213-BECBM?",
        "a": "The 6,700 r/min reference (thermal) and 8,500 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7213-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7213-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7213-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; 7213 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 81.5/65.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (69.5/57 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7213 BEP is the basic 65×120×23 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7213-BECBM",
      "7213 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7213-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7213 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 81.5,
    "static_load_kN": 65.5,
    "fatigue_load_limit_kN": 2.8,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7213 ACCBM is SKF's 65 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 65×120×23 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 65×120×23 mm (2.559×4.724×0.906 in), 27.5 mm radial section height, C 81.5 kN, C0 65.5 kN, Pu 2.8 kN.reference speed 7,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 1000 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 10,000 r/min while thermal balance under catalogue load sets the 7,000 r/min reference; at dm ≈ 92.5 mm the corresponding dn is approximately 925k mm·r/min. Selection figures for 7213 ACCBM: the static-to-dynamic ratio C0/C is 0.80, Pu 2.8 kN is about 3 % of C, and catalogue mass works out to roughly 15 g per millimetre of bore. Bore-to-OD planning: OD 120 over bore 65 is a 1.85× step for this size, and the 23 mm width gives a bore/width ratio of 2.83; use these ratios when housing space around the 65 mm shaft is the first constraint. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Preload the set against a calculated stand-off dimension — the ground faces of ACCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "At 65 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The 25° AC angle of 7213-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7213-ACCBM?",
        "a": "7213 ACCBM measures 65 mm bore × 120 mm OD × 23 mm width (2.559 × 4.724 × 0.906 in), mass about 1000 g. SKF 17000 ratings: C 81.5 kN, C0 65.5 kN, Pu 2.8 kN, reference speed 7,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7213-ACCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7213-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7213-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (81.5/65.5 kN vs 66.3/54 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (81.5/65.5 kN vs 69.5/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (81.5/65.5 kN vs 69.5/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (81.5/65.5 kN vs 69.5/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (81.5/65.5 kN vs 69.5/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (81.5/65.5 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (81.5/65.5 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (81.5/65.5 kN vs 110/112 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7213 BEP shares the 65×120×23 mm angular-contact envelope, but catalogue C/C0 differ (81.5/65.5 kN vs 66.3/54 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7213-ACCBM",
      "7213 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7313-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7313 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 108,
    "static_load_kN": 80,
    "fatigue_load_limit_kN": 3.35,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 2150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7313 BEP is SKF's 65 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 65×140×33 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 65×140×33 mm (2.559×5.512×1.299 in), 37.5 mm radial section height, C 108 kN, C0 80 kN, Pu 3.35 kN.reference speed 6,000 r/min (thermal) and limiting speed 5,600 r/min (mechanical), catalogue mass 2150 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,600 r/min while thermal balance under catalogue load sets the 6,000 r/min reference; at dm ≈ 102.5 mm the corresponding dn is approximately 574k mm·r/min. Sizing arithmetic on the 65 mm bore: 108 kN C divided by the 37.5 mm radial section height gives 2.9 kN per section millimetre; the 2150 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 6,000 r/min against a 5,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.07. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "One 7313-BEP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "At 65 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7313-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7313 BEP as the single basic pa66 execution; the other order numbers of the 7313 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7313-BEP?",
        "a": "7313 BEP measures 65 mm bore × 140 mm OD × 33 mm width (2.559 × 5.512 × 1.299 in), mass about 2150 g. SKF 17000 ratings: C 108 kN, C0 80 kN, Pu 3.35 kN, reference speed 6,000 r/min (thermal) and limiting speed 5,600 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7313-BEP?",
        "a": "The 6,000 r/min reference (thermal) and 5,600 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7313-BEP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7313-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7313-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (108/80 kN vs 132/96.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-313-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (108/80 kN vs 176/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-313-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (108/80 kN vs 176/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7313",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7313 BEP is the basic 65×140×33 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7313-BEP",
      "7313 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7313-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7313 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 116,
    "static_load_kN": 86.5,
    "fatigue_load_limit_kN": 3.65,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 2150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7313 BECBP is SKF's 65 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 65×140×33 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 65×140×33 mm (2.559×5.512×1.299 in), 37.5 mm radial section height, C 116 kN, C0 86.5 kN, Pu 3.65 kN.reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 2150 g. At the printed limiting speed of 6,300 r/min the mean pitch diameter dm ≈ 102.5 mm implies a dn value around 646k mm·r/min; the 6,000 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 33 mm width over a 37.5 mm section yields 0.88 mm of ring width per section millimetre, and the bearing weighs 2150 g for 116 kN of dynamic capacity — about 19 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 6,000 r/min against a 6,300 r/min limiting speed, i.e. a reference-to-limit ratio of 0.95. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "edge loading from shaft deflection or housing misalignment",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7313-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7313-BECBP?",
        "a": "7313 BECBP measures 65 mm bore × 140 mm OD × 33 mm width (2.559 × 5.512 × 1.299 in), mass about 2150 g. SKF 17000 ratings: C 116 kN, C0 86.5 kN, Pu 3.65 kN, reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7313-BECBP?",
        "a": "With a rotating inner ring use roughly k5 on the 65 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7313-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 6,300 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7313-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7313-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (116/86.5 kN vs 132/96.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-313-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (116/86.5 kN vs 176/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-313-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (116/86.5 kN vs 176/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7313",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7313 BEP is the basic 65×140×33 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7313-BECBP",
      "7313 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7313-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7313 BECBPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 116,
    "static_load_kN": 86.5,
    "fatigue_load_limit_kN": 3.65,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 2150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7313 BECBPH is SKF's 65 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 65×140×33 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 65×140×33 mm (2.559×5.512×1.299 in), 37.5 mm radial section height, C 116 kN, C0 86.5 kN, Pu 3.65 kN.reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 2150 g. At the printed limiting speed of 6,300 r/min the mean pitch diameter dm ≈ 102.5 mm implies a dn value around 646k mm·r/min; the 6,000 r/min reference speed is the thermal-planning figure under catalogue load. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 6,300 r/min while thermal balance under catalogue load sets the 6,000 r/min reference; at dm ≈ 102.5 mm the corresponding dn is approximately 646k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 6,000 r/min against a 6,300 r/min limiting speed, i.e. a reference-to-limit ratio of 0.95. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives",
      "printing and paper-machine rolls"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7313-BECBPH of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7313-BECBPH of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7313-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7313-BECBPH?",
        "a": "7313 BECBPH measures 65 mm bore × 140 mm OD × 33 mm width (2.559 × 5.512 × 1.299 in), mass about 2150 g. SKF 17000 ratings: C 116 kN, C0 86.5 kN, Pu 3.65 kN, reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "Which fits should I use for 7313-BECBPH?",
        "a": "With a rotating inner ring use roughly k5 on the 65 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7313-BECBPH?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 6,300 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7313-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7313-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (116/86.5 kN vs 132/96.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-313-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (116/86.5 kN vs 176/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-313-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (116/86.5 kN vs 176/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7313",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7313 BEP is the basic 65×140×33 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7313-BECBPH",
      "7313 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7313-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7313 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 116,
    "static_load_kN": 86.5,
    "fatigue_load_limit_kN": 3.65,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 2150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7313 BECBY is SKF's 65 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 65×140×33 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 65×140×33 mm (2.559×5.512×1.299 in), 37.5 mm radial section height, C 116 kN, C0 86.5 kN, Pu 3.65 kN.reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 2150 g. At the printed limiting speed of 6,300 r/min the mean pitch diameter dm ≈ 102.5 mm implies a dn value around 646k mm·r/min; the 6,000 r/min reference speed is the thermal-planning figure under catalogue load. The 3.65 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 116/86.5 kN ratings and 2150 g mass this execution carries about 1.78 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 6,000 r/min against a 6,300 r/min limiting speed, i.e. a reference-to-limit ratio of 0.95. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "edge loading from shaft deflection or housing misalignment",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Do not mix execution classes inside one set: a universally matchable BECBY unit is ground for arbitrary pairing, a basic execution is not.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "At 65 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7313-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7313-BECBY?",
        "a": "7313 BECBY measures 65 mm bore × 140 mm OD × 33 mm width (2.559 × 5.512 × 1.299 in), mass about 2150 g. SKF 17000 ratings: C 116 kN, C0 86.5 kN, Pu 3.65 kN, reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What minimum axial load does 7313-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7313-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7313-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (116/86.5 kN vs 132/96.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-313-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (116/86.5 kN vs 176/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-313-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (116/86.5 kN vs 176/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7313",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7313 BEP is the basic 65×140×33 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7313-BECBY",
      "7313 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7313-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7313 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 116,
    "static_load_kN": 86.5,
    "fatigue_load_limit_kN": 3.65,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 2150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7313 BECBM is SKF's 65 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 65×140×33 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 65×140×33 mm (2.559×5.512×1.299 in), 37.5 mm radial section height, C 116 kN, C0 86.5 kN, Pu 3.65 kN.reference speed 6,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical), catalogue mass 2150 g. Load balance: C0 86.5 kN against C 116 kN gives a 0.75 ratio, typical of a steep-angle axial-oriented design; Pu 3.65 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 65 mm bore: 116 kN C divided by the 37.5 mm radial section height gives 3.1 kN per section millimetre; the 2150 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 6,000 r/min against a 8,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.75. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "At 65 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "One 7313-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "At 65 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7313-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7313-BECBM?",
        "a": "7313 BECBM measures 65 mm bore × 140 mm OD × 33 mm width (2.559 × 5.512 × 1.299 in), mass about 2150 g. SKF 17000 ratings: C 116 kN, C0 86.5 kN, Pu 3.65 kN, reference speed 6,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7313-BECBM?",
        "a": "With a rotating inner ring use roughly k5 on the 65 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7313-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7313-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope with catalogue ratings within 10 %; 7313 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7313-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (116/86.5 kN vs 132/96.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-313-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (116/86.5 kN vs 176/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-313-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (116/86.5 kN vs 176/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7313",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7313 BEP is the basic 65×140×33 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7313-BECBM",
      "7313 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7313-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7313 ACCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 132,
    "static_load_kN": 96.5,
    "fatigue_load_limit_kN": 4.05,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 9500,
    "max_rpm": 9500,
    "weight_g": 2150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7313 ACCBM is SKF's 65 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 25° (AC) contact angle, 65×140×33 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 65×140×33 mm (2.559×5.512×1.299 in), 37.5 mm radial section height, C 132 kN, C0 96.5 kN, Pu 4.05 kN.reference speed 6,300 r/min (thermal) and limiting speed 9,500 r/min (mechanical), catalogue mass 2150 g. Mass and section check: 2150 g inside the 65×140×33 mm outline leaves a 37.5 mm radial section, and the 96.5 kN static rating is 0.73× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 4.05 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 132/96.5 kN ratings and 2150 g mass this execution carries about 2.03 kN of C per millimetre of bore. Bore-to-OD planning: OD 140 over bore 65 is a 2.15× step for this size, and the 33 mm width gives a bore/width ratio of 1.97; use these ratios when housing space around the 65 mm shaft is the first constraint. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "centrifuge and separator drives",
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 0,55 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Preload the set against a calculated stand-off dimension — the ground faces of ACCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Do not mix execution classes inside one set: a universally matchable ACCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Preload the set against a calculated stand-off dimension — the ground faces of ACCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The 25° AC angle of 7313-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7313-ACCBM?",
        "a": "7313 ACCBM measures 65 mm bore × 140 mm OD × 33 mm width (2.559 × 5.512 × 1.299 in), mass about 2150 g. SKF 17000 ratings: C 132 kN, C0 96.5 kN, Pu 4.05 kN, reference speed 6,300 r/min (thermal) and limiting speed 9,500 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7313-ACCBM?",
        "a": "With a rotating inner ring use roughly k5 on the 65 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7313-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7313-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (132/96.5 kN vs 108/80 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7313-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (132/96.5 kN vs 116/86.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7313-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (132/96.5 kN vs 116/86.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7313-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (132/96.5 kN vs 116/86.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7313-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (132/96.5 kN vs 116/86.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-313-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (132/96.5 kN vs 176/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-313-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope, but catalogue C/C0 differ between executions (132/96.5 kN vs 176/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7313",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7313 BEP shares the 65×140×33 mm angular-contact envelope, but catalogue C/C0 differ (132/96.5 kN vs 108/80 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7313-ACCBM",
      "7313 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7214-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7214 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 67.6,
    "static_load_kN": 56,
    "fatigue_load_limit_kN": 2.36,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7214 BEP is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 70×125×24 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 70×125×24 mm (2.756×4.921×0.945 in), 27.5 mm radial section height, C 67.6 kN, C0 56 kN, Pu 2.36 kN.reference speed 6,300 r/min (thermal) and limiting speed 6,000 r/min (mechanical), catalogue mass 1100 g. Envelope economics: the 24 mm width over a 27.5 mm section yields 0.87 mm of ring width per section millimetre, and the bearing weighs 1100 g for 67.6 kN of dynamic capacity — about 16 g per rated kN. Mass and section check: 1100 g inside the 70×125×24 mm outline leaves a 27.5 mm radial section, and the 56 kN static rating is 0.83× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 125 over bore 70 is a 1.79× step for this size, and the 24 mm width gives a bore/width ratio of 2.92; use these ratios when housing space around the 70 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives",
      "heavy feed and take-up rolls"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 70 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "At 70 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7214-BEP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7214-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7214 BEP as the single basic pa66 execution; the other order numbers of the 7214 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7214-BEP?",
        "a": "7214 BEP measures 70 mm bore × 125 mm OD × 24 mm width (2.756 × 4.921 × 0.945 in), mass about 1100 g. SKF 17000 ratings: C 67.6 kN, C0 56 kN, Pu 2.36 kN, reference speed 6,300 r/min (thermal) and limiting speed 6,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7214-BEP?",
        "a": "The 6,300 r/min reference (thermal) and 6,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7214-BEP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7214-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7214-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (67.6/56 kN vs 75/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7214-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (67.6/56 kN vs 83/68 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (67.6/56 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (67.6/56 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (67.6/56 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7214",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7214 BEP is the basic 70×125×24 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7214-BEP",
      "7214 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7214-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7214 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 72,
    "static_load_kN": 60,
    "fatigue_load_limit_kN": 2.55,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7214 BECBP is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 70×125×24 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 70×125×24 mm (2.756×4.921×0.945 in), 27.5 mm radial section height, C 72 kN, C0 60 kN, Pu 2.55 kN.reference speed 6,300 r/min (thermal) and limiting speed 6,300 r/min (mechanical), which coincide for this size, catalogue mass 1100 g. Selection figures for 7214 BECBP: the static-to-dynamic ratio C0/C is 0.83, Pu 2.55 kN is about 4 % of C, and catalogue mass works out to roughly 16 g per millimetre of bore. At the printed limiting speed of 6,300 r/min the mean pitch diameter dm ≈ 97.5 mm implies a dn value around 614k mm·r/min; the 6,300 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 125 over bore 70 is a 1.79× step for this size, and the 24 mm width gives a bore/width ratio of 2.92; use these ratios when housing space around the 70 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Do not mix execution classes inside one set: a universally matchable BECBP unit is ground for arbitrary pairing, a basic execution is not.",
      "One 7214-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7214-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7214-BECBP?",
        "a": "7214 BECBP measures 70 mm bore × 125 mm OD × 24 mm width (2.756 × 4.921 × 0.945 in), mass about 1100 g. SKF 17000 ratings: C 72 kN, C0 60 kN, Pu 2.55 kN, reference speed 6,300 r/min (thermal) and limiting speed 6,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7214-BECBP?",
        "a": "With a rotating inner ring use roughly k5 on the 70 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7214-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 6,300 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7214-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7214-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (72/60 kN vs 83/68 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (72/60 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (72/60 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (72/60 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7214",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7214 BEP is the basic 70×125×24 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7214-BECBP",
      "7214 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7214-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7214 BECBPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 72,
    "static_load_kN": 60,
    "fatigue_load_limit_kN": 2.55,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7214 BECBPH is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 70×125×24 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 70×125×24 mm (2.756×4.921×0.945 in), 27.5 mm radial section height, C 72 kN, C0 60 kN, Pu 2.55 kN.reference speed 6,300 r/min (thermal) and limiting speed 6,300 r/min (mechanical), which coincide for this size, catalogue mass 1100 g. Selection figures for 7214 BECBPH: the static-to-dynamic ratio C0/C is 0.83, Pu 2.55 kN is about 4 % of C, and catalogue mass works out to roughly 16 g per millimetre of bore. Envelope economics: the 24 mm width over a 27.5 mm section yields 0.87 mm of ring width per section millimetre, and the bearing weighs 1100 g for 72 kN of dynamic capacity — about 15 g per rated kN. Bore-to-OD planning: OD 125 over bore 70 is a 1.79× step for this size, and the 24 mm width gives a bore/width ratio of 2.92; use these ratios when housing space around the 70 mm shaft is the first constraint. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "brinelling from pressing the ring home through the balls or from static overload",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7214-BECBPH of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Assign interference to the rotating ring — roughly k5 on a 70 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7214-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7214-BECBPH?",
        "a": "7214 BECBPH measures 70 mm bore × 125 mm OD × 24 mm width (2.756 × 4.921 × 0.945 in), mass about 1100 g. SKF 17000 ratings: C 72 kN, C0 60 kN, Pu 2.55 kN, reference speed 6,300 r/min (thermal) and limiting speed 6,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "What minimum axial load does 7214-BECBPH need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7214-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7214-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (72/60 kN vs 83/68 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (72/60 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (72/60 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (72/60 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7214",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7214 BEP is the basic 70×125×24 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7214-BECBPH",
      "7214 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7214-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7214 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 72,
    "static_load_kN": 60,
    "fatigue_load_limit_kN": 2.55,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7214 BECBM is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 70×125×24 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 70×125×24 mm (2.756×4.921×0.945 in), 27.5 mm radial section height, C 72 kN, C0 60 kN, Pu 2.55 kN.reference speed 6,300 r/min (thermal) and limiting speed 8,000 r/min (mechanical), catalogue mass 1100 g. Sizing arithmetic on the 70 mm bore: 72 kN C divided by the 27.5 mm radial section height gives 2.6 kN per section millimetre; the 1100 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 1100 g inside the 70×125×24 mm outline leaves a 27.5 mm radial section, and the 60 kN static rating is 0.83× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 125 over bore 70 is a 1.79× step for this size, and the 24 mm width gives a bore/width ratio of 2.92; use these ratios when housing space around the 70 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 24 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7214-BECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7214-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7214-BECBM?",
        "a": "7214 BECBM measures 70 mm bore × 125 mm OD × 24 mm width (2.756 × 4.921 × 0.945 in), mass about 1100 g. SKF 17000 ratings: C 72 kN, C0 60 kN, Pu 2.55 kN, reference speed 6,300 r/min (thermal) and limiting speed 8,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7214-BECBM?",
        "a": "With a rotating inner ring use roughly k5 on the 70 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7214-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7214-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (72/60 kN vs 83/68 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (72/60 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (72/60 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (72/60 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7214",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7214 BEP is the basic 70×125×24 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7214-BECBM",
      "7214 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7214-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7214 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 75,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 2.7,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7214 BECBY is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 70×125×24 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 70×125×24 mm (2.756×4.921×0.945 in), 27.5 mm radial section height, C 75 kN, C0 64 kN, Pu 2.7 kN.reference speed 6,300 r/min (thermal) and limiting speed 6,300 r/min (mechanical), which coincide for this size, catalogue mass 1100 g. Selection figures for 7214 BECBY: the static-to-dynamic ratio C0/C is 0.85, Pu 2.7 kN is about 4 % of C, and catalogue mass works out to roughly 16 g per millimetre of bore. Load balance: C0 64 kN against C 75 kN gives a 0.85 ratio, typical of a steep-angle axial-oriented design; Pu 2.7 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 125 over bore 70 is a 1.79× step for this size, and the 24 mm width gives a bore/width ratio of 2.92; use these ratios when housing space around the 70 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Fillet radii must clear the chamfer so the 24 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7214-BECBY locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7214-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7214-BECBY?",
        "a": "7214 BECBY measures 70 mm bore × 125 mm OD × 24 mm width (2.756 × 4.921 × 0.945 in), mass about 1100 g. SKF 17000 ratings: C 75 kN, C0 64 kN, Pu 2.7 kN, reference speed 6,300 r/min (thermal) and limiting speed 6,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What minimum axial load does 7214-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7214-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7214-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (75/64 kN vs 67.6/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7214-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope with catalogue ratings within 10 %; 7214 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7214-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (75/64 kN vs 83/68 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (75/64 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (75/64 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (75/64 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7214",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7214 BEP shares the 70×125×24 mm angular-contact envelope, but catalogue C/C0 differ (75/64 kN vs 67.6/56 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7214-BECBY",
      "7214 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7214-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7214 ACCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 83,
    "static_load_kN": 68,
    "fatigue_load_limit_kN": 2.9,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7214 ACCBM is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 25° (AC) contact angle, 70×125×24 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 70×125×24 mm (2.756×4.921×0.945 in), 27.5 mm radial section height, C 83 kN, C0 68 kN, Pu 2.9 kN.reference speed 6,700 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 1100 g. Sizing arithmetic on the 70 mm bore: 83 kN C divided by the 27.5 mm radial section height gives 3.0 kN per section millimetre; the 1100 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 1100 g inside the 70×125×24 mm outline leaves a 27.5 mm radial section, and the 68 kN static rating is 0.82× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 6,700 r/min against a 10,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.67. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "fretting corrosion on a loose rotating shaft seat",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "One 7214-ACCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Assign interference to the rotating ring — roughly k5 on a 70 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Do not mix execution classes inside one set: a universally matchable ACCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "The 25° AC angle of 7214-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7214-ACCBM?",
        "a": "7214 ACCBM measures 70 mm bore × 125 mm OD × 24 mm width (2.756 × 4.921 × 0.945 in), mass about 1100 g. SKF 17000 ratings: C 83 kN, C0 68 kN, Pu 2.9 kN, reference speed 6,700 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7214-ACCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 25° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7214-ACCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7214-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7214-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (83/68 kN vs 67.6/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7214-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (83/68 kN vs 72/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7214-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (83/68 kN vs 72/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7214-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (83/68 kN vs 72/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7214-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (83/68 kN vs 75/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (83/68 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (83/68 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-214-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope, but catalogue C/C0 differ between executions (83/68 kN vs 120/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7214",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7214 BEP shares the 70×125×24 mm angular-contact envelope, but catalogue C/C0 differ (83/68 kN vs 67.6/56 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7214-ACCBM",
      "7214 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7314-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7314 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 119,
    "static_load_kN": 90,
    "fatigue_load_limit_kN": 3.65,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7314 BEP is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 70×150×35 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 70×150×35 mm (2.756×5.906×1.378 in), 40.0 mm radial section height, C 119 kN, C0 90 kN, Pu 3.65 kN.reference speed 5,600 r/min (thermal) and limiting speed 5,300 r/min (mechanical), catalogue mass 2650 g. Load balance: C0 90 kN against C 119 kN gives a 0.76 ratio, typical of a steep-angle axial-oriented design; Pu 3.65 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 2650 g inside the 70×150×35 mm outline leaves a 40.0 mm radial section, and the 90 kN static rating is 0.76× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 150 over bore 70 is a 2.14× step for this size, and the 35 mm width gives a bore/width ratio of 2.00; use these ratios when housing space around the 70 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives",
      "printing and paper-machine rolls"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7314-BEP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Assign interference to the rotating ring — roughly k5 on a 70 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7314-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7314 BEP as the single basic pa66 execution; the other order numbers of the 7314 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7314-BEP?",
        "a": "7314 BEP measures 70 mm bore × 150 mm OD × 35 mm width (2.756 × 5.906 × 1.378 in), mass about 2650 g. SKF 17000 ratings: C 119 kN, C0 90 kN, Pu 3.65 kN, reference speed 5,600 r/min (thermal) and limiting speed 5,300 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Can one 7314-BEP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7314-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7314-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7314-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (119/90 kN vs 143/110 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (119/90 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (119/90 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (119/90 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7314 BEP is the basic 70×150×35 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7314-BEP",
      "7314 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7314-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7314 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 127,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 3.9,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7314 BECBP is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 70×150×35 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 70×150×35 mm (2.756×5.906×1.378 in), 40.0 mm radial section height, C 127 kN, C0 98 kN, Pu 3.9 kN.reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size, catalogue mass 2650 g. The 3.9 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 127/98 kN ratings and 2650 g mass this execution carries about 1.81 kN of C per millimetre of bore. Load balance: C0 98 kN against C 127 kN gives a 0.77 ratio, typical of a steep-angle axial-oriented design; Pu 3.9 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 150 over bore 70 is a 2.14× step for this size, and the 35 mm width gives a bore/width ratio of 2.00; use these ratios when housing space around the 70 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7314-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "One 7314-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Assign interference to the rotating ring — roughly k5 on a 70 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "At 70 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7314-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7314-BECBP?",
        "a": "7314 BECBP measures 70 mm bore × 150 mm OD × 35 mm width (2.756 × 5.906 × 1.378 in), mass about 2650 g. SKF 17000 ratings: C 127 kN, C0 98 kN, Pu 3.9 kN, reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7314-BECBP?",
        "a": "With a rotating inner ring use roughly k5 on the 70 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7314-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7314-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 143/110 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7314 BEP is the basic 70×150×35 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7314-BECBP",
      "7314 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7314-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7314 BECBPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 127,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 3.9,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7314 BECBPH is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 70×150×35 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 70×150×35 mm (2.756×5.906×1.378 in), 40.0 mm radial section height, C 127 kN, C0 98 kN, Pu 3.9 kN.reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size, catalogue mass 2650 g. Load balance: C0 98 kN against C 127 kN gives a 0.77 ratio, typical of a steep-angle axial-oriented design; Pu 3.9 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,600 r/min while thermal balance under catalogue load sets the 5,600 r/min reference; at dm ≈ 110.0 mm the corresponding dn is approximately 616k mm·r/min. Bore-to-OD planning: OD 150 over bore 70 is a 2.14× step for this size, and the 35 mm width gives a bore/width ratio of 2.00; use these ratios when housing space around the 70 mm shaft is the first constraint. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 35 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring — roughly k5 on a 70 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Assign interference to the rotating ring — roughly k5 on a 70 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7314-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7314-BECBPH?",
        "a": "7314 BECBPH measures 70 mm bore × 150 mm OD × 35 mm width (2.756 × 5.906 × 1.378 in), mass about 2650 g. SKF 17000 ratings: C 127 kN, C0 98 kN, Pu 3.9 kN, reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "Can one 7314-BECBPH take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7314-BECBPH need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7314-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7314-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 143/110 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7314 BEP is the basic 70×150×35 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7314-BECBPH",
      "7314 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7314-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7314 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 127,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 3.9,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7314 BECBY is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 70×150×35 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 70×150×35 mm (2.756×5.906×1.378 in), 40.0 mm radial section height, C 127 kN, C0 98 kN, Pu 3.9 kN.reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size, catalogue mass 2650 g. Mass and section check: 2650 g inside the 70×150×35 mm outline leaves a 40.0 mm radial section, and the 98 kN static rating is 0.77× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 98 kN against C 127 kN gives a 0.77 ratio, typical of a steep-angle axial-oriented design; Pu 3.9 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 150 over bore 70 is a 2.14× step for this size, and the 35 mm width gives a bore/width ratio of 2.00; use these ratios when housing space around the 70 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "centrifuge and separator drives",
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7314-BECBY of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Fillet radii must clear the chamfer so the 35 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7314-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7314-BECBY?",
        "a": "7314 BECBY measures 70 mm bore × 150 mm OD × 35 mm width (2.756 × 5.906 × 1.378 in), mass about 2650 g. SKF 17000 ratings: C 127 kN, C0 98 kN, Pu 3.9 kN, reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Can one 7314-BECBY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7314-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7314-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7314-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 143/110 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7314 BEP is the basic 70×150×35 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7314-BECBY",
      "7314 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7314-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7314 BEGAPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 127,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 3.9,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7314 BEGAPH is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 70×150×35 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 70×150×35 mm (2.756×5.906×1.378 in), 40.0 mm radial section height, C 127 kN, C0 98 kN, Pu 3.9 kN.reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size, catalogue mass 2650 g. Load balance: C0 98 kN against C 127 kN gives a 0.77 ratio, typical of a steep-angle axial-oriented design; Pu 3.9 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,600 r/min while thermal balance under catalogue load sets the 5,600 r/min reference; at dm ≈ 110.0 mm the corresponding dn is approximately 616k mm·r/min. Bore-to-OD planning: OD 150 over bore 70 is a 2.14× step for this size, and the 35 mm width gives a bore/width ratio of 2.00; use these ratios when housing space around the 70 mm shaft is the first constraint. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives",
      "heavy feed and take-up rolls"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7314-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7314-BEGAPH?",
        "a": "7314 BEGAPH measures 70 mm bore × 150 mm OD × 35 mm width (2.756 × 5.906 × 1.378 in), mass about 2650 g. SKF 17000 ratings: C 127 kN, C0 98 kN, Pu 3.9 kN, reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7314-BEGAPH?",
        "a": "With a rotating inner ring use roughly k5 on the 70 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7314-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7314-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 143/110 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7314 BEP is the basic 70×150×35 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7314-BEGAPH",
      "7314 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7314-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7314 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 127,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 3.9,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7314 BECBM is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 70×150×35 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 70×150×35 mm (2.756×5.906×1.378 in), 40.0 mm radial section height, C 127 kN, C0 98 kN, Pu 3.9 kN.reference speed 5,600 r/min (thermal) and limiting speed 7,000 r/min (mechanical), catalogue mass 2650 g. Envelope economics: the 35 mm width over a 40.0 mm section yields 0.88 mm of ring width per section millimetre, and the bearing weighs 2650 g for 127 kN of dynamic capacity — about 21 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 7,000 r/min while thermal balance under catalogue load sets the 5,600 r/min reference; at dm ≈ 110.0 mm the corresponding dn is approximately 770k mm·r/min. Bore-to-OD planning: OD 150 over bore 70 is a 2.14× step for this size, and the 35 mm width gives a bore/width ratio of 2.00; use these ratios when housing space around the 70 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7314-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "One 7314-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7314-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7314-BECBM?",
        "a": "7314 BECBM measures 70 mm bore × 150 mm OD × 35 mm width (2.756 × 5.906 × 1.378 in), mass about 2650 g. SKF 17000 ratings: C 127 kN, C0 98 kN, Pu 3.9 kN, reference speed 5,600 r/min (thermal) and limiting speed 7,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7314-BECBM?",
        "a": "The 5,600 r/min reference (thermal) and 7,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7314-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7314-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7314-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope with catalogue ratings within 10 %; 7314 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7314-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 143/110 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (127/98 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7314 BEP is the basic 70×150×35 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7314-BECBM",
      "7314 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7314-ACCBM",
    "brand": "SKF",
    "manufacturer_designation": "7314 ACCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 143,
    "static_load_kN": 110,
    "fatigue_load_limit_kN": 4.4,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7314 ACCBM is SKF's 70 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 25° (AC) contact angle, 70×150×35 mm to the ISO dimension plan. AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 70×150×35 mm (2.756×5.906×1.378 in), 40.0 mm radial section height, C 143 kN, C0 110 kN, Pu 4.4 kN.reference speed 6,000 r/min (thermal) and limiting speed 8,500 r/min (mechanical), catalogue mass 2650 g. Selection figures for 7314 ACCBM: the static-to-dynamic ratio C0/C is 0.77, Pu 4.4 kN is about 3 % of C, and catalogue mass works out to roughly 38 g per millimetre of bore. At the printed limiting speed of 8,500 r/min the mean pitch diameter dm ≈ 110.0 mm implies a dn value around 935k mm·r/min; the 6,000 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 6,000 r/min against a 8,500 r/min limiting speed, i.e. a reference-to-limit ratio of 0.71. High-angle alternative note: ACCBM carries the 25-degree AC contact angle (not the 40-degree B), CB Normal-clearance universal faces and a machined brass cage; it runs faster and cooler than a BECBM of the same envelope but accepts a smaller axial share, so substitute only after re-running the load-ratio check.",
    "applications": [
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives",
      "printing and paper-machine rolls"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "ball unloading when the 25-degree AC set is applied at the Fa/Fr ratios valid only for the 40-degree B design",
      "brinelling from pressing the ring home through the balls or from static overload",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 35 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of ACCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Fillet radii must clear the chamfer so the 35 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The 25° AC angle of 7314-ACCBM runs faster and cooler than a 40° B bearing of the same envelope, but its thrust capacity and induced-load behaviour differ — do not swap AC for B without re-running the axial-load calculation.",
      "Universally matchable ACCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7314-ACCBM?",
        "a": "7314 ACCBM measures 70 mm bore × 150 mm OD × 35 mm width (2.756 × 5.906 × 1.378 in), mass about 2650 g. SKF 17000 ratings: C 143 kN, C0 110 kN, Pu 4.4 kN, reference speed 6,000 r/min (thermal) and limiting speed 8,500 r/min (mechanical)."
      },
      {
        "q": "What does the ACCBM suffix mean?",
        "a": "AC sets the 25° contact angle, CB marks universal matching with Normal axial clearance, and M the machined brass ball-centred cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7314-ACCBM?",
        "a": "The 6,000 r/min reference (thermal) and 8,500 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7314-ACCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 25° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7314-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7314-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (143/110 kN vs 119/90 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7314-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (143/110 kN vs 127/98 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7314-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (143/110 kN vs 127/98 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7314-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (143/110 kN vs 127/98 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7314-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (143/110 kN vs 127/98 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7314-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (143/110 kN vs 127/98 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (143/110 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (143/110 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-314-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope, but catalogue C/C0 differ between executions (143/110 kN vs 200/180 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7314",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7314 BEP shares the 70×150×35 mm angular-contact envelope, but catalogue C/C0 differ (143/110 kN vs 119/90 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7314-ACCBM",
      "7314 ACCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7215-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7215 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 70.2,
    "static_load_kN": 60,
    "fatigue_load_limit_kN": 2.5,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7215 BEP is SKF's 75 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 75×130×25 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 75×130×25 mm (2.953×5.118×0.984 in), 27.5 mm radial section height, C 70.2 kN, C0 60 kN, Pu 2.5 kN.reference speed 6,000 r/min (thermal) and limiting speed 5,600 r/min (mechanical), catalogue mass 1200 g. Mass and section check: 1200 g inside the 75×130×25 mm outline leaves a 27.5 mm radial section, and the 60 kN static rating is 0.85× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 60 kN against C 70.2 kN gives a 0.85 ratio, typical of a steep-angle axial-oriented design; Pu 2.5 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 130 over bore 75 is a 1.73× step for this size, and the 25 mm width gives a bore/width ratio of 3.00; use these ratios when housing space around the 75 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "At 75 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7215-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7215 BEP as the single basic pa66 execution; the other order numbers of the 7215 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7215-BEP?",
        "a": "7215 BEP measures 75 mm bore × 130 mm OD × 25 mm width (2.953 × 5.118 × 0.984 in), mass about 1200 g. SKF 17000 ratings: C 70.2 kN, C0 60 kN, Pu 2.5 kN, reference speed 6,000 r/min (thermal) and limiting speed 5,600 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which grease and fill for 7215-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 5,600 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7215-BEP?",
        "a": "The 6,000 r/min reference (thermal) and 5,600 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7215-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7215-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (70.2/60 kN vs 76.5/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-215-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (70.2/60 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-215-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (70.2/60 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-215-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (70.2/60 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7215",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7215 BEP is the basic 75×130×25 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7215-BEP",
      "7215 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7215-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7215 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 65.5,
    "fatigue_load_limit_kN": 2.7,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7215 BECBM is SKF's 75 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 75×130×25 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 75×130×25 mm (2.953×5.118×0.984 in), 27.5 mm radial section height, C 73.5 kN, C0 65.5 kN, Pu 2.7 kN.reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 1200 g. Selection figures for 7215 BECBM: the static-to-dynamic ratio C0/C is 0.89, Pu 2.7 kN is about 4 % of C, and catalogue mass works out to roughly 16 g per millimetre of bore. At the printed limiting speed of 6,300 r/min the mean pitch diameter dm ≈ 102.5 mm implies a dn value around 646k mm·r/min; the 6,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 130 over bore 75 is a 1.73× step for this size, and the 25 mm width gives a bore/width ratio of 3.00; use these ratios when housing space around the 75 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7215-BECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7215-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7215-BECBM?",
        "a": "7215 BECBM measures 75 mm bore × 130 mm OD × 25 mm width (2.953 × 5.118 × 0.984 in), mass about 1200 g. SKF 17000 ratings: C 73.5 kN, C0 65.5 kN, Pu 2.7 kN, reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7215-BECBM?",
        "a": "The 6,000 r/min reference (thermal) and 6,300 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7215-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7215-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7215-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-215-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (73.5/65.5 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-215-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (73.5/65.5 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-215-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (73.5/65.5 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7215",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7215 BEP is the basic 75×130×25 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7215-BECBM",
      "7215 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7215-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7215 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 65.5,
    "fatigue_load_limit_kN": 2.7,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7215 BECBP is SKF's 75 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 75×130×25 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 75×130×25 mm (2.953×5.118×0.984 in), 27.5 mm radial section height, C 73.5 kN, C0 65.5 kN, Pu 2.7 kN.reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 1200 g. Sizing arithmetic on the 75 mm bore: 73.5 kN C divided by the 27.5 mm radial section height gives 2.7 kN per section millimetre; the 1200 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 1200 g inside the 75×130×25 mm outline leaves a 27.5 mm radial section, and the 65.5 kN static rating is 0.89× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 130 over bore 75 is a 1.73× step for this size, and the 25 mm width gives a bore/width ratio of 3.00; use these ratios when housing space around the 75 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7215-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7215-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7215-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7215-BECBP?",
        "a": "7215 BECBP measures 75 mm bore × 130 mm OD × 25 mm width (2.953 × 5.118 × 0.984 in), mass about 1200 g. SKF 17000 ratings: C 73.5 kN, C0 65.5 kN, Pu 2.7 kN, reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7215-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7215-BECBP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7215-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7215-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-215-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (73.5/65.5 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-215-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (73.5/65.5 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-215-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (73.5/65.5 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7215",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7215 BEP is the basic 75×130×25 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7215-BECBP",
      "7215 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7215-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7215 BECBPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 65.5,
    "fatigue_load_limit_kN": 2.7,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7215 BECBPH is SKF's 75 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 75×130×25 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 75×130×25 mm (2.953×5.118×0.984 in), 27.5 mm radial section height, C 73.5 kN, C0 65.5 kN, Pu 2.7 kN.reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 1200 g. Mass and section check: 1200 g inside the 75×130×25 mm outline leaves a 27.5 mm radial section, and the 65.5 kN static rating is 0.89× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 6,300 r/min the mean pitch diameter dm ≈ 102.5 mm implies a dn value around 646k mm·r/min; the 6,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 130 over bore 75 is a 1.73× step for this size, and the 25 mm width gives a bore/width ratio of 3.00; use these ratios when housing space around the 75 mm shaft is the first constraint. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7215-BECBPH of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Fillet radii must clear the chamfer so the 25 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7215-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7215-BECBPH?",
        "a": "7215 BECBPH measures 75 mm bore × 130 mm OD × 25 mm width (2.953 × 5.118 × 0.984 in), mass about 1200 g. SKF 17000 ratings: C 73.5 kN, C0 65.5 kN, Pu 2.7 kN, reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "Which grease and fill for 7215-BECBPH?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 6,300 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7215-BECBPH?",
        "a": "The 6,000 r/min reference (thermal) and 6,300 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7215-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7215-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-215-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (73.5/65.5 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-215-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (73.5/65.5 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-215-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (73.5/65.5 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7215",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7215 BEP is the basic 75×130×25 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7215-BECBPH",
      "7215 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7215-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7215 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 76.5,
    "static_load_kN": 69.5,
    "fatigue_load_limit_kN": 2.9,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7215 BECBY is SKF's 75 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 75×130×25 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 75×130×25 mm (2.953×5.118×0.984 in), 27.5 mm radial section height, C 76.5 kN, C0 69.5 kN, Pu 2.9 kN.reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 1200 g. Load balance: C0 69.5 kN against C 76.5 kN gives a 0.91 ratio, typical of a steep-angle axial-oriented design; Pu 2.9 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 1200 g inside the 75×130×25 mm outline leaves a 27.5 mm radial section, and the 69.5 kN static rating is 0.91× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 130 over bore 75 is a 1.73× step for this size, and the 25 mm width gives a bore/width ratio of 3.00; use these ratios when housing space around the 75 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "centrifuge and separator drives",
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 25 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "One 7215-BECBY locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7215-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7215-BECBY?",
        "a": "7215 BECBY measures 75 mm bore × 130 mm OD × 25 mm width (2.953 × 5.118 × 0.984 in), mass about 1200 g. SKF 17000 ratings: C 76.5 kN, C0 69.5 kN, Pu 2.9 kN, reference speed 6,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which grease and fill for 7215-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 6,300 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7215-BECBY?",
        "a": "The 6,000 r/min reference (thermal) and 6,300 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7215-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7215-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (76.5/69.5 kN vs 70.2/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7215-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7215-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope with catalogue ratings within 10 %; 7215 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-215-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (76.5/69.5 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-215-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (76.5/69.5 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-215-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope, but catalogue C/C0 differ between executions (76.5/69.5 kN vs 125/132 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7215",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7215 BEP shares the 75×130×25 mm angular-contact envelope, but catalogue C/C0 differ (76.5/69.5 kN vs 70.2/60 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7215-BECBY",
      "7215 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7315-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7315 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 125,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 3.8,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 3200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7315 BEP is SKF's 75 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 75×160×37 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 75×160×37 mm (2.953×6.299×1.457 in), 42.5 mm radial section height, C 125 kN, C0 98 kN, Pu 3.8 kN.reference speed 5,300 r/min (thermal) and limiting speed 5,000 r/min (mechanical), catalogue mass 3200 g. Selection figures for 7315 BEP: the static-to-dynamic ratio C0/C is 0.78, Pu 3.8 kN is about 3 % of C, and catalogue mass works out to roughly 43 g per millimetre of bore. Load balance: C0 98 kN against C 125 kN gives a 0.78 ratio, typical of a steep-angle axial-oriented design; Pu 3.8 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 160 over bore 75 is a 2.13× step for this size, and the 37 mm width gives a bore/width ratio of 2.03; use these ratios when housing space around the 75 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives",
      "printing and paper-machine rolls"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "At 75 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "One 7315-BEP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7315-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7315 BEP as the single basic pa66 execution; the other order numbers of the 7315 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7315-BEP?",
        "a": "7315 BEP measures 75 mm bore × 160 mm OD × 37 mm width (2.953 × 6.299 × 1.457 in), mass about 3200 g. SKF 17000 ratings: C 125 kN, C0 98 kN, Pu 3.8 kN, reference speed 5,300 r/min (thermal) and limiting speed 5,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7315-BEP?",
        "a": "The 5,300 r/min reference (thermal) and 5,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7315-BEP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7315-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-315-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope, but catalogue C/C0 differ between executions (125/98 kN vs 216/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-315-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope, but catalogue C/C0 differ between executions (125/98 kN vs 216/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7315",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7315 BEP is the basic 75×160×37 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7315-BEP",
      "7315 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7315-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7315 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 132,
    "static_load_kN": 104,
    "fatigue_load_limit_kN": 4.15,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 3200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7315 BECBP is SKF's 75 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 75×160×37 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 75×160×37 mm (2.953×6.299×1.457 in), 42.5 mm radial section height, C 132 kN, C0 104 kN, Pu 4.15 kN.reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size, catalogue mass 3200 g. Envelope economics: the 37 mm width over a 42.5 mm section yields 0.87 mm of ring width per section millimetre, and the bearing weighs 3200 g for 132 kN of dynamic capacity — about 24 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,300 r/min while thermal balance under catalogue load sets the 5,300 r/min reference; at dm ≈ 117.5 mm the corresponding dn is approximately 623k mm·r/min. Bore-to-OD planning: OD 160 over bore 75 is a 2.13× step for this size, and the 37 mm width gives a bore/width ratio of 2.03; use these ratios when housing space around the 75 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7315-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7315-BECBP?",
        "a": "7315 BECBP measures 75 mm bore × 160 mm OD × 37 mm width (2.953 × 6.299 × 1.457 in), mass about 3200 g. SKF 17000 ratings: C 132 kN, C0 104 kN, Pu 4.15 kN, reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7315-BECBP?",
        "a": "The 5,300 r/min reference (thermal) and 5,300 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7315-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7315-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-315-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope, but catalogue C/C0 differ between executions (132/104 kN vs 216/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-315-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope, but catalogue C/C0 differ between executions (132/104 kN vs 216/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7315",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7315 BEP is the basic 75×160×37 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7315-BECBP",
      "7315 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7315-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7315 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 132,
    "static_load_kN": 104,
    "fatigue_load_limit_kN": 4.15,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 3200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7315 BECBY is SKF's 75 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 75×160×37 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 75×160×37 mm (2.953×6.299×1.457 in), 42.5 mm radial section height, C 132 kN, C0 104 kN, Pu 4.15 kN.reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size, catalogue mass 3200 g. Envelope economics: the 37 mm width over a 42.5 mm section yields 0.87 mm of ring width per section millimetre, and the bearing weighs 3200 g for 132 kN of dynamic capacity — about 24 g per rated kN. Mass and section check: 3200 g inside the 75×160×37 mm outline leaves a 42.5 mm radial section, and the 104 kN static rating is 0.79× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 160 over bore 75 is a 2.13× step for this size, and the 37 mm width gives a bore/width ratio of 2.03; use these ratios when housing space around the 75 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "At 75 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Assign interference to the rotating ring — roughly k5 on a 75 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7315-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7315-BECBY?",
        "a": "7315 BECBY measures 75 mm bore × 160 mm OD × 37 mm width (2.953 × 6.299 × 1.457 in), mass about 3200 g. SKF 17000 ratings: C 132 kN, C0 104 kN, Pu 4.15 kN, reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which fits should I use for 7315-BECBY?",
        "a": "With a rotating inner ring use roughly k5 on the 75 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7315-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 5,300 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7315-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-315-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope, but catalogue C/C0 differ between executions (132/104 kN vs 216/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-315-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope, but catalogue C/C0 differ between executions (132/104 kN vs 216/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7315",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7315 BEP is the basic 75×160×37 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7315-BECBY",
      "7315 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7315-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7315 BEGAPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 132,
    "static_load_kN": 104,
    "fatigue_load_limit_kN": 4.15,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 3200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7315 BEGAPH is SKF's 75 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 75×160×37 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 75×160×37 mm (2.953×6.299×1.457 in), 42.5 mm radial section height, C 132 kN, C0 104 kN, Pu 4.15 kN.reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size, catalogue mass 3200 g. Envelope economics: the 37 mm width over a 42.5 mm section yields 0.87 mm of ring width per section millimetre, and the bearing weighs 3200 g for 132 kN of dynamic capacity — about 24 g per rated kN. Selection figures for 7315 BEGAPH: the static-to-dynamic ratio C0/C is 0.79, Pu 4.15 kN is about 3 % of C, and catalogue mass works out to roughly 43 g per millimetre of bore. Bore-to-OD planning: OD 160 over bore 75 is a 2.13× step for this size, and the 37 mm width gives a bore/width ratio of 2.03; use these ratios when housing space around the 75 mm shaft is the first constraint. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives",
      "printing and paper-machine rolls"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "One 7315-BEGAPH locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Assign interference to the rotating ring — roughly k5 on a 75 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7315-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7315-BEGAPH?",
        "a": "7315 BEGAPH measures 75 mm bore × 160 mm OD × 37 mm width (2.953 × 6.299 × 1.457 in), mass about 3200 g. SKF 17000 ratings: C 132 kN, C0 104 kN, Pu 4.15 kN, reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7315-BEGAPH?",
        "a": "The 5,300 r/min reference (thermal) and 5,300 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7315-BEGAPH take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7315-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-315-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope, but catalogue C/C0 differ between executions (132/104 kN vs 216/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-315-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope, but catalogue C/C0 differ between executions (132/104 kN vs 216/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7315",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7315 BEP is the basic 75×160×37 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7315-BEGAPH",
      "7315 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7315-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7315 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 132,
    "static_load_kN": 104,
    "fatigue_load_limit_kN": 4.15,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 3200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7315 BECBM is SKF's 75 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 75×160×37 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 75×160×37 mm (2.953×6.299×1.457 in), 42.5 mm radial section height, C 132 kN, C0 104 kN, Pu 4.15 kN.reference speed 5,300 r/min (thermal) and limiting speed 6,700 r/min (mechanical), catalogue mass 3200 g. The 4.15 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 132/104 kN ratings and 3200 g mass this execution carries about 1.76 kN of C per millimetre of bore. Load balance: C0 104 kN against C 132 kN gives a 0.79 ratio, typical of a steep-angle axial-oriented design; Pu 4.15 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 160 over bore 75 is a 2.13× step for this size, and the 37 mm width gives a bore/width ratio of 2.03; use these ratios when housing space around the 75 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7315-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7315-BECBM?",
        "a": "7315 BECBM measures 75 mm bore × 160 mm OD × 37 mm width (2.953 × 6.299 × 1.457 in), mass about 3200 g. SKF 17000 ratings: C 132 kN, C0 104 kN, Pu 4.15 kN, reference speed 5,300 r/min (thermal) and limiting speed 6,700 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7315-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7315-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7315-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7315-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope with catalogue ratings within 10 %; 7315 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-315-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope, but catalogue C/C0 differ between executions (132/104 kN vs 216/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-315-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope, but catalogue C/C0 differ between executions (132/104 kN vs 216/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7315",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7315 BEP is the basic 75×160×37 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7315-BECBM",
      "7315 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7216-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7216 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 80.6,
    "static_load_kN": 69.5,
    "fatigue_load_limit_kN": 2.8,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7216 BEP is SKF's 80 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 80×140×26 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 80×140×26 mm (3.15×5.512×1.024 in), 30.0 mm radial section height, C 80.6 kN, C0 69.5 kN, Pu 2.8 kN.reference speed 5,600 r/min (thermal) and limiting speed 5,300 r/min (mechanical), catalogue mass 1450 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,300 r/min while thermal balance under catalogue load sets the 5,600 r/min reference; at dm ≈ 110.0 mm the corresponding dn is approximately 583k mm·r/min. Sizing arithmetic on the 80 mm bore: 80.6 kN C divided by the 30.0 mm radial section height gives 2.7 kN per section millimetre; the 1450 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 5,600 r/min against a 5,300 r/min limiting speed, i.e. a reference-to-limit ratio of 1.06. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Fillet radii must clear the chamfer so the 26 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "One 7216-BEP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7216-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7216 BEP as the single basic pa66 execution; the other order numbers of the 7216 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7216-BEP?",
        "a": "7216 BEP measures 80 mm bore × 140 mm OD × 26 mm width (3.15 × 5.512 × 1.024 in), mass about 1450 g. SKF 17000 ratings: C 80.6 kN, C0 69.5 kN, Pu 2.8 kN, reference speed 5,600 r/min (thermal) and limiting speed 5,300 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What minimum axial load does 7216-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7216-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7216-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-216-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope, but catalogue C/C0 differ between executions (80.6/69.5 kN vs 146/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-216-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope, but catalogue C/C0 differ between executions (80.6/69.5 kN vs 146/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7216",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7216 BEP is the basic 80×140×26 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7216-BEP",
      "7216 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7216-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7216 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 85,
    "static_load_kN": 75,
    "fatigue_load_limit_kN": 3.05,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7216 BECBP is SKF's 80 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 80×140×26 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 80×140×26 mm (3.15×5.512×1.024 in), 30.0 mm radial section height, C 85 kN, C0 75 kN, Pu 3.05 kN.reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size, catalogue mass 1450 g. At the printed limiting speed of 5,600 r/min the mean pitch diameter dm ≈ 110.0 mm implies a dn value around 616k mm·r/min; the 5,600 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 26 mm width over a 30.0 mm section yields 0.87 mm of ring width per section millimetre, and the bearing weighs 1450 g for 85 kN of dynamic capacity — about 17 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 5,600 r/min against a 5,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "edge loading from shaft deflection or housing misalignment",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "At 80 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Do not mix execution classes inside one set: a universally matchable BECBP unit is ground for arbitrary pairing, a basic execution is not.",
      "Assign interference to the rotating ring — roughly k5 on a 80 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7216-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7216-BECBP?",
        "a": "7216 BECBP measures 80 mm bore × 140 mm OD × 26 mm width (3.15 × 5.512 × 1.024 in), mass about 1450 g. SKF 17000 ratings: C 85 kN, C0 75 kN, Pu 3.05 kN, reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7216-BECBP?",
        "a": "The 5,600 r/min reference (thermal) and 5,600 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7216-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7216-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7216-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-216-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope, but catalogue C/C0 differ between executions (85/75 kN vs 146/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-216-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope, but catalogue C/C0 differ between executions (85/75 kN vs 146/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7216",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7216 BEP is the basic 80×140×26 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7216-BECBP",
      "7216 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7216-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7216 BECBPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 85,
    "static_load_kN": 75,
    "fatigue_load_limit_kN": 3.05,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7216 BECBPH is SKF's 80 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 80×140×26 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 80×140×26 mm (3.15×5.512×1.024 in), 30.0 mm radial section height, C 85 kN, C0 75 kN, Pu 3.05 kN.reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size, catalogue mass 1450 g. At the printed limiting speed of 5,600 r/min the mean pitch diameter dm ≈ 110.0 mm implies a dn value around 616k mm·r/min; the 5,600 r/min reference speed is the thermal-planning figure under catalogue load. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,600 r/min while thermal balance under catalogue load sets the 5,600 r/min reference; at dm ≈ 110.0 mm the corresponding dn is approximately 616k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 5,600 r/min against a 5,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "centrifuge and separator drives",
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 80 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Fillet radii must clear the chamfer so the 26 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Do not mix execution classes inside one set: a universally matchable BECBPH unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7216-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7216-BECBPH?",
        "a": "7216 BECBPH measures 80 mm bore × 140 mm OD × 26 mm width (3.15 × 5.512 × 1.024 in), mass about 1450 g. SKF 17000 ratings: C 85 kN, C0 75 kN, Pu 3.05 kN, reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7216-BECBPH?",
        "a": "The 5,600 r/min reference (thermal) and 5,600 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7216-BECBPH take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7216-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7216-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-216-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope, but catalogue C/C0 differ between executions (85/75 kN vs 146/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-216-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope, but catalogue C/C0 differ between executions (85/75 kN vs 146/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7216",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7216 BEP is the basic 80×140×26 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7216-BECBPH",
      "7216 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7216-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7216 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 85,
    "static_load_kN": 75,
    "fatigue_load_limit_kN": 3.05,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7216 BECBY is SKF's 80 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 80×140×26 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 80×140×26 mm (3.15×5.512×1.024 in), 30.0 mm radial section height, C 85 kN, C0 75 kN, Pu 3.05 kN.reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size, catalogue mass 1450 g. At the printed limiting speed of 5,600 r/min the mean pitch diameter dm ≈ 110.0 mm implies a dn value around 616k mm·r/min; the 5,600 r/min reference speed is the thermal-planning figure under catalogue load. The 3.05 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 85/75 kN ratings and 1450 g mass this execution carries about 1.06 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 5,600 r/min against a 5,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "edge loading from shaft deflection or housing misalignment",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7216-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7216-BECBY?",
        "a": "7216 BECBY measures 80 mm bore × 140 mm OD × 26 mm width (3.15 × 5.512 × 1.024 in), mass about 1450 g. SKF 17000 ratings: C 85 kN, C0 75 kN, Pu 3.05 kN, reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7216-BECBY?",
        "a": "The 5,600 r/min reference (thermal) and 5,600 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7216-BECBY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7216-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7216-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-216-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope, but catalogue C/C0 differ between executions (85/75 kN vs 146/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-216-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope, but catalogue C/C0 differ between executions (85/75 kN vs 146/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7216",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7216 BEP is the basic 80×140×26 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7216-BECBY",
      "7216 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7216-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7216 BEGAPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 85,
    "static_load_kN": 75,
    "fatigue_load_limit_kN": 3.05,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7216 BEGAPH is SKF's 80 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 80×140×26 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 80×140×26 mm (3.15×5.512×1.024 in), 30.0 mm radial section height, C 85 kN, C0 75 kN, Pu 3.05 kN.reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size, catalogue mass 1450 g. At the printed limiting speed of 5,600 r/min the mean pitch diameter dm ≈ 110.0 mm implies a dn value around 616k mm·r/min; the 5,600 r/min reference speed is the thermal-planning figure under catalogue load. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,600 r/min while thermal balance under catalogue load sets the 5,600 r/min reference; at dm ≈ 110.0 mm the corresponding dn is approximately 616k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 5,600 r/min against a 5,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEGAPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEGAPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7216-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7216-BEGAPH?",
        "a": "7216 BEGAPH measures 80 mm bore × 140 mm OD × 26 mm width (3.15 × 5.512 × 1.024 in), mass about 1450 g. SKF 17000 ratings: C 85 kN, C0 75 kN, Pu 3.05 kN, reference speed 5,600 r/min (thermal) and limiting speed 5,600 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7216-BEGAPH?",
        "a": "The 5,600 r/min reference (thermal) and 5,600 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7216-BEGAPH take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7216-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7216-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-216-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope, but catalogue C/C0 differ between executions (85/75 kN vs 146/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-216-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope, but catalogue C/C0 differ between executions (85/75 kN vs 146/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7216",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7216 BEP is the basic 80×140×26 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7216-BEGAPH",
      "7216 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7216-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7216 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 85,
    "static_load_kN": 75,
    "fatigue_load_limit_kN": 3.05,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7216 BECBM is SKF's 80 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 80×140×26 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 80×140×26 mm (3.15×5.512×1.024 in), 30.0 mm radial section height, C 85 kN, C0 75 kN, Pu 3.05 kN.reference speed 5,600 r/min (thermal) and limiting speed 7,000 r/min (mechanical), catalogue mass 1450 g. Load balance: C0 75 kN against C 85 kN gives a 0.88 ratio, typical of a steep-angle axial-oriented design; Pu 3.05 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 80 mm bore: 85 kN C divided by the 30.0 mm radial section height gives 2.8 kN per section millimetre; the 1450 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 5,600 r/min against a 7,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.80. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7216-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7216-BECBM?",
        "a": "7216 BECBM measures 80 mm bore × 140 mm OD × 26 mm width (3.15 × 5.512 × 1.024 in), mass about 1450 g. SKF 17000 ratings: C 85 kN, C0 75 kN, Pu 3.05 kN, reference speed 5,600 r/min (thermal) and limiting speed 7,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7216-BECBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 7,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7216-BECBM?",
        "a": "The 5,600 r/min reference (thermal) and 7,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7216-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7216-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7216-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope with catalogue ratings within 10 %; 7216 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-216-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope, but catalogue C/C0 differ between executions (85/75 kN vs 146/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-216-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope, but catalogue C/C0 differ between executions (85/75 kN vs 146/156 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7216",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7216 BEP is the basic 80×140×26 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7216-BECBM",
      "7216 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7316-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7316 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 135,
    "static_load_kN": 110,
    "fatigue_load_limit_kN": 4.15,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 3800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7316 BEP is SKF's 80 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 80×170×39 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 80×170×39 mm (3.15×6.693×1.535 in), 45.0 mm radial section height, C 135 kN, C0 110 kN, Pu 4.15 kN.reference speed 5,000 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 3800 g. The 4.15 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 135/110 kN ratings and 3800 g mass this execution carries about 1.69 kN of C per millimetre of bore. Sizing arithmetic on the 80 mm bore: 135 kN C divided by the 45.0 mm radial section height gives 3.0 kN per section millimetre; the 3800 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 5,000 r/min against a 4,500 r/min limiting speed, i.e. a reference-to-limit ratio of 1.11. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "raceway staining from water in the lubricant during idle periods",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "At 80 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7316-BEP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7316-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7316 BEP as the single basic pa66 execution; the other order numbers of the 7316 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7316-BEP?",
        "a": "7316 BEP measures 80 mm bore × 170 mm OD × 39 mm width (3.15 × 6.693 × 1.535 in), mass about 3800 g. SKF 17000 ratings: C 135 kN, C0 110 kN, Pu 4.15 kN, reference speed 5,000 r/min (thermal) and limiting speed 4,500 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which grease and fill for 7316-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 4,500 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7316-BEP?",
        "a": "The 5,000 r/min reference (thermal) and 4,500 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7316-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-316-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope, but catalogue C/C0 differ between executions (135/110 kN vs 232/228 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-316-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope, but catalogue C/C0 differ between executions (135/110 kN vs 232/228 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7316 BEP is the basic 80×170×39 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7316-BEP",
      "7316 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7316-BEM",
    "brand": "SKF",
    "manufacturer_designation": "7316 BEM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 135,
    "static_load_kN": 110,
    "fatigue_load_limit_kN": 4.15,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 3800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7316 BEM is SKF's 80 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 80×170×39 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.. Envelope 80×170×39 mm (3.15×6.693×1.535 in), 45.0 mm radial section height, C 135 kN, C0 110 kN, Pu 4.15 kN.reference speed 5,000 r/min (thermal) and limiting speed 4,800 r/min (mechanical), catalogue mass 3800 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,800 r/min while thermal balance under catalogue load sets the 5,000 r/min reference; at dm ≈ 125.0 mm the corresponding dn is approximately 600k mm·r/min. Sizing arithmetic on the 80 mm bore: 135 kN C divided by the 45.0 mm radial section height gives 3.0 kN per section millimetre; the 3800 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 5,000 r/min against a 4,800 r/min limiting speed, i.e. a reference-to-limit ratio of 1.04. Ordering note: BEM pairs the optimized 40-degree geometry with a machined one-piece brass window cage as a basic (non-universal) single bearing; it is the brass-cage counterpart of the polymer BEP, and universally matchable positions must use the BECBM or BCBM execution instead.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BEM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "At 80 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Do not mix execution classes inside one set: a universally matchable BEM unit is ground for arbitrary pairing, a basic execution is not.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7316-BEM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7316 BEM as the single basic machined brass execution; the other order numbers of the 7316 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7316-BEM?",
        "a": "7316 BEM measures 80 mm bore × 170 mm OD × 39 mm width (3.15 × 6.693 × 1.535 in), mass about 3800 g. SKF 17000 ratings: C 135 kN, C0 110 kN, Pu 4.15 kN, reference speed 5,000 r/min (thermal) and limiting speed 4,800 r/min (mechanical)."
      },
      {
        "q": "What does the BEM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.."
      },
      {
        "q": "Which fits should I use for 7316-BEM?",
        "a": "With a rotating inner ring use roughly k5 on the 80 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7316-BEM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 4,800 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7316-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-316-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope, but catalogue C/C0 differ between executions (135/110 kN vs 232/228 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-316-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope, but catalogue C/C0 differ between executions (135/110 kN vs 232/228 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7316 BEP is the basic 80×170×39 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7316-BEM",
      "7316 BEM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7316-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7316 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 143,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 4.5,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 3800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7316 BECBP is SKF's 80 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 80×170×39 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 80×170×39 mm (3.15×6.693×1.535 in), 45.0 mm radial section height, C 143 kN, C0 118 kN, Pu 4.5 kN.reference speed 5,000 r/min (thermal) and limiting speed 5,000 r/min (mechanical), which coincide for this size, catalogue mass 3800 g. Mass and section check: 3800 g inside the 80×170×39 mm outline leaves a 45.0 mm radial section, and the 118 kN static rating is 0.83× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 4.5 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 143/118 kN ratings and 3800 g mass this execution carries about 1.79 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 5,000 r/min against a 5,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "centrifuge and separator drives",
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7316-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Fillet radii must clear the chamfer so the 39 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7316-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7316-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7316-BECBP?",
        "a": "7316 BECBP measures 80 mm bore × 170 mm OD × 39 mm width (3.15 × 6.693 × 1.535 in), mass about 3800 g. SKF 17000 ratings: C 143 kN, C0 118 kN, Pu 4.5 kN, reference speed 5,000 r/min (thermal) and limiting speed 5,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7316-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 5,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7316-BECBP?",
        "a": "The 5,000 r/min reference (thermal) and 5,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7316-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-316-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope, but catalogue C/C0 differ between executions (143/118 kN vs 232/228 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-316-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope, but catalogue C/C0 differ between executions (143/118 kN vs 232/228 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7316 BEP is the basic 80×170×39 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7316-BECBP",
      "7316 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7316-BECBPH",
    "brand": "SKF",
    "manufacturer_designation": "7316 BECBPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 143,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 4.5,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 3800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7316 BECBPH is SKF's 80 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 80×170×39 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable. Envelope 80×170×39 mm (3.15×6.693×1.535 in), 45.0 mm radial section height, C 143 kN, C0 118 kN, Pu 4.5 kN.reference speed 5,000 r/min (thermal) and limiting speed 5,000 r/min (mechanical), which coincide for this size, catalogue mass 3800 g. The 4.5 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 143/118 kN ratings and 3800 g mass this execution carries about 1.79 kN of C per millimetre of bore. Selection figures for 7316 BECBPH: the static-to-dynamic ratio C0/C is 0.83, Pu 4.5 kN is about 3 % of C, and catalogue mass works out to roughly 48 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 5,000 r/min against a 5,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. PEEK cage note: the PH cage is moulded from glass-fibre reinforced polyetheretherketone, ball-centred, aimed at high-speed oil-air and grease positions where PA66 would approach its thermal and speed limits; it needs clean lubricant (PEEK cages are sensitive to hard-particle cage-wear) and is a separate order number from the brass BECBM.",
    "applications": [
      "centrifuge and separator drives",
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear from hard particles in the lubricant, which abrade the moulded pocket surfaces",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 80 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "One 7316-BECBPH locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7316-BECBPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7316-BECBPH?",
        "a": "7316 BECBPH measures 80 mm bore × 170 mm OD × 39 mm width (3.15 × 6.693 × 1.535 in), mass about 3800 g. SKF 17000 ratings: C 143 kN, C0 118 kN, Pu 4.5 kN, reference speed 5,000 r/min (thermal) and limiting speed 5,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBPH combines CB universal clearance with a PEEK ball-centred cage for hot, high-speed positions where PA66 is unsuitable."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7316-BECBPH?",
        "a": "With a rotating inner ring use roughly k5 on the 80 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7316-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-316-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope, but catalogue C/C0 differ between executions (143/118 kN vs 232/228 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-316-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope, but catalogue C/C0 differ between executions (143/118 kN vs 232/228 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7316 BEP is the basic 80×170×39 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7316-BECBPH",
      "7316 BECBPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7316-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7316 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 143,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 4.5,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 3800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7316 BECBY is SKF's 80 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 80×170×39 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 80×170×39 mm (3.15×6.693×1.535 in), 45.0 mm radial section height, C 143 kN, C0 118 kN, Pu 4.5 kN.reference speed 5,000 r/min (thermal) and limiting speed 5,000 r/min (mechanical), which coincide for this size, catalogue mass 3800 g. Sizing arithmetic on the 80 mm bore: 143 kN C divided by the 45.0 mm radial section height gives 3.2 kN per section millimetre; the 3800 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. The 4.5 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 143/118 kN ratings and 3800 g mass this execution carries about 1.79 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 5,000 r/min against a 5,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 39 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "At 80 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7316-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7316-BECBY?",
        "a": "7316 BECBY measures 80 mm bore × 170 mm OD × 39 mm width (3.15 × 6.693 × 1.535 in), mass about 3800 g. SKF 17000 ratings: C 143 kN, C0 118 kN, Pu 4.5 kN, reference speed 5,000 r/min (thermal) and limiting speed 5,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which grease and fill for 7316-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 5,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7316-BECBY?",
        "a": "The 5,000 r/min reference (thermal) and 5,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7316-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-316-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope, but catalogue C/C0 differ between executions (143/118 kN vs 232/228 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-316-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope, but catalogue C/C0 differ between executions (143/118 kN vs 232/228 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7316 BEP is the basic 80×170×39 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7316-BECBY",
      "7316 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7316-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7316 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 143,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 4.5,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 3800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7316 BECBM is SKF's 80 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 80×170×39 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 80×170×39 mm (3.15×6.693×1.535 in), 45.0 mm radial section height, C 143 kN, C0 118 kN, Pu 4.5 kN.reference speed 5,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 3800 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 6,300 r/min while thermal balance under catalogue load sets the 5,000 r/min reference; at dm ≈ 125.0 mm the corresponding dn is approximately 788k mm·r/min. Selection figures for 7316 BECBM: the static-to-dynamic ratio C0/C is 0.83, Pu 4.5 kN is about 3 % of C, and catalogue mass works out to roughly 48 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 5,000 r/min against a 6,300 r/min limiting speed, i.e. a reference-to-limit ratio of 0.79. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "One 7316-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "At 80 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Fillet radii must clear the chamfer so the 39 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7316-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7316-BECBM?",
        "a": "7316 BECBM measures 80 mm bore × 170 mm OD × 39 mm width (3.15 × 6.693 × 1.535 in), mass about 3800 g. SKF 17000 ratings: C 143 kN, C0 118 kN, Pu 4.5 kN, reference speed 5,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7316-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7316-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7316-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope with catalogue ratings within 10 %; 7316 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-316-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope, but catalogue C/C0 differ between executions (143/118 kN vs 232/228 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-316-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope, but catalogue C/C0 differ between executions (143/118 kN vs 232/228 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7316 BEP is the basic 80×170×39 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7316-BECBM",
      "7316 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7217-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7217 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 95.6,
    "static_load_kN": 83,
    "fatigue_load_limit_kN": 3.25,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 1850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7217 BEP is SKF's 85 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 85×150×28 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 85×150×28 mm (3.346×5.906×1.102 in), 32.5 mm radial section height, C 95.6 kN, C0 83 kN, Pu 3.25 kN.reference speed 5,300 r/min (thermal) and limiting speed 5,000 r/min (mechanical), catalogue mass 1850 g. Sizing arithmetic on the 85 mm bore: 95.6 kN C divided by the 32.5 mm radial section height gives 2.9 kN per section millimetre; the 1850 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. The 3.25 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 95.6/83 kN ratings and 1850 g mass this execution carries about 1.12 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 5,300 r/min against a 5,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.06. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 28 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7217-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7217 BEP as the single basic pa66 execution; the other order numbers of the 7217 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7217-BEP?",
        "a": "7217 BEP measures 85 mm bore × 150 mm OD × 28 mm width (3.346 × 5.906 × 1.102 in), mass about 1850 g. SKF 17000 ratings: C 95.6 kN, C0 83 kN, Pu 3.25 kN, reference speed 5,300 r/min (thermal) and limiting speed 5,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which grease and fill for 7217-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 5,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7217-BEP?",
        "a": "The 5,300 r/min reference (thermal) and 5,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7217-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7217-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope with catalogue ratings within 10 %; 7217 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7217-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope with catalogue ratings within 10 %; 7217 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7217-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope with catalogue ratings within 10 %; 7217 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-217-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope, but catalogue C/C0 differ between executions (95.6/83 kN vs 156/173 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-217-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope, but catalogue C/C0 differ between executions (95.6/83 kN vs 156/173 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7217",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7217 BEP is the basic 85×150×28 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7217-BEP",
      "7217 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7217-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7217 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 102,
    "static_load_kN": 90,
    "fatigue_load_limit_kN": 3.55,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 1850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7217 BECBP is SKF's 85 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 85×150×28 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 85×150×28 mm (3.346×5.906×1.102 in), 32.5 mm radial section height, C 102 kN, C0 90 kN, Pu 3.55 kN.reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size, catalogue mass 1850 g. Load balance: C0 90 kN against C 102 kN gives a 0.88 ratio, typical of a steep-angle axial-oriented design; Pu 3.55 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 85 mm bore: 102 kN C divided by the 32.5 mm radial section height gives 3.1 kN per section millimetre; the 1850 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 5,300 r/min against a 5,300 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "One 7217-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "One 7217-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Assign interference to the rotating ring — roughly k5 on a 85 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7217-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7217-BECBP?",
        "a": "7217 BECBP measures 85 mm bore × 150 mm OD × 28 mm width (3.346 × 5.906 × 1.102 in), mass about 1850 g. SKF 17000 ratings: C 102 kN, C0 90 kN, Pu 3.55 kN, reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7217-BECBP?",
        "a": "With a rotating inner ring use roughly k5 on the 85 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7217-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7217-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope with catalogue ratings within 10 %; 7217 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7217-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope with catalogue ratings within 10 %; 7217 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7217-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope with catalogue ratings within 10 %; 7217 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-217-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope, but catalogue C/C0 differ between executions (102/90 kN vs 156/173 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-217-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope, but catalogue C/C0 differ between executions (102/90 kN vs 156/173 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7217",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7217 BEP is the basic 85×150×28 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7217-BECBP",
      "7217 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7217-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7217 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 102,
    "static_load_kN": 90,
    "fatigue_load_limit_kN": 3.55,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 1850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7217 BECBY is SKF's 85 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 85×150×28 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 85×150×28 mm (3.346×5.906×1.102 in), 32.5 mm radial section height, C 102 kN, C0 90 kN, Pu 3.55 kN.reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size, catalogue mass 1850 g. The 3.55 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 102/90 kN ratings and 1850 g mass this execution carries about 1.20 kN of C per millimetre of bore. Sizing arithmetic on the 85 mm bore: 102 kN C divided by the 32.5 mm radial section height gives 3.1 kN per section millimetre; the 1850 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 5,300 r/min against a 5,300 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "centrifuge and separator drives",
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "raceway staining from water in the lubricant during idle periods",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7217-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7217-BECBY?",
        "a": "7217 BECBY measures 85 mm bore × 150 mm OD × 28 mm width (3.346 × 5.906 × 1.102 in), mass about 1850 g. SKF 17000 ratings: C 102 kN, C0 90 kN, Pu 3.55 kN, reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which grease and fill for 7217-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 5,300 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7217-BECBY?",
        "a": "The 5,300 r/min reference (thermal) and 5,300 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7217-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7217-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope with catalogue ratings within 10 %; 7217 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7217-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope with catalogue ratings within 10 %; 7217 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7217-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope with catalogue ratings within 10 %; 7217 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-217-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope, but catalogue C/C0 differ between executions (102/90 kN vs 156/173 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-217-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope, but catalogue C/C0 differ between executions (102/90 kN vs 156/173 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7217",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7217 BEP is the basic 85×150×28 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7217-BECBY",
      "7217 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7217-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7217 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 102,
    "static_load_kN": 90,
    "fatigue_load_limit_kN": 3.55,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 1850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7217 BECBM is SKF's 85 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 85×150×28 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 85×150×28 mm (3.346×5.906×1.102 in), 32.5 mm radial section height, C 102 kN, C0 90 kN, Pu 3.55 kN.reference speed 5,300 r/min (thermal) and limiting speed 6,700 r/min (mechanical), catalogue mass 1850 g. At the printed limiting speed of 6,700 r/min the mean pitch diameter dm ≈ 117.5 mm implies a dn value around 787k mm·r/min; the 5,300 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 28 mm width over a 32.5 mm section yields 0.86 mm of ring width per section millimetre, and the bearing weighs 1850 g for 102 kN of dynamic capacity — about 18 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 5,300 r/min against a 6,700 r/min limiting speed, i.e. a reference-to-limit ratio of 0.79. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives",
      "heavy feed and take-up rolls"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "edge loading from shaft deflection or housing misalignment",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 28 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Assign interference to the rotating ring — roughly k5 on a 85 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "At 85 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7217-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7217-BECBM?",
        "a": "7217 BECBM measures 85 mm bore × 150 mm OD × 28 mm width (3.346 × 5.906 × 1.102 in), mass about 1850 g. SKF 17000 ratings: C 102 kN, C0 90 kN, Pu 3.55 kN, reference speed 5,300 r/min (thermal) and limiting speed 6,700 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7217-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7217-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7217-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope with catalogue ratings within 10 %; 7217 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7217-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope with catalogue ratings within 10 %; 7217 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7217-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope with catalogue ratings within 10 %; 7217 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-217-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope, but catalogue C/C0 differ between executions (102/90 kN vs 156/173 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-217-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope, but catalogue C/C0 differ between executions (102/90 kN vs 156/173 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7217",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7217 BEP is the basic 85×150×28 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7217-BECBM",
      "7217 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7317-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7317 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 146,
    "static_load_kN": 122,
    "fatigue_load_limit_kN": 4.5,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7317 BEP is SKF's 85 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 85×180×41 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 85×180×41 mm (3.346×7.087×1.614 in), 47.5 mm radial section height, C 146 kN, C0 122 kN, Pu 4.5 kN.reference speed 4,500 r/min (thermal) and limiting speed 4,300 r/min (mechanical), catalogue mass 4450 g. At the printed limiting speed of 4,300 r/min the mean pitch diameter dm ≈ 132.5 mm implies a dn value around 570k mm·r/min; the 4,500 r/min reference speed is the thermal-planning figure under catalogue load. The 4.5 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 146/122 kN ratings and 4450 g mass this execution carries about 1.72 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 4,500 r/min against a 4,300 r/min limiting speed, i.e. a reference-to-limit ratio of 1.05. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "edge loading from shaft deflection or housing misalignment",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 85 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7317-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7317 BEP as the single basic pa66 execution; the other order numbers of the 7317 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7317-BEP?",
        "a": "7317 BEP measures 85 mm bore × 180 mm OD × 41 mm width (3.346 × 7.087 × 1.614 in), mass about 4450 g. SKF 17000 ratings: C 146 kN, C0 122 kN, Pu 4.5 kN, reference speed 4,500 r/min (thermal) and limiting speed 4,300 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7317-BEP?",
        "a": "The 4,500 r/min reference (thermal) and 4,300 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7317-BEP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7317-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7317-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-317-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope, but catalogue C/C0 differ between executions (146/122 kN vs 250/255 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7317 BEP is the basic 85×180×41 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7317-BEP",
      "7317 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7317-BEM",
    "brand": "SKF",
    "manufacturer_designation": "7317 BEM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 146,
    "static_load_kN": 122,
    "fatigue_load_limit_kN": 4.5,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7317 BEM is SKF's 85 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 85×180×41 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.. Envelope 85×180×41 mm (3.346×7.087×1.614 in), 47.5 mm radial section height, C 146 kN, C0 122 kN, Pu 4.5 kN.reference speed 4,500 r/min (thermal) and limiting speed 4,500 r/min (mechanical), which coincide for this size, catalogue mass 4450 g. Sizing arithmetic on the 85 mm bore: 146 kN C divided by the 47.5 mm radial section height gives 3.1 kN per section millimetre; the 4450 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. The 4.5 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 146/122 kN ratings and 4450 g mass this execution carries about 1.72 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 4,500 r/min against a 4,500 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Ordering note: BEM pairs the optimized 40-degree geometry with a machined one-piece brass window cage as a basic (non-universal) single bearing; it is the brass-cage counterpart of the polymer BEP, and universally matchable positions must use the BECBM or BCBM execution instead.",
    "applications": [
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BEM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "At 85 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7317-BEM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7317 BEM as the single basic machined brass execution; the other order numbers of the 7317 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7317-BEM?",
        "a": "7317 BEM measures 85 mm bore × 180 mm OD × 41 mm width (3.346 × 7.087 × 1.614 in), mass about 4450 g. SKF 17000 ratings: C 146 kN, C0 122 kN, Pu 4.5 kN, reference speed 4,500 r/min (thermal) and limiting speed 4,500 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7317-BEM?",
        "a": "With a rotating inner ring use roughly k5 on the 85 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7317-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7317-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-317-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope, but catalogue C/C0 differ between executions (146/122 kN vs 250/255 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7317 BEP is the basic 85×180×41 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7317-BEM",
      "7317 BEM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7317-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7317 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 156,
    "static_load_kN": 132,
    "fatigue_load_limit_kN": 4.9,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7317 BECBP is SKF's 85 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 85×180×41 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 85×180×41 mm (3.346×7.087×1.614 in), 47.5 mm radial section height, C 156 kN, C0 132 kN, Pu 4.9 kN.reference speed 4,500 r/min (thermal) and limiting speed 4,800 r/min (mechanical), catalogue mass 4450 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,800 r/min while thermal balance under catalogue load sets the 4,500 r/min reference; at dm ≈ 132.5 mm the corresponding dn is approximately 636k mm·r/min. Selection figures for 7317 BECBP: the static-to-dynamic ratio C0/C is 0.85, Pu 4.9 kN is about 3 % of C, and catalogue mass works out to roughly 52 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 4,500 r/min against a 4,800 r/min limiting speed, i.e. a reference-to-limit ratio of 0.94. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7317-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7317-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7317-BECBP?",
        "a": "7317 BECBP measures 85 mm bore × 180 mm OD × 41 mm width (3.346 × 7.087 × 1.614 in), mass about 4450 g. SKF 17000 ratings: C 156 kN, C0 132 kN, Pu 4.9 kN, reference speed 4,500 r/min (thermal) and limiting speed 4,800 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7317-BECBP?",
        "a": "The 4,500 r/min reference (thermal) and 4,800 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7317-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7317-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7317-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-317-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope, but catalogue C/C0 differ between executions (156/132 kN vs 250/255 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7317 BEP is the basic 85×180×41 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7317-BECBP",
      "7317 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7317-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7317 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 156,
    "static_load_kN": 132,
    "fatigue_load_limit_kN": 4.9,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7317 BECBY is SKF's 85 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 85×180×41 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 85×180×41 mm (3.346×7.087×1.614 in), 47.5 mm radial section height, C 156 kN, C0 132 kN, Pu 4.9 kN.reference speed 4,500 r/min (thermal) and limiting speed 4,800 r/min (mechanical), catalogue mass 4450 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,800 r/min while thermal balance under catalogue load sets the 4,500 r/min reference; at dm ≈ 132.5 mm the corresponding dn is approximately 636k mm·r/min. Sizing arithmetic on the 85 mm bore: 156 kN C divided by the 47.5 mm radial section height gives 3.3 kN per section millimetre; the 4450 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 4,500 r/min against a 4,800 r/min limiting speed, i.e. a reference-to-limit ratio of 0.94. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7317-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7317-BECBY?",
        "a": "7317 BECBY measures 85 mm bore × 180 mm OD × 41 mm width (3.346 × 7.087 × 1.614 in), mass about 4450 g. SKF 17000 ratings: C 156 kN, C0 132 kN, Pu 4.9 kN, reference speed 4,500 r/min (thermal) and limiting speed 4,800 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7317-BECBY?",
        "a": "The 4,500 r/min reference (thermal) and 4,800 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7317-BECBY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7317-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7317-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-317-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope, but catalogue C/C0 differ between executions (156/132 kN vs 250/255 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7317 BEP is the basic 85×180×41 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7317-BECBY",
      "7317 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7317-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7317 BEGAPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 156,
    "static_load_kN": 132,
    "fatigue_load_limit_kN": 4.9,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7317 BEGAPH is SKF's 85 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 85×180×41 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 85×180×41 mm (3.346×7.087×1.614 in), 47.5 mm radial section height, C 156 kN, C0 132 kN, Pu 4.9 kN.reference speed 4,500 r/min (thermal) and limiting speed 4,800 r/min (mechanical), catalogue mass 4450 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,800 r/min while thermal balance under catalogue load sets the 4,500 r/min reference; at dm ≈ 132.5 mm the corresponding dn is approximately 636k mm·r/min. At the printed limiting speed of 4,800 r/min the mean pitch diameter dm ≈ 132.5 mm implies a dn value around 636k mm·r/min; the 4,500 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 4,500 r/min against a 4,800 r/min limiting speed, i.e. a reference-to-limit ratio of 0.94. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "centrifuge and separator drives",
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "One 7317-BEGAPH locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEGAPH establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Assign interference to the rotating ring — roughly k5 on a 85 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7317-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7317-BEGAPH?",
        "a": "7317 BEGAPH measures 85 mm bore × 180 mm OD × 41 mm width (3.346 × 7.087 × 1.614 in), mass about 4450 g. SKF 17000 ratings: C 156 kN, C0 132 kN, Pu 4.9 kN, reference speed 4,500 r/min (thermal) and limiting speed 4,800 r/min (mechanical)."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7317-BEGAPH?",
        "a": "The 4,500 r/min reference (thermal) and 4,800 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7317-BEGAPH take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7317-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7317-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-317-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope, but catalogue C/C0 differ between executions (156/132 kN vs 250/255 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7317 BEP is the basic 85×180×41 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7317-BEGAPH",
      "7317 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7317-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7317 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 156,
    "static_load_kN": 132,
    "fatigue_load_limit_kN": 4.9,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7317 BECBM is SKF's 85 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 85×180×41 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 85×180×41 mm (3.346×7.087×1.614 in), 47.5 mm radial section height, C 156 kN, C0 132 kN, Pu 4.9 kN.reference speed 4,500 r/min (thermal) and limiting speed 6,000 r/min (mechanical), catalogue mass 4450 g. Mass and section check: 4450 g inside the 85×180×41 mm outline leaves a 47.5 mm radial section, and the 132 kN static rating is 0.85× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 4.9 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 156/132 kN ratings and 4450 g mass this execution carries about 1.84 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 4,500 r/min against a 6,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.75. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 41 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7317-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7317-BECBM?",
        "a": "7317 BECBM measures 85 mm bore × 180 mm OD × 41 mm width (3.346 × 7.087 × 1.614 in), mass about 4450 g. SKF 17000 ratings: C 156 kN, C0 132 kN, Pu 4.9 kN, reference speed 4,500 r/min (thermal) and limiting speed 6,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7317-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7317-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7317-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7317-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7317-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope with catalogue ratings within 10 %; 7317 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-317-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope, but catalogue C/C0 differ between executions (156/132 kN vs 250/255 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7317 BEP is the basic 85×180×41 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7317-BECBM",
      "7317 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7218-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7218 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 108,
    "static_load_kN": 96.5,
    "fatigue_load_limit_kN": 3.65,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7218 BEP is SKF's 90 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 90×160×30 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 90×160×30 mm (3.543×6.299×1.181 in), 35.0 mm radial section height, C 108 kN, C0 96.5 kN, Pu 3.65 kN.reference speed 5,000 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 2300 g. Selection figures for 7218 BEP: the static-to-dynamic ratio C0/C is 0.89, Pu 3.65 kN is about 3 % of C, and catalogue mass works out to roughly 26 g per millimetre of bore. Load balance: C0 96.5 kN against C 108 kN gives a 0.89 ratio, typical of a steep-angle axial-oriented design; Pu 3.65 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 160 over bore 90 is a 1.78× step for this size, and the 30 mm width gives a bore/width ratio of 3.00; use these ratios when housing space around the 90 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 90 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7218-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7218 BEP as the single basic pa66 execution; the other order numbers of the 7218 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7218-BEP?",
        "a": "7218 BEP measures 90 mm bore × 160 mm OD × 30 mm width (3.543 × 6.299 × 1.181 in), mass about 2300 g. SKF 17000 ratings: C 108 kN, C0 96.5 kN, Pu 3.65 kN, reference speed 5,000 r/min (thermal) and limiting speed 4,500 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which fits should I use for 7218-BEP?",
        "a": "With a rotating inner ring use roughly k5 on the 90 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7218-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 4,500 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7218-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7218-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope with catalogue ratings within 10 %; 7218 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7218-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope with catalogue ratings within 10 %; 7218 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7218-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope with catalogue ratings within 10 %; 7218 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-218-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope, but catalogue C/C0 differ between executions (108/96.5 kN vs 186/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7218",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7218 BEP is the basic 90×160×30 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7218-BEP",
      "7218 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7218-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7218 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 116,
    "static_load_kN": 104,
    "fatigue_load_limit_kN": 4,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7218 BECBP is SKF's 90 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 90×160×30 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 90×160×30 mm (3.543×6.299×1.181 in), 35.0 mm radial section height, C 116 kN, C0 104 kN, Pu 4 kN.reference speed 5,000 r/min (thermal) and limiting speed 5,000 r/min (mechanical), which coincide for this size, catalogue mass 2300 g. Envelope economics: the 30 mm width over a 35.0 mm section yields 0.86 mm of ring width per section millimetre, and the bearing weighs 2300 g for 116 kN of dynamic capacity — about 20 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,000 r/min while thermal balance under catalogue load sets the 5,000 r/min reference; at dm ≈ 125.0 mm the corresponding dn is approximately 625k mm·r/min. Bore-to-OD planning: OD 160 over bore 90 is a 1.78× step for this size, and the 30 mm width gives a bore/width ratio of 3.00; use these ratios when housing space around the 90 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BECBP unit is ground for arbitrary pairing, a basic execution is not.",
      "Do not mix execution classes inside one set: a universally matchable BECBP unit is ground for arbitrary pairing, a basic execution is not.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Fillet radii must clear the chamfer so the 30 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7218-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7218-BECBP?",
        "a": "7218 BECBP measures 90 mm bore × 160 mm OD × 30 mm width (3.543 × 6.299 × 1.181 in), mass about 2300 g. SKF 17000 ratings: C 116 kN, C0 104 kN, Pu 4 kN, reference speed 5,000 r/min (thermal) and limiting speed 5,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7218-BECBP?",
        "a": "The 5,000 r/min reference (thermal) and 5,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7218-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7218-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7218-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope with catalogue ratings within 10 %; 7218 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7218-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope with catalogue ratings within 10 %; 7218 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7218-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope with catalogue ratings within 10 %; 7218 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-218-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope, but catalogue C/C0 differ between executions (116/104 kN vs 186/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7218",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7218 BEP is the basic 90×160×30 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7218-BECBP",
      "7218 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7218-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7218 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 116,
    "static_load_kN": 104,
    "fatigue_load_limit_kN": 4,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7218 BECBY is SKF's 90 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 90×160×30 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 90×160×30 mm (3.543×6.299×1.181 in), 35.0 mm radial section height, C 116 kN, C0 104 kN, Pu 4 kN.reference speed 5,000 r/min (thermal) and limiting speed 5,000 r/min (mechanical), which coincide for this size, catalogue mass 2300 g. Envelope economics: the 30 mm width over a 35.0 mm section yields 0.86 mm of ring width per section millimetre, and the bearing weighs 2300 g for 116 kN of dynamic capacity — about 20 g per rated kN. Mass and section check: 2300 g inside the 90×160×30 mm outline leaves a 35.0 mm radial section, and the 104 kN static rating is 0.90× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 160 over bore 90 is a 1.78× step for this size, and the 30 mm width gives a bore/width ratio of 3.00; use these ratios when housing space around the 90 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "At 90 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7218-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7218-BECBY?",
        "a": "7218 BECBY measures 90 mm bore × 160 mm OD × 30 mm width (3.543 × 6.299 × 1.181 in), mass about 2300 g. SKF 17000 ratings: C 116 kN, C0 104 kN, Pu 4 kN, reference speed 5,000 r/min (thermal) and limiting speed 5,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7218-BECBY?",
        "a": "The 5,000 r/min reference (thermal) and 5,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7218-BECBY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7218-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7218-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope with catalogue ratings within 10 %; 7218 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7218-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope with catalogue ratings within 10 %; 7218 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7218-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope with catalogue ratings within 10 %; 7218 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-218-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope, but catalogue C/C0 differ between executions (116/104 kN vs 186/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7218",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7218 BEP is the basic 90×160×30 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7218-BECBY",
      "7218 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7218-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7218 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 116,
    "static_load_kN": 104,
    "fatigue_load_limit_kN": 4,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7218 BECBM is SKF's 90 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 90×160×30 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 90×160×30 mm (3.543×6.299×1.181 in), 35.0 mm radial section height, C 116 kN, C0 104 kN, Pu 4 kN.reference speed 5,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 2300 g. The 4 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 116/104 kN ratings and 2300 g mass this execution carries about 1.29 kN of C per millimetre of bore. Load balance: C0 104 kN against C 116 kN gives a 0.90 ratio, typical of a steep-angle axial-oriented design; Pu 4 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 160 over bore 90 is a 1.78× step for this size, and the 30 mm width gives a bore/width ratio of 3.00; use these ratios when housing space around the 90 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Assign interference to the rotating ring — roughly k5 on a 90 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7218-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7218-BECBM?",
        "a": "7218 BECBM measures 90 mm bore × 160 mm OD × 30 mm width (3.543 × 6.299 × 1.181 in), mass about 2300 g. SKF 17000 ratings: C 116 kN, C0 104 kN, Pu 4 kN, reference speed 5,000 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7218-BECBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 6,300 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7218-BECBM?",
        "a": "The 5,000 r/min reference (thermal) and 6,300 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7218-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7218-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope with catalogue ratings within 10 %; 7218 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7218-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope with catalogue ratings within 10 %; 7218 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7218-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope with catalogue ratings within 10 %; 7218 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-218-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope, but catalogue C/C0 differ between executions (116/104 kN vs 186/200 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7218",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7218 BEP is the basic 90×160×30 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7218-BECBM",
      "7218 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7318-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7318 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 156,
    "static_load_kN": 134,
    "fatigue_load_limit_kN": 4.8,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 5200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7318 BEP is SKF's 90 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 90×190×43 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 90×190×43 mm (3.543×7.48×1.693 in), 50.0 mm radial section height, C 156 kN, C0 134 kN, Pu 4.8 kN.reference speed 4,300 r/min (thermal) and limiting speed 4,000 r/min (mechanical), catalogue mass 5200 g. Mass and section check: 5200 g inside the 90×190×43 mm outline leaves a 50.0 mm radial section, and the 134 kN static rating is 0.86× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 134 kN against C 156 kN gives a 0.86 ratio, typical of a steep-angle axial-oriented design; Pu 4.8 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 190 over bore 90 is a 2.11× step for this size, and the 43 mm width gives a bore/width ratio of 2.09; use these ratios when housing space around the 90 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 90 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Assign interference to the rotating ring — roughly k5 on a 90 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7318-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7318 BEP as the single basic pa66 execution; the other order numbers of the 7318 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7318-BEP?",
        "a": "7318 BEP measures 90 mm bore × 190 mm OD × 43 mm width (3.543 × 7.48 × 1.693 in), mass about 5200 g. SKF 17000 ratings: C 156 kN, C0 134 kN, Pu 4.8 kN, reference speed 4,300 r/min (thermal) and limiting speed 4,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Can one 7318-BEP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7318-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7318-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-318-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope, but catalogue C/C0 differ between executions (156/134 kN vs 285/305 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-318-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope, but catalogue C/C0 differ between executions (156/134 kN vs 285/305 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7318 BEP is the basic 90×190×43 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7318-BEP",
      "7318 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7318-BEM",
    "brand": "SKF",
    "manufacturer_designation": "7318 BEM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 156,
    "static_load_kN": 134,
    "fatigue_load_limit_kN": 4.8,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 5200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7318 BEM is SKF's 90 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 90×190×43 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.. Envelope 90×190×43 mm (3.543×7.48×1.693 in), 50.0 mm radial section height, C 156 kN, C0 134 kN, Pu 4.8 kN.reference speed 4,300 r/min (thermal) and limiting speed 4,300 r/min (mechanical), which coincide for this size, catalogue mass 5200 g. Selection figures for 7318 BEM: the static-to-dynamic ratio C0/C is 0.86, Pu 4.8 kN is about 3 % of C, and catalogue mass works out to roughly 58 g per millimetre of bore. Load balance: C0 134 kN against C 156 kN gives a 0.86 ratio, typical of a steep-angle axial-oriented design; Pu 4.8 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 190 over bore 90 is a 2.11× step for this size, and the 43 mm width gives a bore/width ratio of 2.09; use these ratios when housing space around the 90 mm shaft is the first constraint. Ordering note: BEM pairs the optimized 40-degree geometry with a machined one-piece brass window cage as a basic (non-universal) single bearing; it is the brass-cage counterpart of the polymer BEP, and universally matchable positions must use the BECBM or BCBM execution instead.",
    "applications": [
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BEM unit is ground for arbitrary pairing, a basic execution is not.",
      "Assign interference to the rotating ring — roughly k5 on a 90 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "At 90 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7318-BEM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7318 BEM as the single basic machined brass execution; the other order numbers of the 7318 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7318-BEM?",
        "a": "7318 BEM measures 90 mm bore × 190 mm OD × 43 mm width (3.543 × 7.48 × 1.693 in), mass about 5200 g. SKF 17000 ratings: C 156 kN, C0 134 kN, Pu 4.8 kN, reference speed 4,300 r/min (thermal) and limiting speed 4,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.."
      },
      {
        "q": "Which fits should I use for 7318-BEM?",
        "a": "With a rotating inner ring use roughly k5 on the 90 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7318-BEM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 4,300 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7318-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-318-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope, but catalogue C/C0 differ between executions (156/134 kN vs 285/305 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-318-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope, but catalogue C/C0 differ between executions (156/134 kN vs 285/305 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7318 BEP is the basic 90×190×43 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7318-BEM",
      "7318 BEM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7318-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7318 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 166,
    "static_load_kN": 146,
    "fatigue_load_limit_kN": 5.3,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 5200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7318 BECBP is SKF's 90 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 90×190×43 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 90×190×43 mm (3.543×7.48×1.693 in), 50.0 mm radial section height, C 166 kN, C0 146 kN, Pu 5.3 kN.reference speed 4,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 5200 g. Sizing arithmetic on the 90 mm bore: 166 kN C divided by the 50.0 mm radial section height gives 3.3 kN per section millimetre; the 5200 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 5200 g inside the 90×190×43 mm outline leaves a 50.0 mm radial section, and the 146 kN static rating is 0.88× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 190 over bore 90 is a 2.11× step for this size, and the 43 mm width gives a bore/width ratio of 2.09; use these ratios when housing space around the 90 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 43 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7318-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Fillet radii must clear the chamfer so the 43 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7318-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7318-BECBP?",
        "a": "7318 BECBP measures 90 mm bore × 190 mm OD × 43 mm width (3.543 × 7.48 × 1.693 in), mass about 5200 g. SKF 17000 ratings: C 166 kN, C0 146 kN, Pu 5.3 kN, reference speed 4,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7318-BECBP?",
        "a": "With a rotating inner ring use roughly k5 on the 90 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7318-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-318-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope, but catalogue C/C0 differ between executions (166/146 kN vs 285/305 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-318-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope, but catalogue C/C0 differ between executions (166/146 kN vs 285/305 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7318 BEP is the basic 90×190×43 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7318-BECBP",
      "7318 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7318-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7318 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 166,
    "static_load_kN": 146,
    "fatigue_load_limit_kN": 5.3,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 5200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7318 BECBY is SKF's 90 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 90×190×43 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 90×190×43 mm (3.543×7.48×1.693 in), 50.0 mm radial section height, C 166 kN, C0 146 kN, Pu 5.3 kN.reference speed 4,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 5200 g. Load balance: C0 146 kN against C 166 kN gives a 0.88 ratio, typical of a steep-angle axial-oriented design; Pu 5.3 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 5200 g inside the 90×190×43 mm outline leaves a 50.0 mm radial section, and the 146 kN static rating is 0.88× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 190 over bore 90 is a 2.11× step for this size, and the 43 mm width gives a bore/width ratio of 2.09; use these ratios when housing space around the 90 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "One 7318-BECBY locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "At 90 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Fillet radii must clear the chamfer so the 43 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7318-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7318-BECBY?",
        "a": "7318 BECBY measures 90 mm bore × 190 mm OD × 43 mm width (3.543 × 7.48 × 1.693 in), mass about 5200 g. SKF 17000 ratings: C 166 kN, C0 146 kN, Pu 5.3 kN, reference speed 4,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which grease and fill for 7318-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 4,500 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7318-BECBY?",
        "a": "The 4,300 r/min reference (thermal) and 4,500 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7318-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-318-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope, but catalogue C/C0 differ between executions (166/146 kN vs 285/305 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-318-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope, but catalogue C/C0 differ between executions (166/146 kN vs 285/305 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7318 BEP is the basic 90×190×43 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7318-BECBY",
      "7318 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7318-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7318 BEGAPH",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 166,
    "static_load_kN": 146,
    "fatigue_load_limit_kN": 5.3,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 5200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7318 BEGAPH is SKF's 90 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 90×190×43 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 90×190×43 mm (3.543×7.48×1.693 in), 50.0 mm radial section height, C 166 kN, C0 146 kN, Pu 5.3 kN.reference speed 4,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 5200 g. Mass and section check: 5200 g inside the 90×190×43 mm outline leaves a 50.0 mm radial section, and the 146 kN static rating is 0.88× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 4,500 r/min the mean pitch diameter dm ≈ 140.0 mm implies a dn value around 630k mm·r/min; the 4,300 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 190 over bore 90 is a 2.11× step for this size, and the 43 mm width gives a bore/width ratio of 2.09; use these ratios when housing space around the 90 mm shaft is the first constraint. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "centrifuge and separator drives",
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "One 7318-BEGAPH locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Assign interference to the rotating ring — roughly k5 on a 90 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7318-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7318-BEGAPH?",
        "a": "7318 BEGAPH measures 90 mm bore × 190 mm OD × 43 mm width (3.543 × 7.48 × 1.693 in), mass about 5200 g. SKF 17000 ratings: C 166 kN, C0 146 kN, Pu 5.3 kN, reference speed 4,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical)."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "Which grease and fill for 7318-BEGAPH?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 4,500 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7318-BEGAPH?",
        "a": "The 4,300 r/min reference (thermal) and 4,500 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7318-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-318-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope, but catalogue C/C0 differ between executions (166/146 kN vs 285/305 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-318-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope, but catalogue C/C0 differ between executions (166/146 kN vs 285/305 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7318 BEP is the basic 90×190×43 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7318-BEGAPH",
      "7318 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7318-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7318 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 166,
    "static_load_kN": 146,
    "fatigue_load_limit_kN": 5.3,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 5200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7318 BECBM is SKF's 90 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 90×190×43 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 90×190×43 mm (3.543×7.48×1.693 in), 50.0 mm radial section height, C 166 kN, C0 146 kN, Pu 5.3 kN.reference speed 4,300 r/min (thermal) and limiting speed 5,600 r/min (mechanical), catalogue mass 5200 g. Selection figures for 7318 BECBM: the static-to-dynamic ratio C0/C is 0.88, Pu 5.3 kN is about 3 % of C, and catalogue mass works out to roughly 58 g per millimetre of bore. At the printed limiting speed of 5,600 r/min the mean pitch diameter dm ≈ 140.0 mm implies a dn value around 784k mm·r/min; the 4,300 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 190 over bore 90 is a 2.11× step for this size, and the 43 mm width gives a bore/width ratio of 2.09; use these ratios when housing space around the 90 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7318-BECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Assign interference to the rotating ring — roughly k5 on a 90 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7318-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7318-BECBM?",
        "a": "7318 BECBM measures 90 mm bore × 190 mm OD × 43 mm width (3.543 × 7.48 × 1.693 in), mass about 5200 g. SKF 17000 ratings: C 166 kN, C0 146 kN, Pu 5.3 kN, reference speed 4,300 r/min (thermal) and limiting speed 5,600 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7318-BECBM?",
        "a": "The 4,300 r/min reference (thermal) and 5,600 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7318-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7318-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7318-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope with catalogue ratings within 10 %; 7318 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-318-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope, but catalogue C/C0 differ between executions (166/146 kN vs 285/305 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-318-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope, but catalogue C/C0 differ between executions (166/146 kN vs 285/305 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7318 BEP is the basic 90×190×43 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7318-BECBM",
      "7318 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7219-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7219 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 124,
    "static_load_kN": 108,
    "fatigue_load_limit_kN": 4,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 2700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7219 BEP is SKF's 95 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 95×170×32 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 95×170×32 mm (3.74×6.693×1.26 in), 37.5 mm radial section height, C 124 kN, C0 108 kN, Pu 4 kN.reference speed 4,500 r/min (thermal) and limiting speed 4,300 r/min (mechanical), catalogue mass 2700 g. Load balance: C0 108 kN against C 124 kN gives a 0.87 ratio, typical of a steep-angle axial-oriented design; Pu 4 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 2700 g inside the 95×170×32 mm outline leaves a 37.5 mm radial section, and the 108 kN static rating is 0.87× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 170 over bore 95 is a 1.79× step for this size, and the 32 mm width gives a bore/width ratio of 2.97; use these ratios when housing space around the 95 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Assign interference to the rotating ring — roughly k5 on a 95 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7219-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7219 BEP as the single basic pa66 execution; the other order numbers of the 7219 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7219-BEP?",
        "a": "7219 BEP measures 95 mm bore × 170 mm OD × 32 mm width (3.74 × 6.693 × 1.26 in), mass about 2700 g. SKF 17000 ratings: C 124 kN, C0 108 kN, Pu 4 kN, reference speed 4,500 r/min (thermal) and limiting speed 4,300 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7219-BEP?",
        "a": "With a rotating inner ring use roughly k5 on the 95 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7219-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7219-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-219-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope, but catalogue C/C0 differ between executions (124/108 kN vs 212/232 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7219",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7219 BEP is the basic 95×170×32 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7219-BEP",
      "7219 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7219-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7219 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 129,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 4.4,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 2700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7219 BECBP is SKF's 95 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 95×170×32 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 95×170×32 mm (3.74×6.693×1.26 in), 37.5 mm radial section height, C 129 kN, C0 118 kN, Pu 4.4 kN.reference speed 4,500 r/min (thermal) and limiting speed 4,800 r/min (mechanical), catalogue mass 2700 g. The 4.4 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 129/118 kN ratings and 2700 g mass this execution carries about 1.36 kN of C per millimetre of bore. Load balance: C0 118 kN against C 129 kN gives a 0.91 ratio, typical of a steep-angle axial-oriented design; Pu 4.4 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 170 over bore 95 is a 1.79× step for this size, and the 32 mm width gives a bore/width ratio of 2.97; use these ratios when housing space around the 95 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7219-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "At 95 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "One 7219-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Fillet radii must clear the chamfer so the 32 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7219-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7219-BECBP?",
        "a": "7219 BECBP measures 95 mm bore × 170 mm OD × 32 mm width (3.74 × 6.693 × 1.26 in), mass about 2700 g. SKF 17000 ratings: C 129 kN, C0 118 kN, Pu 4.4 kN, reference speed 4,500 r/min (thermal) and limiting speed 4,800 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7219-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 4,800 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7219-BECBP?",
        "a": "The 4,500 r/min reference (thermal) and 4,800 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7219-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7219-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-219-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope, but catalogue C/C0 differ between executions (129/118 kN vs 212/232 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7219",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7219 BEP is the basic 95×170×32 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7219-BECBP",
      "7219 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7219-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7219 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 129,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 4.4,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 2700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7219 BECBY is SKF's 95 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 95×170×32 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 95×170×32 mm (3.74×6.693×1.26 in), 37.5 mm radial section height, C 129 kN, C0 118 kN, Pu 4.4 kN.reference speed 4,500 r/min (thermal) and limiting speed 4,800 r/min (mechanical), catalogue mass 2700 g. Mass and section check: 2700 g inside the 95×170×32 mm outline leaves a 37.5 mm radial section, and the 118 kN static rating is 0.91× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 118 kN against C 129 kN gives a 0.91 ratio, typical of a steep-angle axial-oriented design; Pu 4.4 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 170 over bore 95 is a 1.79× step for this size, and the 32 mm width gives a bore/width ratio of 2.97; use these ratios when housing space around the 95 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Assign interference to the rotating ring — roughly k5 on a 95 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7219-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7219-BECBY?",
        "a": "7219 BECBY measures 95 mm bore × 170 mm OD × 32 mm width (3.74 × 6.693 × 1.26 in), mass about 2700 g. SKF 17000 ratings: C 129 kN, C0 118 kN, Pu 4.4 kN, reference speed 4,500 r/min (thermal) and limiting speed 4,800 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which grease and fill for 7219-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 4,800 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7219-BECBY?",
        "a": "The 4,500 r/min reference (thermal) and 4,800 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7219-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7219-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-219-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope, but catalogue C/C0 differ between executions (129/118 kN vs 212/232 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7219",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7219 BEP is the basic 95×170×32 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7219-BECBY",
      "7219 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7219-BEGAPH",
    "brand": "SKF",
    "manufacturer_designation": "7219 BEGAPH",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 129,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 4.4,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 2700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7219 BEGAPH is SKF's 95 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 95×170×32 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage. Envelope 95×170×32 mm (3.74×6.693×1.26 in), 37.5 mm radial section height, C 129 kN, C0 118 kN, Pu 4.4 kN.reference speed 4,500 r/min (thermal) and limiting speed 4,800 r/min (mechanical), catalogue mass 2700 g. Load balance: C0 118 kN against C 129 kN gives a 0.91 ratio, typical of a steep-angle axial-oriented design; Pu 4.4 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,800 r/min while thermal balance under catalogue load sets the 4,500 r/min reference; at dm ≈ 132.5 mm the corresponding dn is approximately 636k mm·r/min. Bore-to-OD planning: OD 170 over bore 95 is a 1.79× step for this size, and the 32 mm width gives a bore/width ratio of 2.97; use these ratios when housing space around the 95 mm shaft is the first constraint. Preload and cage note: BEGAPH arrives as a universally matchable unit with GA light preload already defined for back-to-back or face-to-face sets, combined with the glass-fibre PEEK ball-centred cage for high-speed duty; it replaces field preload adjustment, not the need for correct stand-off geometry.",
    "applications": [
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives",
      "printing and paper-machine rolls"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PEEK cage wear plus preload drift when contaminated lubricant reaches the ball-centred pockets of a GA set",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "At 95 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7219-BEGAPH favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BEGAPH bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7219-BEGAPH?",
        "a": "7219 BEGAPH measures 95 mm bore × 170 mm OD × 32 mm width (3.74 × 6.693 × 1.26 in), mass about 2700 g. SKF 17000 ratings: C 129 kN, C0 118 kN, Pu 4.4 kN, reference speed 4,500 r/min (thermal) and limiting speed 4,800 r/min (mechanical)."
      },
      {
        "q": "What does the BEGAPH suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PEEK cage, ball-centred (suffix PH), keeping the polymer-cage speed advantage well above the PA66 temperature range. GA marks universal matching with light factory preload for back-to-back or face-to-face sets — stiffer than CB clearance while generating less heat than GB/GC. BEGAPH combines light-preload (GA) universal matching with a PEEK ball-centred cage."
      },
      {
        "q": "Which grease and fill for 7219-BEGAPH?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 4,800 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7219-BEGAPH?",
        "a": "The 4,500 r/min reference (thermal) and 4,800 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7219-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7219-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-219-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope, but catalogue C/C0 differ between executions (129/118 kN vs 212/232 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7219",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7219 BEP is the basic 95×170×32 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7219-BEGAPH",
      "7219 BEGAPH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7219-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7219 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 129,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 4.4,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 2700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7219 BECBM is SKF's 95 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 95×170×32 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 95×170×32 mm (3.74×6.693×1.26 in), 37.5 mm radial section height, C 129 kN, C0 118 kN, Pu 4.4 kN.reference speed 4,500 r/min (thermal) and limiting speed 6,000 r/min (mechanical), catalogue mass 2700 g. Envelope economics: the 32 mm width over a 37.5 mm section yields 0.85 mm of ring width per section millimetre, and the bearing weighs 2700 g for 129 kN of dynamic capacity — about 21 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 6,000 r/min while thermal balance under catalogue load sets the 4,500 r/min reference; at dm ≈ 132.5 mm the corresponding dn is approximately 795k mm·r/min. Bore-to-OD planning: OD 170 over bore 95 is a 1.79× step for this size, and the 32 mm width gives a bore/width ratio of 2.97; use these ratios when housing space around the 95 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7219-BECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Assign interference to the rotating ring — roughly k5 on a 95 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7219-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7219-BECBM?",
        "a": "7219 BECBM measures 95 mm bore × 170 mm OD × 32 mm width (3.74 × 6.693 × 1.26 in), mass about 2700 g. SKF 17000 ratings: C 129 kN, C0 118 kN, Pu 4.4 kN, reference speed 4,500 r/min (thermal) and limiting speed 6,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7219-BECBM?",
        "a": "With a rotating inner ring use roughly k5 on the 95 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7219-BECBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 6,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7219-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7219-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7219-BEGAPH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope with catalogue ratings within 10 %; 7219 BEGAPH is the PEEK cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-219-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope, but catalogue C/C0 differ between executions (129/118 kN vs 212/232 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7219",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7219 BEP is the basic 95×170×32 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7219-BECBM",
      "7219 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7319-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7319 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 168,
    "static_load_kN": 150,
    "fatigue_load_limit_kN": 5.2,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 6050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7319 BEP is SKF's 95 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 95×200×45 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 95×200×45 mm (3.74×7.874×1.772 in), 52.5 mm radial section height, C 168 kN, C0 150 kN, Pu 5.2 kN.reference speed 4,000 r/min (thermal) and limiting speed 3,800 r/min (mechanical), catalogue mass 6050 g. Envelope economics: the 45 mm width over a 52.5 mm section yields 0.86 mm of ring width per section millimetre, and the bearing weighs 6050 g for 168 kN of dynamic capacity — about 36 g per rated kN. Mass and section check: 6050 g inside the 95×200×45 mm outline leaves a 52.5 mm radial section, and the 150 kN static rating is 0.89× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 200 over bore 95 is a 2.11× step for this size, and the 45 mm width gives a bore/width ratio of 2.11; use these ratios when housing space around the 95 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives",
      "printing and paper-machine rolls"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7319-BEP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Assign interference to the rotating ring — roughly k5 on a 95 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the chamfer so the 45 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "One 7319-BEP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7319-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7319 BEP as the single basic pa66 execution; the other order numbers of the 7319 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7319-BEP?",
        "a": "7319 BEP measures 95 mm bore × 200 mm OD × 45 mm width (3.74 × 7.874 × 1.772 in), mass about 6050 g. SKF 17000 ratings: C 168 kN, C0 150 kN, Pu 5.2 kN, reference speed 4,000 r/min (thermal) and limiting speed 3,800 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What minimum axial load does 7319-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7319-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-319-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope, but catalogue C/C0 differ between executions (168/150 kN vs 305/340 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-319-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope, but catalogue C/C0 differ between executions (168/150 kN vs 305/340 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7319",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7319 BEP is the basic 95×200×45 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7319-BEP",
      "7319 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7319-BEM",
    "brand": "SKF",
    "manufacturer_designation": "7319 BEM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 168,
    "static_load_kN": 150,
    "fatigue_load_limit_kN": 5.2,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 6050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7319 BEM is SKF's 95 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 95×200×45 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.. Envelope 95×200×45 mm (3.74×7.874×1.772 in), 52.5 mm radial section height, C 168 kN, C0 150 kN, Pu 5.2 kN.reference speed 4,000 r/min (thermal) and limiting speed 4,000 r/min (mechanical), which coincide for this size, catalogue mass 6050 g. Load balance: C0 150 kN against C 168 kN gives a 0.89 ratio, typical of a steep-angle axial-oriented design; Pu 5.2 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 6050 g inside the 95×200×45 mm outline leaves a 52.5 mm radial section, and the 150 kN static rating is 0.89× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 200 over bore 95 is a 2.11× step for this size, and the 45 mm width gives a bore/width ratio of 2.11; use these ratios when housing space around the 95 mm shaft is the first constraint. Ordering note: BEM pairs the optimized 40-degree geometry with a machined one-piece brass window cage as a basic (non-universal) single bearing; it is the brass-cage counterpart of the polymer BEP, and universally matchable positions must use the BECBM or BCBM execution instead.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "One 7319-BEM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Fillet radii must clear the chamfer so the 45 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7319-BEM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7319 BEM as the single basic machined brass execution; the other order numbers of the 7319 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7319-BEM?",
        "a": "7319 BEM measures 95 mm bore × 200 mm OD × 45 mm width (3.74 × 7.874 × 1.772 in), mass about 6050 g. SKF 17000 ratings: C 168 kN, C0 150 kN, Pu 5.2 kN, reference speed 4,000 r/min (thermal) and limiting speed 4,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.."
      },
      {
        "q": "Can one 7319-BEM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7319-BEM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7319-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-319-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope, but catalogue C/C0 differ between executions (168/150 kN vs 305/340 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-319-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope, but catalogue C/C0 differ between executions (168/150 kN vs 305/340 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7319",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7319 BEP is the basic 95×200×45 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7319-BEM",
      "7319 BEM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7319-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7319 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 180,
    "static_load_kN": 163,
    "fatigue_load_limit_kN": 5.7,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 6050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7319 BECBP is SKF's 95 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 95×200×45 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 95×200×45 mm (3.74×7.874×1.772 in), 52.5 mm radial section height, C 180 kN, C0 163 kN, Pu 5.7 kN.reference speed 4,000 r/min (thermal) and limiting speed 4,300 r/min (mechanical), catalogue mass 6050 g. Selection figures for 7319 BECBP: the static-to-dynamic ratio C0/C is 0.91, Pu 5.7 kN is about 3 % of C, and catalogue mass works out to roughly 64 g per millimetre of bore. At the printed limiting speed of 4,300 r/min the mean pitch diameter dm ≈ 147.5 mm implies a dn value around 634k mm·r/min; the 4,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 200 over bore 95 is a 2.11× step for this size, and the 45 mm width gives a bore/width ratio of 2.11; use these ratios when housing space around the 95 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7319-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7319-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7319-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7319-BECBP?",
        "a": "7319 BECBP measures 95 mm bore × 200 mm OD × 45 mm width (3.74 × 7.874 × 1.772 in), mass about 6050 g. SKF 17000 ratings: C 180 kN, C0 163 kN, Pu 5.7 kN, reference speed 4,000 r/min (thermal) and limiting speed 4,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7319-BECBP?",
        "a": "The 4,000 r/min reference (thermal) and 4,300 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7319-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7319-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-319-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope, but catalogue C/C0 differ between executions (180/163 kN vs 305/340 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-319-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope, but catalogue C/C0 differ between executions (180/163 kN vs 305/340 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7319",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7319 BEP is the basic 95×200×45 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7319-BECBP",
      "7319 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7319-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7319 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 180,
    "static_load_kN": 163,
    "fatigue_load_limit_kN": 5.7,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 6050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7319 BECBY is SKF's 95 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 95×200×45 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 95×200×45 mm (3.74×7.874×1.772 in), 52.5 mm radial section height, C 180 kN, C0 163 kN, Pu 5.7 kN.reference speed 4,000 r/min (thermal) and limiting speed 4,300 r/min (mechanical), catalogue mass 6050 g. Selection figures for 7319 BECBY: the static-to-dynamic ratio C0/C is 0.91, Pu 5.7 kN is about 3 % of C, and catalogue mass works out to roughly 64 g per millimetre of bore. Load balance: C0 163 kN against C 180 kN gives a 0.91 ratio, typical of a steep-angle axial-oriented design; Pu 5.7 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 200 over bore 95 is a 2.11× step for this size, and the 45 mm width gives a bore/width ratio of 2.11; use these ratios when housing space around the 95 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives",
      "heavy feed and take-up rolls"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "At 95 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Fillet radii must clear the chamfer so the 45 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7319-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7319-BECBY?",
        "a": "7319 BECBY measures 95 mm bore × 200 mm OD × 45 mm width (3.74 × 7.874 × 1.772 in), mass about 6050 g. SKF 17000 ratings: C 180 kN, C0 163 kN, Pu 5.7 kN, reference speed 4,000 r/min (thermal) and limiting speed 4,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Which fits should I use for 7319-BECBY?",
        "a": "With a rotating inner ring use roughly k5 on the 95 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7319-BECBY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 4,300 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7319-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-319-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope, but catalogue C/C0 differ between executions (180/163 kN vs 305/340 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-319-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope, but catalogue C/C0 differ between executions (180/163 kN vs 305/340 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7319",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7319 BEP is the basic 95×200×45 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7319-BECBY",
      "7319 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7319-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7319 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 180,
    "static_load_kN": 163,
    "fatigue_load_limit_kN": 5.7,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 6050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7319 BECBM is SKF's 95 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 95×200×45 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 95×200×45 mm (3.74×7.874×1.772 in), 52.5 mm radial section height, C 180 kN, C0 163 kN, Pu 5.7 kN.reference speed 4,000 r/min (thermal) and limiting speed 5,300 r/min (mechanical), catalogue mass 6050 g. Sizing arithmetic on the 95 mm bore: 180 kN C divided by the 52.5 mm radial section height gives 3.4 kN per section millimetre; the 6050 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 6050 g inside the 95×200×45 mm outline leaves a 52.5 mm radial section, and the 163 kN static rating is 0.91× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 200 over bore 95 is a 2.11× step for this size, and the 45 mm width gives a bore/width ratio of 2.11; use these ratios when housing space around the 95 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Fillet radii must clear the chamfer so the 45 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Assign interference to the rotating ring — roughly k5 on a 95 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7319-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7319-BECBM?",
        "a": "7319 BECBM measures 95 mm bore × 200 mm OD × 45 mm width (3.74 × 7.874 × 1.772 in), mass about 6050 g. SKF 17000 ratings: C 180 kN, C0 163 kN, Pu 5.7 kN, reference speed 4,000 r/min (thermal) and limiting speed 5,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7319-BECBM?",
        "a": "With a rotating inner ring use roughly k5 on the 95 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7319-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7319-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope with catalogue ratings within 10 %; 7319 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-319-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope, but catalogue C/C0 differ between executions (180/163 kN vs 305/340 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-319-N2PHAS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope, but catalogue C/C0 differ between executions (180/163 kN vs 305/340 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7319",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7319 BEP is the basic 95×200×45 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7319-BECBM",
      "7319 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7220-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7220 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 135,
    "static_load_kN": 122,
    "fatigue_load_limit_kN": 4.4,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 3300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7220 BEP is SKF's 100 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 100×180×34 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 100×180×34 mm (3.937×7.087×1.339 in), 40.0 mm radial section height, C 135 kN, C0 122 kN, Pu 4.4 kN.reference speed 4,300 r/min (thermal) and limiting speed 4,000 r/min (mechanical), catalogue mass 3300 g. Load balance: C0 122 kN against C 135 kN gives a 0.90 ratio, typical of a steep-angle axial-oriented design; Pu 4.4 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,000 r/min while thermal balance under catalogue load sets the 4,300 r/min reference; at dm ≈ 140.0 mm the corresponding dn is approximately 560k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 4,300 r/min against a 4,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.07. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly k5 on a 100 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "At 100 mm bore the k5 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Fillet radii must clear the chamfer so the 34 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7220-BEP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7220-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7220 BEP as the single basic pa66 execution; the other order numbers of the 7220 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7220-BEP?",
        "a": "7220 BEP measures 100 mm bore × 180 mm OD × 34 mm width (3.937 × 7.087 × 1.339 in), mass about 3300 g. SKF 17000 ratings: C 135 kN, C0 122 kN, Pu 4.4 kN, reference speed 4,300 r/min (thermal) and limiting speed 4,000 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which grease and fill for 7220-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 4,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7220-BEP?",
        "a": "The 4,300 r/min reference (thermal) and 4,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7220-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7220-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope with catalogue ratings within 10 %; 7220 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7220-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope with catalogue ratings within 10 %; 7220 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7220-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope with catalogue ratings within 10 %; 7220 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-220-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope, but catalogue C/C0 differ between executions (135/122 kN vs 236/265 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7220",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7220 BEP is the basic 100×180×34 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7220-BEP",
      "7220 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7220-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7220 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 143,
    "static_load_kN": 134,
    "fatigue_load_limit_kN": 4.75,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 3300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7220 BECBP is SKF's 100 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 100×180×34 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 100×180×34 mm (3.937×7.087×1.339 in), 40.0 mm radial section height, C 143 kN, C0 134 kN, Pu 4.75 kN.reference speed 4,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 3300 g. The 4.75 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 143/134 kN ratings and 3300 g mass this execution carries about 1.43 kN of C per millimetre of bore. Mass and section check: 3300 g inside the 100×180×34 mm outline leaves a 40.0 mm radial section, and the 134 kN static rating is 0.94× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 4,300 r/min against a 4,500 r/min limiting speed, i.e. a reference-to-limit ratio of 0.96. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives",
      "printing and paper-machine rolls"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "One 7220-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Fillet radii must clear the chamfer so the 34 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7220-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7220-BECBP?",
        "a": "7220 BECBP measures 100 mm bore × 180 mm OD × 34 mm width (3.937 × 7.087 × 1.339 in), mass about 3300 g. SKF 17000 ratings: C 143 kN, C0 134 kN, Pu 4.75 kN, reference speed 4,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7220-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 4,500 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7220-BECBP?",
        "a": "The 4,300 r/min reference (thermal) and 4,500 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7220-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7220-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope with catalogue ratings within 10 %; 7220 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7220-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope with catalogue ratings within 10 %; 7220 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7220-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope with catalogue ratings within 10 %; 7220 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-220-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope, but catalogue C/C0 differ between executions (143/134 kN vs 236/265 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7220",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7220 BEP is the basic 100×180×34 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7220-BECBP",
      "7220 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7220-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7220 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 143,
    "static_load_kN": 134,
    "fatigue_load_limit_kN": 4.75,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 3300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7220 BECBY is SKF's 100 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 100×180×34 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 100×180×34 mm (3.937×7.087×1.339 in), 40.0 mm radial section height, C 143 kN, C0 134 kN, Pu 4.75 kN.reference speed 4,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 3300 g. Mass and section check: 3300 g inside the 100×180×34 mm outline leaves a 40.0 mm radial section, and the 134 kN static rating is 0.94× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 4,500 r/min the mean pitch diameter dm ≈ 140.0 mm implies a dn value around 630k mm·r/min; the 4,300 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 4,300 r/min against a 4,500 r/min limiting speed, i.e. a reference-to-limit ratio of 0.96. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7220-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7220-BECBY?",
        "a": "7220 BECBY measures 100 mm bore × 180 mm OD × 34 mm width (3.937 × 7.087 × 1.339 in), mass about 3300 g. SKF 17000 ratings: C 143 kN, C0 134 kN, Pu 4.75 kN, reference speed 4,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7220-BECBY?",
        "a": "With a rotating inner ring use roughly k5 on the 100 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7220-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7220-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope with catalogue ratings within 10 %; 7220 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7220-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope with catalogue ratings within 10 %; 7220 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7220-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope with catalogue ratings within 10 %; 7220 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-220-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope, but catalogue C/C0 differ between executions (143/134 kN vs 236/265 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7220",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7220 BEP is the basic 100×180×34 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7220-BECBY",
      "7220 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7220-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7220 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 143,
    "static_load_kN": 134,
    "fatigue_load_limit_kN": 4.75,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 3300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7220 BECBM is SKF's 100 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 100×180×34 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 100×180×34 mm (3.937×7.087×1.339 in), 40.0 mm radial section height, C 143 kN, C0 134 kN, Pu 4.75 kN.reference speed 4,300 r/min (thermal) and limiting speed 5,600 r/min (mechanical), catalogue mass 3300 g. Envelope economics: the 34 mm width over a 40.0 mm section yields 0.85 mm of ring width per section millimetre, and the bearing weighs 3300 g for 143 kN of dynamic capacity — about 23 g per rated kN. At the printed limiting speed of 5,600 r/min the mean pitch diameter dm ≈ 140.0 mm implies a dn value around 784k mm·r/min; the 4,300 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 4,300 r/min against a 5,600 r/min limiting speed, i.e. a reference-to-limit ratio of 0.77. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives",
      "heavy feed and take-up rolls"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "One 7220-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "One 7220-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7220-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7220-BECBM?",
        "a": "7220 BECBM measures 100 mm bore × 180 mm OD × 34 mm width (3.937 × 7.087 × 1.339 in), mass about 3300 g. SKF 17000 ratings: C 143 kN, C0 134 kN, Pu 4.75 kN, reference speed 4,300 r/min (thermal) and limiting speed 5,600 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7220-BECBM?",
        "a": "With a rotating inner ring use roughly k5 on the 100 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7220-BECBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 5,600 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7220-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7220-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope with catalogue ratings within 10 %; 7220 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7220-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope with catalogue ratings within 10 %; 7220 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7220-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope with catalogue ratings within 10 %; 7220 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-220-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope, but catalogue C/C0 differ between executions (143/134 kN vs 236/265 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7220",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7220 BEP is the basic 100×180×34 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7220-BECBM",
      "7220 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7320-BEM",
    "brand": "SKF",
    "manufacturer_designation": "7320 BEM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 203,
    "static_load_kN": 190,
    "fatigue_load_limit_kN": 6.4,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 7500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7320 BEM is SKF's 100 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 100×215×47 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.. Envelope 100×215×47 mm (3.937×8.465×1.85 in), 57.5 mm radial section height, C 203 kN, C0 190 kN, Pu 6.4 kN.reference speed 3,800 r/min (thermal) and limiting speed 3,600 r/min (mechanical), catalogue mass 7500 g. Load balance: C0 190 kN against C 203 kN gives a 0.94 ratio, typical of a steep-angle axial-oriented design; Pu 6.4 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 3,600 r/min while thermal balance under catalogue load sets the 3,800 r/min reference; at dm ≈ 157.5 mm the corresponding dn is approximately 567k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 3,800 r/min against a 3,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.06. Ordering note: BEM pairs the optimized 40-degree geometry with a machined one-piece brass window cage as a basic (non-universal) single bearing; it is the brass-cage counterpart of the polymer BEP, and universally matchable positions must use the BECBM or BCBM execution instead.",
    "applications": [
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives",
      "heavy feed and take-up rolls"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BEM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Fillet radii must clear the chamfer so the 47 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Do not mix execution classes inside one set: a universally matchable BEM unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7320-BEM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7320 BEM as the single basic machined brass execution; the other order numbers of the 7320 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7320-BEM?",
        "a": "7320 BEM measures 100 mm bore × 215 mm OD × 47 mm width (3.937 × 8.465 × 1.85 in), mass about 7500 g. SKF 17000 ratings: C 203 kN, C0 190 kN, Pu 6.4 kN, reference speed 3,800 r/min (thermal) and limiting speed 3,600 r/min (mechanical)."
      },
      {
        "q": "What does the BEM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.."
      },
      {
        "q": "Which grease and fill for 7320-BEM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 3,600 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7320-BEM?",
        "a": "The 3,800 r/min reference (thermal) and 3,600 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7320-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7320-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-320-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope, but catalogue C/C0 differ between executions (203/190 kN vs 345/400 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7320 BEP is the basic 100×215×47 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7320-BEM",
      "7320 BEM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7320-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7320 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 203,
    "static_load_kN": 190,
    "fatigue_load_limit_kN": 6.4,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 7500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7320 BEP is SKF's 100 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 100×215×47 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 100×215×47 mm (3.937×8.465×1.85 in), 57.5 mm radial section height, C 203 kN, C0 190 kN, Pu 6.4 kN.reference speed 3,800 r/min (thermal) and limiting speed 3,600 r/min (mechanical), catalogue mass 7500 g. Envelope economics: the 47 mm width over a 57.5 mm section yields 0.82 mm of ring width per section millimetre, and the bearing weighs 7500 g for 203 kN of dynamic capacity — about 37 g per rated kN. Selection figures for 7320 BEP: the static-to-dynamic ratio C0/C is 0.94, Pu 6.4 kN is about 3 % of C, and catalogue mass works out to roughly 75 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 3,800 r/min against a 3,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.06. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives",
      "printing and paper-machine rolls"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7320-BEP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7320-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7320 BEP as the single basic pa66 execution; the other order numbers of the 7320 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7320-BEP?",
        "a": "7320 BEP measures 100 mm bore × 215 mm OD × 47 mm width (3.937 × 8.465 × 1.85 in), mass about 7500 g. SKF 17000 ratings: C 203 kN, C0 190 kN, Pu 6.4 kN, reference speed 3,800 r/min (thermal) and limiting speed 3,600 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What minimum axial load does 7320-BEP need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7320-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7320-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-320-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope, but catalogue C/C0 differ between executions (203/190 kN vs 345/400 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7320 BEP is the basic 100×215×47 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7320-BEP",
      "7320 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7320-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7320 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 216,
    "static_load_kN": 208,
    "fatigue_load_limit_kN": 6.95,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 7500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7320 BECBP is SKF's 100 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 100×215×47 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 100×215×47 mm (3.937×8.465×1.85 in), 57.5 mm radial section height, C 216 kN, C0 208 kN, Pu 6.95 kN.reference speed 3,800 r/min (thermal) and limiting speed 4,000 r/min (mechanical), catalogue mass 7500 g. Selection figures for 7320 BECBP: the static-to-dynamic ratio C0/C is 0.96, Pu 6.95 kN is about 3 % of C, and catalogue mass works out to roughly 75 g per millimetre of bore. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,000 r/min while thermal balance under catalogue load sets the 3,800 r/min reference; at dm ≈ 157.5 mm the corresponding dn is approximately 630k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 3,800 r/min against a 4,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.95. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Fillet radii must clear the chamfer so the 47 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7320-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7320-BECBP?",
        "a": "7320 BECBP measures 100 mm bore × 215 mm OD × 47 mm width (3.937 × 8.465 × 1.85 in), mass about 7500 g. SKF 17000 ratings: C 216 kN, C0 208 kN, Pu 6.95 kN, reference speed 3,800 r/min (thermal) and limiting speed 4,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7320-BECBP?",
        "a": "The 3,800 r/min reference (thermal) and 4,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7320-BECBP take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7320-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7320-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-320-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope, but catalogue C/C0 differ between executions (216/208 kN vs 345/400 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7320 BEP is the basic 100×215×47 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7320-BECBP",
      "7320 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7320-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7320 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 216,
    "static_load_kN": 208,
    "fatigue_load_limit_kN": 6.95,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 7500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7320 BECBY is SKF's 100 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 100×215×47 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 100×215×47 mm (3.937×8.465×1.85 in), 57.5 mm radial section height, C 216 kN, C0 208 kN, Pu 6.95 kN.reference speed 3,800 r/min (thermal) and limiting speed 4,000 r/min (mechanical), catalogue mass 7500 g. Selection figures for 7320 BECBY: the static-to-dynamic ratio C0/C is 0.96, Pu 6.95 kN is about 3 % of C, and catalogue mass works out to roughly 75 g per millimetre of bore. Envelope economics: the 47 mm width over a 57.5 mm section yields 0.82 mm of ring width per section millimetre, and the bearing weighs 7500 g for 216 kN of dynamic capacity — about 35 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 3,800 r/min against a 4,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.95. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Assign interference to the rotating ring — roughly k5 on a 100 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "One 7320-BECBY locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7320-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7320-BECBY?",
        "a": "7320 BECBY measures 100 mm bore × 215 mm OD × 47 mm width (3.937 × 8.465 × 1.85 in), mass about 7500 g. SKF 17000 ratings: C 216 kN, C0 208 kN, Pu 6.95 kN, reference speed 3,800 r/min (thermal) and limiting speed 4,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What minimum axial load does 7320-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7320-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7320-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-320-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope, but catalogue C/C0 differ between executions (216/208 kN vs 345/400 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7320 BEP is the basic 100×215×47 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7320-BECBY",
      "7320 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7320-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7320 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 216,
    "static_load_kN": 208,
    "fatigue_load_limit_kN": 6.95,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 7500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7320 BECBM is SKF's 100 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 100×215×47 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 100×215×47 mm (3.937×8.465×1.85 in), 57.5 mm radial section height, C 216 kN, C0 208 kN, Pu 6.95 kN.reference speed 3,800 r/min (thermal) and limiting speed 5,000 r/min (mechanical), catalogue mass 7500 g. Sizing arithmetic on the 100 mm bore: 216 kN C divided by the 57.5 mm radial section height gives 3.8 kN per section millimetre; the 7500 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 208 kN against C 216 kN gives a 0.96 ratio, typical of a steep-angle axial-oriented design; Pu 6.95 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 3,800 r/min against a 5,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.76. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7320-BECBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7320-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7320-BECBM?",
        "a": "7320 BECBM measures 100 mm bore × 215 mm OD × 47 mm width (3.937 × 8.465 × 1.85 in), mass about 7500 g. SKF 17000 ratings: C 216 kN, C0 208 kN, Pu 6.95 kN, reference speed 3,800 r/min (thermal) and limiting speed 5,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7320-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7320-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7320-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7320-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7320-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope with catalogue ratings within 10 %; 7320 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-320-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope, but catalogue C/C0 differ between executions (216/208 kN vs 345/400 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7320 BEP is the basic 100×215×47 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7320-BECBM",
      "7320 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7221-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7221 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 105,
    "D_mm": 190,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 156,
    "static_load_kN": 150,
    "fatigue_load_limit_kN": 5.2,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 3950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7221 BECBP is SKF's 105 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 105×190×36 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 105×190×36 mm (4.134×7.48×1.417 in), 42.5 mm radial section height, C 156 kN, C0 150 kN, Pu 5.2 kN.reference speed 4,000 r/min (thermal) and limiting speed 4,300 r/min (mechanical), catalogue mass 3950 g. Envelope economics: the 36 mm width over a 42.5 mm section yields 0.85 mm of ring width per section millimetre, and the bearing weighs 3950 g for 156 kN of dynamic capacity — about 25 g per rated kN. At the printed limiting speed of 4,300 r/min the mean pitch diameter dm ≈ 147.5 mm implies a dn value around 634k mm·r/min; the 4,000 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 4,000 r/min against a 4,300 r/min limiting speed, i.e. a reference-to-limit ratio of 0.93. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "At 105 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Mount by induction-heating the inner ring to max 120 °C — the PA66 cage sets the ceiling, not the steel; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7221-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7221-BECBP?",
        "a": "7221 BECBP measures 105 mm bore × 190 mm OD × 36 mm width (4.134 × 7.48 × 1.417 in), mass about 3950 g. SKF 17000 ratings: C 156 kN, C0 150 kN, Pu 5.2 kN, reference speed 4,000 r/min (thermal) and limiting speed 4,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7221-BECBP?",
        "a": "With a rotating inner ring use roughly m6 on the 105 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7221-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 4,300 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7221-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7221-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×190×36 mm envelope with catalogue ratings within 10 %; 7221 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7221",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7221 BECBP is the basic 105×190×36 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7221-BECBP",
      "7221 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7221-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7221 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 105,
    "D_mm": 190,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 156,
    "static_load_kN": 150,
    "fatigue_load_limit_kN": 5.2,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 3950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7221 BECBM is SKF's 105 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 105×190×36 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 105×190×36 mm (4.134×7.48×1.417 in), 42.5 mm radial section height, C 156 kN, C0 150 kN, Pu 5.2 kN.reference speed 4,000 r/min (thermal) and limiting speed 5,300 r/min (mechanical), catalogue mass 3950 g. The 5.2 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 156/150 kN ratings and 3950 g mass this execution carries about 1.49 kN of C per millimetre of bore. Mass and section check: 3950 g inside the 105×190×36 mm outline leaves a 42.5 mm radial section, and the 150 kN static rating is 0.96× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 4,000 r/min against a 5,300 r/min limiting speed, i.e. a reference-to-limit ratio of 0.75. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Assign interference to the rotating ring — roughly m6 on a 105 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7221-BECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7221-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7221-BECBM?",
        "a": "7221 BECBM measures 105 mm bore × 190 mm OD × 36 mm width (4.134 × 7.48 × 1.417 in), mass about 3950 g. SKF 17000 ratings: C 156 kN, C0 150 kN, Pu 5.2 kN, reference speed 4,000 r/min (thermal) and limiting speed 5,300 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7221-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7221-BECBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7221-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7221-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×190×36 mm envelope with catalogue ratings within 10 %; 7221 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7221",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7221 BECBP is the basic 105×190×36 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7221-BECBM",
      "7221 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7321-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7321 BEP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 105,
    "D_mm": 225,
    "B_mm": 49,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 203,
    "static_load_kN": 193,
    "fatigue_load_limit_kN": 6.4,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 8550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7321 BEP is SKF's 105 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 105×225×49 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 105×225×49 mm (4.134×8.858×1.929 in), 60.0 mm radial section height, C 203 kN, C0 193 kN, Pu 6.4 kN.reference speed 3,600 r/min (thermal) and limiting speed 3,400 r/min (mechanical), catalogue mass 8550 g. Mass and section check: 8550 g inside the 105×225×49 mm outline leaves a 60.0 mm radial section, and the 193 kN static rating is 0.95× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 3,400 r/min the mean pitch diameter dm ≈ 165.0 mm implies a dn value around 561k mm·r/min; the 3,600 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 3,600 r/min against a 3,400 r/min limiting speed, i.e. a reference-to-limit ratio of 1.06. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7321-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7321 BEP as the single basic pa66 execution; the other order numbers of the 7321 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7321-BEP?",
        "a": "7321 BEP measures 105 mm bore × 225 mm OD × 49 mm width (4.134 × 8.858 × 1.929 in), mass about 8550 g. SKF 17000 ratings: C 203 kN, C0 193 kN, Pu 6.4 kN, reference speed 3,600 r/min (thermal) and limiting speed 3,400 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "Which grease and fill for 7321-BEP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 3,400 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7321-BEP?",
        "a": "The 3,600 r/min reference (thermal) and 3,400 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7321-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7321-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×225×49 mm envelope with catalogue ratings within 10 %; 7321 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7321-DECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×225×49 mm envelope with catalogue ratings within 10 %; 7321 DECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7321",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7321 BEP is the basic 105×225×49 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7321-BEP",
      "7321 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7321-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7321 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 105,
    "D_mm": 225,
    "B_mm": 49,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 216,
    "static_load_kN": 208,
    "fatigue_load_limit_kN": 6.95,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 8550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7321 BECBP is SKF's 105 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 105×225×49 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 105×225×49 mm (4.134×8.858×1.929 in), 60.0 mm radial section height, C 216 kN, C0 208 kN, Pu 6.95 kN.reference speed 3,600 r/min (thermal) and limiting speed 3,800 r/min (mechanical), catalogue mass 8550 g. Sizing arithmetic on the 105 mm bore: 216 kN C divided by the 60.0 mm radial section height gives 3.6 kN per section millimetre; the 8550 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 208 kN against C 216 kN gives a 0.96 ratio, typical of a steep-angle axial-oriented design; Pu 6.95 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 3,600 r/min against a 3,800 r/min limiting speed, i.e. a reference-to-limit ratio of 0.95. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "heavy feed and take-up rolls",
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7321-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7321-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7321-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7321-BECBP?",
        "a": "7321 BECBP measures 105 mm bore × 225 mm OD × 49 mm width (4.134 × 8.858 × 1.929 in), mass about 8550 g. SKF 17000 ratings: C 216 kN, C0 208 kN, Pu 6.95 kN, reference speed 3,600 r/min (thermal) and limiting speed 3,800 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7321-BECBP?",
        "a": "With a rotating inner ring use roughly m6 on the 105 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7321-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7321-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×225×49 mm envelope with catalogue ratings within 10 %; 7321 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7321-DECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×225×49 mm envelope with catalogue ratings within 10 %; 7321 DECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7321",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7321 BEP is the basic 105×225×49 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7321-BECBP",
      "7321 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7321-DECBM",
    "brand": "SKF",
    "manufacturer_designation": "7321 DECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 105,
    "D_mm": 225,
    "B_mm": 49,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 216,
    "static_load_kN": 208,
    "fatigue_load_limit_kN": 6.95,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 8550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7321 DECBM is SKF's 105 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 105×225×49 mm to the ISO dimension plan. D marks a two-piece inner ring (split for mounting), E the optimized internal geometry, CB universal matching with Normal clearance and M the machined brass ball-centred cage. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. Envelope 105×225×49 mm (4.134×8.858×1.929 in), 60.0 mm radial section height, C 216 kN, C0 208 kN, Pu 6.95 kN.reference speed 3,600 r/min (thermal) and limiting speed 4,800 r/min (mechanical), catalogue mass 8550 g. Sizing arithmetic on the 105 mm bore: 216 kN C divided by the 60.0 mm radial section height gives 3.6 kN per section millimetre; the 8550 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 49 mm width over a 60.0 mm section yields 0.82 mm of ring width per section millimetre, and the bearing weighs 8550 g for 216 kN of dynamic capacity — about 40 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 3,600 r/min against a 4,800 r/min limiting speed, i.e. a reference-to-limit ratio of 0.75. Split-inner-ring universal execution: the leading D means the inner ring is supplied in two halves to ease mounting and inspection of the rolling elements; E optimized internals, CB Normal-clearance set faces and the machined brass M cage complete the order number.",
    "applications": [
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives",
      "heavy feed and take-up rolls"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "split inner-ring fretting or half-ring mismatch if the two D halves are not kept matched and seated square",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7321-DECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Preload the set against a calculated stand-off dimension — the ground faces of DECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Assign interference to the rotating ring — roughly m6 on a 105 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7321-DECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable DECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7321-DECBM?",
        "a": "7321 DECBM measures 105 mm bore × 225 mm OD × 49 mm width (4.134 × 8.858 × 1.929 in), mass about 8550 g. SKF 17000 ratings: C 216 kN, C0 208 kN, Pu 6.95 kN, reference speed 3,600 r/min (thermal) and limiting speed 4,800 r/min (mechanical)."
      },
      {
        "q": "What does the DECBM suffix mean?",
        "a": "D marks a two-piece inner ring (split for mounting), E the optimized internal geometry, CB universal matching with Normal clearance and M the machined brass ball-centred cage. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7321-DECBM?",
        "a": "With a rotating inner ring use roughly m6 on the 105 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7321-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7321-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×225×49 mm envelope with catalogue ratings within 10 %; 7321 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7321-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×225×49 mm envelope with catalogue ratings within 10 %; 7321 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7321",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7321 BEP is the basic 105×225×49 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7321-DECBM",
      "7321 DECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7222-BEP",
    "brand": "SKF",
    "manufacturer_designation": "7222 BEP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 153,
    "static_load_kN": 143,
    "fatigue_load_limit_kN": 4.9,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 4600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7222 BEP is SKF's 110 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 110×200×38 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.. Envelope 110×200×38 mm (4.331×7.874×1.496 in), 45.0 mm radial section height, C 153 kN, C0 143 kN, Pu 4.9 kN.reference speed 4,000 r/min (thermal) and limiting speed 3,600 r/min (mechanical), catalogue mass 4600 g. The 4.9 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 153/143 kN ratings and 4600 g mass this execution carries about 1.39 kN of C per millimetre of bore. Selection figures for 7222 BEP: the static-to-dynamic ratio C0/C is 0.93, Pu 4.9 kN is about 3 % of C, and catalogue mass works out to roughly 42 g per millimetre of bore. Bore-to-OD planning: OD 200 over bore 110 is a 1.82× step for this size, and the 38 mm width gives a bore/width ratio of 2.89; use these ratios when housing space around the 110 mm shaft is the first constraint. Basic polymer-cage execution: BEP is delivered as an individual open bearing with the 40-degree optimized internals and a glass-fibre PA66 ball-centred cage; it is not ground on the side faces for arbitrary pairing, so a reversing-thrust position should order BECBP for a set rather than mounting two unmatched BEP units.",
    "applications": [
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives",
      "printing and paper-machine rolls"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage creep or embrittlement when the non-universal single bearing is run above 120 °C",
      "raceway staining from water in the lubricant during idle periods",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7222-BEP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Do not mix execution classes inside one set: a universally matchable BEP unit is ground for arbitrary pairing, a basic execution is not.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Assign interference to the rotating ring — roughly m6 on a 110 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7222-BEP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7222 BEP as the single basic pa66 execution; the other order numbers of the 7222 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7222-BEP?",
        "a": "7222 BEP measures 110 mm bore × 200 mm OD × 38 mm width (4.331 × 7.874 × 1.496 in), mass about 4600 g. SKF 17000 ratings: C 153 kN, C0 143 kN, Pu 4.9 kN, reference speed 4,000 r/min (thermal) and limiting speed 3,600 r/min (mechanical)."
      },
      {
        "q": "What does the BEP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. The plain BEP is a basic single bearing: its faces are not ground for universal matching, so defined pairs require the BECBP execution rather than two arbitrary BEP units.."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7222-BEP?",
        "a": "With a rotating inner ring use roughly m6 on the 110 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7222-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7222-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope with catalogue ratings within 10 %; 7222 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7222-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope with catalogue ratings within 10 %; 7222 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7222-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope with catalogue ratings within 10 %; 7222 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-222-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope, but catalogue C/C0 differ between executions (153/143 kN vs 280/325 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7222",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7222 BEP is the basic 110×200×38 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7222-BEP",
      "7222 BEP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7222-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7222 BECBP",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 163,
    "static_load_kN": 156,
    "fatigue_load_limit_kN": 5.3,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 4600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7222 BECBP is SKF's 110 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 110×200×38 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 110×200×38 mm (4.331×7.874×1.496 in), 45.0 mm radial section height, C 163 kN, C0 156 kN, Pu 5.3 kN.reference speed 4,000 r/min (thermal) and limiting speed 4,000 r/min (mechanical), which coincide for this size, catalogue mass 4600 g. Mass and section check: 4600 g inside the 110×200×38 mm outline leaves a 45.0 mm radial section, and the 156 kN static rating is 0.96× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Sizing arithmetic on the 110 mm bore: 163 kN C divided by the 45.0 mm radial section height gives 3.6 kN per section millimetre; the 4600 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 200 over bore 110 is a 1.82× step for this size, and the 38 mm width gives a bore/width ratio of 2.89; use these ratios when housing space around the 110 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BECBP unit is ground for arbitrary pairing, a basic execution is not.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7222-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "One 7222-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7222-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7222-BECBP?",
        "a": "7222 BECBP measures 110 mm bore × 200 mm OD × 38 mm width (4.331 × 7.874 × 1.496 in), mass about 4600 g. SKF 17000 ratings: C 163 kN, C0 156 kN, Pu 5.3 kN, reference speed 4,000 r/min (thermal) and limiting speed 4,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7222-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 4,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7222-BECBP?",
        "a": "The 4,000 r/min reference (thermal) and 4,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7222-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7222-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope with catalogue ratings within 10 %; 7222 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7222-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope with catalogue ratings within 10 %; 7222 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7222-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope with catalogue ratings within 10 %; 7222 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-222-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope, but catalogue C/C0 differ between executions (163/156 kN vs 280/325 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7222",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7222 BEP is the basic 110×200×38 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7222-BECBP",
      "7222 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7222-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7222 BECBY",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 163,
    "static_load_kN": 156,
    "fatigue_load_limit_kN": 5.3,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 4600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7222 BECBY is SKF's 110 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 110×200×38 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 110×200×38 mm (4.331×7.874×1.496 in), 45.0 mm radial section height, C 163 kN, C0 156 kN, Pu 5.3 kN.reference speed 4,000 r/min (thermal) and limiting speed 4,000 r/min (mechanical), which coincide for this size, catalogue mass 4600 g. Sizing arithmetic on the 110 mm bore: 163 kN C divided by the 45.0 mm radial section height gives 3.6 kN per section millimetre; the 4600 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 38 mm width over a 45.0 mm section yields 0.84 mm of ring width per section millimetre, and the bearing weighs 4600 g for 163 kN of dynamic capacity — about 28 g per rated kN. Bore-to-OD planning: OD 200 over bore 110 is a 1.82× step for this size, and the 38 mm width gives a bore/width ratio of 2.89; use these ratios when housing space around the 110 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "process pump and compressor drives",
      "printing and paper-machine rolls",
      "crane sheave and hoist gearboxes"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly m6 on a 110 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Assign interference to the rotating ring — roughly m6 on a 110 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7222-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7222-BECBY?",
        "a": "7222 BECBY measures 110 mm bore × 200 mm OD × 38 mm width (4.331 × 7.874 × 1.496 in), mass about 4600 g. SKF 17000 ratings: C 163 kN, C0 156 kN, Pu 5.3 kN, reference speed 4,000 r/min (thermal) and limiting speed 4,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "Can one 7222-BECBY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7222-BECBY need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7222-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7222-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope with catalogue ratings within 10 %; 7222 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7222-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope with catalogue ratings within 10 %; 7222 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7222-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope with catalogue ratings within 10 %; 7222 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-222-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope, but catalogue C/C0 differ between executions (163/156 kN vs 280/325 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7222",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7222 BEP is the basic 110×200×38 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7222-BECBY",
      "7222 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7222-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7222 BECBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 163,
    "static_load_kN": 156,
    "fatigue_load_limit_kN": 5.3,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 4600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7222 BECBM is SKF's 110 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 110×200×38 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 110×200×38 mm (4.331×7.874×1.496 in), 45.0 mm radial section height, C 163 kN, C0 156 kN, Pu 5.3 kN.reference speed 4,000 r/min (thermal) and limiting speed 5,000 r/min (mechanical), catalogue mass 4600 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,000 r/min while thermal balance under catalogue load sets the 4,000 r/min reference; at dm ≈ 155.0 mm the corresponding dn is approximately 775k mm·r/min. Envelope economics: the 38 mm width over a 45.0 mm section yields 0.84 mm of ring width per section millimetre, and the bearing weighs 4600 g for 163 kN of dynamic capacity — about 28 g per rated kN. Bore-to-OD planning: OD 200 over bore 110 is a 1.82× step for this size, and the 38 mm width gives a bore/width ratio of 2.89; use these ratios when housing space around the 110 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7222-BECBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7222-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7222-BECBM?",
        "a": "7222 BECBM measures 110 mm bore × 200 mm OD × 38 mm width (4.331 × 7.874 × 1.496 in), mass about 4600 g. SKF 17000 ratings: C 163 kN, C0 156 kN, Pu 5.3 kN, reference speed 4,000 r/min (thermal) and limiting speed 5,000 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7222-BECBM?",
        "a": "The 4,000 r/min reference (thermal) and 5,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7222-BECBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7222-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7222-BEP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope with catalogue ratings within 10 %; 7222 BEP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7222-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope with catalogue ratings within 10 %; 7222 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7222-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope with catalogue ratings within 10 %; 7222 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-222-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope, but catalogue C/C0 differ between executions (163/156 kN vs 280/325 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7222",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7222 BEP is the basic 110×200×38 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7222-BECBM",
      "7222 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7322-BEY",
    "brand": "SKF",
    "manufacturer_designation": "7322 BEY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 225,
    "static_load_kN": 224,
    "fatigue_load_limit_kN": 7.2,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7322 BEY is SKF's 110 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 110×240×50 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. The BEY is a basic single bearing with a stamped brass Y cage — a single unit, not a universally matchable one.. Envelope 110×240×50 mm (4.331×9.449×1.969 in), 65.0 mm radial section height, C 225 kN, C0 224 kN, Pu 7.2 kN.reference speed 3,400 r/min (thermal) and limiting speed 3,200 r/min (mechanical), catalogue mass 10000 g. Envelope economics: the 50 mm width over a 65.0 mm section yields 0.77 mm of ring width per section millimetre, and the bearing weighs 10000 g for 225 kN of dynamic capacity — about 44 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 3,200 r/min while thermal balance under catalogue load sets the 3,400 r/min reference; at dm ≈ 175.0 mm the corresponding dn is approximately 560k mm·r/min. Bore-to-OD planning: OD 240 over bore 110 is a 2.18× step for this size, and the 50 mm width gives a bore/width ratio of 2.20; use these ratios when housing space around the 110 mm shaft is the first constraint. Ordering note: BEY is the basic single bearing with the stamped brass strip cage (Y) — light and oil-additive tolerant, but not ground on the side faces for set mounting; order BECBY for a universally matchable stamped-brass unit.",
    "applications": [
      "crane sheave and hoist gearboxes",
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEY establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Assign interference to the rotating ring — roughly m6 on a 110 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7322-BEY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7322 BEY as the single basic stamped brass execution; the other order numbers of the 7322 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7322-BEY?",
        "a": "7322 BEY measures 110 mm bore × 240 mm OD × 50 mm width (4.331 × 9.449 × 1.969 in), mass about 10000 g. SKF 17000 ratings: C 225 kN, C0 224 kN, Pu 7.2 kN, reference speed 3,400 r/min (thermal) and limiting speed 3,200 r/min (mechanical)."
      },
      {
        "q": "What does the BEY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. The BEY is a basic single bearing with a stamped brass Y cage — a single unit, not a universally matchable one.."
      },
      {
        "q": "Which fits should I use for 7322-BEY?",
        "a": "With a rotating inner ring use roughly m6 on the 110 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7322-BEY?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 3,200 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7322-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7322-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-322-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope, but catalogue C/C0 differ between executions (225/224 kN vs 390/480 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7322",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7322 BECBP is the basic 110×240×50 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7322-BEY",
      "7322 BEY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7322-BEM",
    "brand": "SKF",
    "manufacturer_designation": "7322 BEM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 225,
    "static_load_kN": 224,
    "fatigue_load_limit_kN": 7.2,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7322 BEM is SKF's 110 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 110×240×50 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.. Envelope 110×240×50 mm (4.331×9.449×1.969 in), 65.0 mm radial section height, C 225 kN, C0 224 kN, Pu 7.2 kN.reference speed 3,400 r/min (thermal) and limiting speed 3,400 r/min (mechanical), which coincide for this size, catalogue mass 10000 g. The 7.2 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 225/224 kN ratings and 10000 g mass this execution carries about 2.05 kN of C per millimetre of bore. Selection figures for 7322 BEM: the static-to-dynamic ratio C0/C is 1.00, Pu 7.2 kN is about 3 % of C, and catalogue mass works out to roughly 91 g per millimetre of bore. Bore-to-OD planning: OD 240 over bore 110 is a 2.18× step for this size, and the 50 mm width gives a bore/width ratio of 2.20; use these ratios when housing space around the 110 mm shaft is the first constraint. Ordering note: BEM pairs the optimized 40-degree geometry with a machined one-piece brass window cage as a basic (non-universal) single bearing; it is the brass-cage counterpart of the polymer BEP, and universally matchable positions must use the BECBM or BCBM execution instead.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "raceway staining from water in the lubricant during idle periods",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly m6 on a 110 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the chamfer so the 50 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BEM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7322-BEM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7322 BEM as the single basic machined brass execution; the other order numbers of the 7322 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7322-BEM?",
        "a": "7322 BEM measures 110 mm bore × 240 mm OD × 50 mm width (4.331 × 9.449 × 1.969 in), mass about 10000 g. SKF 17000 ratings: C 225 kN, C0 224 kN, Pu 7.2 kN, reference speed 3,400 r/min (thermal) and limiting speed 3,400 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BEM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BEM is a basic single bearing with a machined brass cage — not ground for universal matching; use the BCBM or BECBM execution when defined DB/DF sets are required.."
      },
      {
        "q": "Which grease and fill for 7322-BEM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 3,400 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7322-BEM?",
        "a": "The 3,400 r/min reference (thermal) and 3,400 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7322-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7322-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-322-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope, but catalogue C/C0 differ between executions (225/224 kN vs 390/480 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7322",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7322 BECBP is the basic 110×240×50 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7322-BEM",
      "7322 BEM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7322-BECBP",
    "brand": "SKF",
    "manufacturer_designation": "7322 BECBP",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 240,
    "static_load_kN": 245,
    "fatigue_load_limit_kN": 7.8,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7322 BECBP is SKF's 110 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 110×240×50 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 110×240×50 mm (4.331×9.449×1.969 in), 65.0 mm radial section height, C 240 kN, C0 245 kN, Pu 7.8 kN.reference speed 3,400 r/min (thermal) and limiting speed 3,600 r/min (mechanical), catalogue mass 10000 g. At the printed limiting speed of 3,600 r/min the mean pitch diameter dm ≈ 175.0 mm implies a dn value around 630k mm·r/min; the 3,400 r/min reference speed is the thermal-planning figure under catalogue load. Selection figures for 7322 BECBP: the static-to-dynamic ratio C0/C is 1.02, Pu 7.8 kN is about 3 % of C, and catalogue mass works out to roughly 91 g per millimetre of bore. Bore-to-OD planning: OD 240 over bore 110 is a 2.18× step for this size, and the 50 mm width gives a bore/width ratio of 2.20; use these ratios when housing space around the 110 mm shaft is the first constraint. Universal polymer-cage execution: BECBP is the factory-ground set-mounting version of the basic BEP — both side faces are finish-ground to a controlled stand-off so two units form DB, DF or DT arrangements without shims, while the glass-fibre PA66 ball-centred cage keeps the light, quiet running typical of the P-cage range; CB delivers Normal axial clearance before preload is applied at assembly.",
    "applications": [
      "vibrating screens and shale shaker shafts",
      "centrifuge and separator drives",
      "heavy feed and take-up rolls"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "PA66 cage embrittlement inside a preloaded set where heat accumulates faster than in a single mounting",
      "edge loading from shaft deflection or housing misalignment",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "At 110 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "One 7322-BECBP locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7322-BECBP of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BECBP establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7322-BECBP favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBP bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7322-BECBP?",
        "a": "7322 BECBP measures 110 mm bore × 240 mm OD × 50 mm width (4.331 × 9.449 × 1.969 in), mass about 10000 g. SKF 17000 ratings: C 240 kN, C0 245 kN, Pu 7.8 kN, reference speed 3,400 r/min (thermal) and limiting speed 3,600 r/min (mechanical)."
      },
      {
        "q": "What does the BECBP suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. glass-fibre reinforced PA66 cage, ball-centred (suffix P), with a 120 °C continuous-temperature ceiling. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7322-BECBP?",
        "a": "With a rotating inner ring use roughly m6 on the 110 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7322-BECBP?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume, and stay within the — the PA66 cage sets the ceiling, not the steel. Oil-air or oil-jet lubrication is the choice near the 3,600 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7322-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7322-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-322-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope, but catalogue C/C0 differ between executions (240/245 kN vs 390/480 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7322",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7322 BECBP is the basic 110×240×50 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7322-BECBP",
      "7322 BECBP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7322-BECBY",
    "brand": "SKF",
    "manufacturer_designation": "7322 BECBY",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 240,
    "static_load_kN": 245,
    "fatigue_load_limit_kN": 7.8,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7322 BECBY is SKF's 110 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 110×240×50 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage. Envelope 110×240×50 mm (4.331×9.449×1.969 in), 65.0 mm radial section height, C 240 kN, C0 245 kN, Pu 7.8 kN.reference speed 3,400 r/min (thermal) and limiting speed 3,600 r/min (mechanical), catalogue mass 10000 g. At the printed limiting speed of 3,600 r/min the mean pitch diameter dm ≈ 175.0 mm implies a dn value around 630k mm·r/min; the 3,400 r/min reference speed is the thermal-planning figure under catalogue load. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 3,600 r/min while thermal balance under catalogue load sets the 3,400 r/min reference; at dm ≈ 175.0 mm the corresponding dn is approximately 630k mm·r/min. Bore-to-OD planning: OD 240 over bore 110 is a 2.18× step for this size, and the 50 mm width gives a bore/width ratio of 2.20; use these ratios when housing space around the 110 mm shaft is the first constraint. Cage detail specific to this order number: the Y cage is stamped from brass strip into ball pockets rather than machined from solid, giving a lighter cage assembly and lower centrifugal mass than the M execution; it remains brass (temperature and oil-additive tolerant, unlike PA66) but is the formed-cage design, and the machined-brass BECBM order number remains the choice for severe shock or marginal lubrication.",
    "applications": [
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers",
      "process pump and compressor drives"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "stamped brass cage pocket deformation after shock loading beyond the lighter formed cage capacity",
      "edge loading from shaft deflection or housing misalignment",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BECBY unit is ground for arbitrary pairing, a basic execution is not.",
      "Assign interference to the rotating ring — roughly m6 on a 110 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "The steep 40° angle of 7322-BECBY favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBY bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7322-BECBY?",
        "a": "7322 BECBY measures 110 mm bore × 240 mm OD × 50 mm width (4.331 × 9.449 × 1.969 in), mass about 10000 g. SKF 17000 ratings: C 240 kN, C0 245 kN, Pu 7.8 kN, reference speed 3,400 r/min (thermal) and limiting speed 3,600 r/min (mechanical)."
      },
      {
        "q": "What does the BECBY suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. stamped brass cage, ball-centred (suffix Y) — lighter than the machined M cage but brass rather than polymer. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. BECBY combines the optimized 40° geometry with CB universal clearance and a stamped brass Y cage."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7322-BECBY?",
        "a": "The 3,400 r/min reference (thermal) and 3,600 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7322-BECBY take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7322-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7322-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BECBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BECBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-322-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope, but catalogue C/C0 differ between executions (240/245 kN vs 390/480 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7322",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7322 BECBP is the basic 110×240×50 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7322-BECBY",
      "7322 BECBY"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7322-BECBM",
    "brand": "SKF",
    "manufacturer_designation": "7322 BECBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 240,
    "static_load_kN": 245,
    "fatigue_load_limit_kN": 7.8,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7322 BECBM is SKF's 110 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 110×240×50 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 110×240×50 mm (4.331×9.449×1.969 in), 65.0 mm radial section height, C 240 kN, C0 245 kN, Pu 7.8 kN.reference speed 3,400 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 10000 g. Load balance: C0 245 kN against C 240 kN gives a 1.02 ratio, typical of a steep-angle axial-oriented design; Pu 7.8 kN enters the SKF adjusted-life equation rather than the basic rating life. The 7.8 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 240/245 kN ratings and 10000 g mass this execution carries about 2.18 kN of C per millimetre of bore. Bore-to-OD planning: OD 240 over bore 110 is a 2.18× step for this size, and the 50 mm width gives a bore/width ratio of 2.20; use these ratios when housing space around the 110 mm shaft is the first constraint. Cage detail specific to this order number: the M cage is a one-piece machined brass window cage centred on the balls, chosen for high speeds, thin-film lubrication and shock loads; it is heavier and stiffer than the stamped Y-cage execution and tolerates interrupted oil supply far better than the PA66 or PEEK alternatives. Do not substitute the stamped-brass BECBY order number expecting identical cage behaviour.",
    "applications": [
      "dryer-cylinder pinion shafts",
      "medium and large machine-tool spindles",
      "industrial gearboxes and speed reducers"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "brass cage-pocket smearing under long periods of unloaded running with marginal oil film",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Do not mix execution classes inside one set: a universally matchable BECBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Fillet radii must clear the chamfer so the 50 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7322-BECBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BECBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7322-BECBM?",
        "a": "7322 BECBM measures 110 mm bore × 240 mm OD × 50 mm width (4.331 × 9.449 × 1.969 in), mass about 10000 g. SKF 17000 ratings: C 240 kN, C0 245 kN, Pu 7.8 kN, reference speed 3,400 r/min (thermal) and limiting speed 4,500 r/min (mechanical)."
      },
      {
        "q": "What does the BECBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. E marks the optimized internal design with an enhanced ball complement and race geometry. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7322-BECBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 4,500 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7322-BECBM?",
        "a": "The 3,400 r/min reference (thermal) and 4,500 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7322-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7322-BEY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BEY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BEM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BEM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BECBP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BECBP is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7322-BECBY",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×240×50 mm envelope with catalogue ratings within 10 %; 7322 BECBY is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-322-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope, but catalogue C/C0 differ between executions (240/245 kN vs 390/480 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7322",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "SKF SKF 7322 BECBP is the basic 110×240×50 mm angular-contact page with ratings within 10 % of this execution — same boundary dimensions, verify execution details."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7322-BECBM",
      "7322 BECBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7024-BGM",
    "brand": "SKF",
    "manufacturer_designation": "7024 BGM",
    "series": "7000-series",
    "type": "angular_contact",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 87.1,
    "static_load_kN": 93,
    "fatigue_load_limit_kN": 3.2,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7024 BGM is SKF's 120 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 120×180×28 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 120×180×28 mm (4.724×7.087×1.102 in), 30.0 mm radial section height, C 87.1 kN, C0 93 kN, Pu 3.2 kN.reference speed 4,000 r/min (thermal) and limiting speed 4,000 r/min (mechanical), which coincide for this size, catalogue mass 2400 g. Load balance: C0 93 kN against C 87.1 kN gives a 1.07 ratio, typical of a steep-angle axial-oriented design; Pu 3.2 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 120 mm bore: 87.1 kN C divided by the 30.0 mm radial section height gives 2.9 kN per section millimetre; the 2400 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 180 over bore 120 is a 1.50× step for this size, and the 28 mm width gives a bore/width ratio of 4.29; use these ratios when housing space around the 120 mm shaft is the first constraint. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.",
    "applications": [
      "vertical mill separator drives",
      "heavy industrial gearboxes",
      "large process pumps and compressors"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "G-clearance drift in a large-bore set whose stand-off rings settle under sustained heavy thrust",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BGM unit is ground for arbitrary pairing, a basic execution is not.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Do not mix execution classes inside one set: a universally matchable BGM unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7024-BGM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7024 BGM as the single g brass execution; the other order numbers of the 7024 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7024-BGM?",
        "a": "7024 BGM measures 120 mm bore × 180 mm OD × 28 mm width (4.724 × 7.087 × 1.102 in), mass about 2400 g. SKF 17000 ratings: C 87.1 kN, C0 93 kN, Pu 3.2 kN, reference speed 4,000 r/min (thermal) and limiting speed 4,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BGM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set."
      },
      {
        "q": "Which grease and fill for 7024-BGM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 4,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7024-BGM?",
        "a": "The 4,000 r/min reference (thermal) and 4,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7024",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7024",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7024-BGM",
      "7024 BGM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7224-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7224 BCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 165,
    "static_load_kN": 163,
    "fatigue_load_limit_kN": 5.3,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 5900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7224 BCBM is SKF's 120 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 120×215×40 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 120×215×40 mm (4.724×8.465×1.575 in), 47.5 mm radial section height, C 165 kN, C0 163 kN, Pu 5.3 kN.reference speed 3,600 r/min (thermal) and limiting speed 4,000 r/min (mechanical), catalogue mass 5900 g. Load balance: C0 163 kN against C 165 kN gives a 0.99 ratio, typical of a steep-angle axial-oriented design; Pu 5.3 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 120 mm bore: 165 kN C divided by the 47.5 mm radial section height gives 3.5 kN per section millimetre; the 5900 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 215 over bore 120 is a 1.79× step for this size, and the 40 mm width gives a bore/width ratio of 3.00; use these ratios when housing space around the 120 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "marine propulsion and deck machinery",
      "wind-turbine gearbox shafts",
      "rolling-mill auxiliary drives"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7224-BCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7224-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7224-BCBM?",
        "a": "7224 BCBM measures 120 mm bore × 215 mm OD × 40 mm width (4.724 × 8.465 × 1.575 in), mass about 5900 g. SKF 17000 ratings: C 165 kN, C0 163 kN, Pu 5.3 kN, reference speed 3,600 r/min (thermal) and limiting speed 4,000 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7224-BCBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 4,000 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7224-BCBM?",
        "a": "The 3,600 r/min reference (thermal) and 4,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7224",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7224-BM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×215×40 mm envelope with catalogue ratings within 10 %; 7224 BM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-224-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope, but catalogue C/C0 differ between executions (165/163 kN vs 300/365 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7224-BCBM",
      "7224 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7224-BM",
    "brand": "SKF",
    "manufacturer_designation": "7224 BM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 165,
    "static_load_kN": 163,
    "fatigue_load_limit_kN": 5.3,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 5900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7224 BM is SKF's 120 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 120×215×40 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BM is the non-optimized basic 40° execution with a machined brass cage; it predates the E geometry and is stocked for positions built around its specific figures.. Envelope 120×215×40 mm (4.724×8.465×1.575 in), 47.5 mm radial section height, C 165 kN, C0 163 kN, Pu 5.3 kN.reference speed 3,600 r/min (thermal) and limiting speed 4,000 r/min (mechanical), catalogue mass 5900 g. At the printed limiting speed of 4,000 r/min the mean pitch diameter dm ≈ 167.5 mm implies a dn value around 670k mm·r/min; the 3,600 r/min reference speed is the thermal-planning figure under catalogue load. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,000 r/min while thermal balance under catalogue load sets the 3,600 r/min reference; at dm ≈ 167.5 mm the corresponding dn is approximately 670k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 3,600 r/min against a 4,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.90. Non-optimized basic execution: BM is the earlier 40-degree design without the E internal upgrade, fitted with a machined brass ball-centred cage as a single (non-universal) bearing; quote it for housings and spacers designed around the legacy geometry.",
    "applications": [
      "mineral-processing and crusher drives",
      "large mud pumps and offshore winch drums",
      "sugar mill and cement kiln pinion shafts"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "legacy-geometry cage smearing when the non-E basic bearing is run at speeds developed for the optimized E design",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BM unit is ground for arbitrary pairing, a basic execution is not.",
      "Fillet radii must clear the chamfer so the 40 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Fillet radii must clear the chamfer so the 40 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7224-BM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7224-BM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7224 BM as the single non e brass execution; the other order numbers of the 7224 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7224-BM?",
        "a": "7224 BM measures 120 mm bore × 215 mm OD × 40 mm width (4.724 × 8.465 × 1.575 in), mass about 5900 g. SKF 17000 ratings: C 165 kN, C0 163 kN, Pu 5.3 kN, reference speed 3,600 r/min (thermal) and limiting speed 4,000 r/min (mechanical)."
      },
      {
        "q": "What does the BM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BM is the non-optimized basic 40° execution with a machined brass cage; it predates the E geometry and is stocked for positions built around its specific figures.."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7224-BM?",
        "a": "The 3,600 r/min reference (thermal) and 4,000 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7224-BM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7224",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7224-BCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×215×40 mm envelope with catalogue ratings within 10 %; 7224 BCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-224-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope, but catalogue C/C0 differ between executions (165/163 kN vs 300/365 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7224-BM",
      "7224 BM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7324-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7324 BCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 238,
    "static_load_kN": 250,
    "fatigue_load_limit_kN": 7.65,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7324 BCBM is SKF's 120 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 120×260×55 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 120×260×55 mm (4.724×10.236×2.165 in), 70.0 mm radial section height, C 238 kN, C0 250 kN, Pu 7.65 kN.reference speed 3,000 r/min (thermal) and limiting speed 3,600 r/min (mechanical), catalogue mass 14500 g. At the printed limiting speed of 3,600 r/min the mean pitch diameter dm ≈ 190.0 mm implies a dn value around 684k mm·r/min; the 3,000 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 55 mm width over a 70.0 mm section yields 0.79 mm of ring width per section millimetre, and the bearing weighs 14500 g for 238 kN of dynamic capacity — about 61 g per rated kN. Bore-to-OD planning: OD 260 over bore 120 is a 2.17× step for this size, and the 55 mm width gives a bore/width ratio of 2.18; use these ratios when housing space around the 120 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "mineral-processing and crusher drives",
      "large mud pumps and offshore winch drums",
      "sugar mill and cement kiln pinion shafts"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly m6 on a 120 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the chamfer so the 55 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7324-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7324-BCBM?",
        "a": "7324 BCBM measures 120 mm bore × 260 mm OD × 55 mm width (4.724 × 10.236 × 2.165 in), mass about 14500 g. SKF 17000 ratings: C 238 kN, C0 250 kN, Pu 7.65 kN, reference speed 3,000 r/min (thermal) and limiting speed 3,600 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7324-BCBM?",
        "a": "With a rotating inner ring use roughly m6 on the 120 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7324-BCBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 3,600 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7324",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "QJ-324-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope, but catalogue C/C0 differ between executions (238/250 kN vs 415/530 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7324-BCBM",
      "7324 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7226-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7226 BCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 186,
    "static_load_kN": 193,
    "fatigue_load_limit_kN": 6.1,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 6950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7226 BCBM is SKF's 130 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 130×230×40 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 130×230×40 mm (5.118×9.055×1.575 in), 50.0 mm radial section height, C 186 kN, C0 193 kN, Pu 6.1 kN.reference speed 3,400 r/min (thermal) and limiting speed 3,800 r/min (mechanical), catalogue mass 6950 g. Sizing arithmetic on the 130 mm bore: 186 kN C divided by the 50.0 mm radial section height gives 3.7 kN per section millimetre; the 6950 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 6950 g inside the 130×230×40 mm outline leaves a 50.0 mm radial section, and the 193 kN static rating is 1.04× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 3,400 r/min against a 3,800 r/min limiting speed, i.e. a reference-to-limit ratio of 0.89. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "rolling-mill auxiliary drives",
      "mineral-processing and crusher drives",
      "large mud pumps and offshore winch drums"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "fretting corrosion on a loose rotating shaft seat",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly m6 on a 130 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Fillet radii must clear the chamfer so the 40 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7226-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7226-BCBM?",
        "a": "7226 BCBM measures 130 mm bore × 230 mm OD × 40 mm width (5.118 × 9.055 × 1.575 in), mass about 6950 g. SKF 17000 ratings: C 186 kN, C0 193 kN, Pu 6.1 kN, reference speed 3,400 r/min (thermal) and limiting speed 3,800 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7226-BCBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 3,800 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7226-BCBM?",
        "a": "The 3,400 r/min reference (thermal) and 3,800 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7226",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7226-BM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×230×40 mm envelope with catalogue ratings within 10 %; 7226 BM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-226-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope, but catalogue C/C0 differ between executions (186/193 kN vs 310/400 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7226-BCBM",
      "7226 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7226-BM",
    "brand": "SKF",
    "manufacturer_designation": "7226 BM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 186,
    "static_load_kN": 193,
    "fatigue_load_limit_kN": 6.1,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 6950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7226 BM is SKF's 130 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 130×230×40 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BM is the non-optimized basic 40° execution with a machined brass cage; it predates the E geometry and is stocked for positions built around its specific figures.. Envelope 130×230×40 mm (5.118×9.055×1.575 in), 50.0 mm radial section height, C 186 kN, C0 193 kN, Pu 6.1 kN.reference speed 3,400 r/min (thermal) and limiting speed 3,800 r/min (mechanical), catalogue mass 6950 g. Envelope economics: the 40 mm width over a 50.0 mm section yields 0.80 mm of ring width per section millimetre, and the bearing weighs 6950 g for 186 kN of dynamic capacity — about 37 g per rated kN. Selection figures for 7226 BM: the static-to-dynamic ratio C0/C is 1.04, Pu 6.1 kN is about 3 % of C, and catalogue mass works out to roughly 53 g per millimetre of bore. Bore-to-OD planning: OD 230 over bore 130 is a 1.77× step for this size, and the 40 mm width gives a bore/width ratio of 3.25; use these ratios when housing space around the 130 mm shaft is the first constraint. Non-optimized basic execution: BM is the earlier 40-degree design without the E internal upgrade, fitted with a machined brass ball-centred cage as a single (non-universal) bearing; quote it for housings and spacers designed around the legacy geometry.",
    "applications": [
      "large mud pumps and offshore winch drums",
      "sugar mill and cement kiln pinion shafts",
      "hydraulic press and converter tilt drives"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "legacy-geometry cage smearing when the non-E basic bearing is run at speeds developed for the optimized E design",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Fillet radii must clear the chamfer so the 40 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7226-BM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7226 BM as the single non e brass execution; the other order numbers of the 7226 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7226-BM?",
        "a": "7226 BM measures 130 mm bore × 230 mm OD × 40 mm width (5.118 × 9.055 × 1.575 in), mass about 6950 g. SKF 17000 ratings: C 186 kN, C0 193 kN, Pu 6.1 kN, reference speed 3,400 r/min (thermal) and limiting speed 3,800 r/min (mechanical)."
      },
      {
        "q": "What does the BM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BM is the non-optimized basic 40° execution with a machined brass cage; it predates the E geometry and is stocked for positions built around its specific figures.."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7226-BM?",
        "a": "The 3,400 r/min reference (thermal) and 3,800 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7226-BM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7226",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7226-BCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×230×40 mm envelope with catalogue ratings within 10 %; 7226 BCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-226-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope, but catalogue C/C0 differ between executions (186/193 kN vs 310/400 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7226-BM",
      "7226 BM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7326-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7326 BCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 276,
    "static_load_kN": 305,
    "fatigue_load_limit_kN": 9,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7326 BCBM is SKF's 130 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 130×280×58 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 130×280×58 mm (5.118×11.024×2.283 in), 75.0 mm radial section height, C 276 kN, C0 305 kN, Pu 9 kN.reference speed 2,800 r/min (thermal) and limiting speed 3,400 r/min (mechanical), catalogue mass 17000 g. Selection figures for 7326 BCBM: the static-to-dynamic ratio C0/C is 1.11, Pu 9 kN is about 3 % of C, and catalogue mass works out to roughly 131 g per millimetre of bore. At the printed limiting speed of 3,400 r/min the mean pitch diameter dm ≈ 205.0 mm implies a dn value around 697k mm·r/min; the 2,800 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 2,800 r/min against a 3,400 r/min limiting speed, i.e. a reference-to-limit ratio of 0.82. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "hydraulic press and converter tilt drives",
      "heavy dredge and excavator swing drives",
      "vertical mill separator drives"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "brinelling from pressing the ring home through the balls or from static overload",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7326-BCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7326-BCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7326-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7326-BCBM?",
        "a": "7326 BCBM measures 130 mm bore × 280 mm OD × 58 mm width (5.118 × 11.024 × 2.283 in), mass about 17000 g. SKF 17000 ratings: C 276 kN, C0 305 kN, Pu 9 kN, reference speed 2,800 r/min (thermal) and limiting speed 3,400 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7326-BCBM?",
        "a": "The 2,800 r/min reference (thermal) and 3,400 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7326-BCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7326",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7326-BM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×280×58 mm envelope with catalogue ratings within 10 %; 7326 BM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-326-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope, but catalogue C/C0 differ between executions (276/305 kN vs 455/610 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7326-BCBM",
      "7326 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7326-BM",
    "brand": "SKF",
    "manufacturer_designation": "7326 BM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 276,
    "static_load_kN": 305,
    "fatigue_load_limit_kN": 9,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7326 BM is SKF's 130 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 130×280×58 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BM is the non-optimized basic 40° execution with a machined brass cage; it predates the E geometry and is stocked for positions built around its specific figures.. Envelope 130×280×58 mm (5.118×11.024×2.283 in), 75.0 mm radial section height, C 276 kN, C0 305 kN, Pu 9 kN.reference speed 2,800 r/min (thermal) and limiting speed 3,400 r/min (mechanical), catalogue mass 17000 g. Mass and section check: 17000 g inside the 130×280×58 mm outline leaves a 75.0 mm radial section, and the 305 kN static rating is 1.11× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 3,400 r/min the mean pitch diameter dm ≈ 205.0 mm implies a dn value around 697k mm·r/min; the 2,800 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 280 over bore 130 is a 2.15× step for this size, and the 58 mm width gives a bore/width ratio of 2.24; use these ratios when housing space around the 130 mm shaft is the first constraint. Non-optimized basic execution: BM is the earlier 40-degree design without the E internal upgrade, fitted with a machined brass ball-centred cage as a single (non-universal) bearing; quote it for housings and spacers designed around the legacy geometry.",
    "applications": [
      "heavy industrial gearboxes",
      "large process pumps and compressors",
      "marine propulsion and deck machinery"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "legacy-geometry cage smearing when the non-E basic bearing is run at speeds developed for the optimized E design",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Assign interference to the rotating ring — roughly m6 on a 130 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Assign interference to the rotating ring — roughly m6 on a 130 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7326-BM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7326 BM as the single non e brass execution; the other order numbers of the 7326 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7326-BM?",
        "a": "7326 BM measures 130 mm bore × 280 mm OD × 58 mm width (5.118 × 11.024 × 2.283 in), mass about 17000 g. SKF 17000 ratings: C 276 kN, C0 305 kN, Pu 9 kN, reference speed 2,800 r/min (thermal) and limiting speed 3,400 r/min (mechanical)."
      },
      {
        "q": "What does the BM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BM is the non-optimized basic 40° execution with a machined brass cage; it predates the E geometry and is stocked for positions built around its specific figures.."
      },
      {
        "q": "Which grease and fill for 7326-BM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 3,400 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7326-BM?",
        "a": "The 2,800 r/min reference (thermal) and 3,400 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7326",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7326-BCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×280×58 mm envelope with catalogue ratings within 10 %; 7326 BCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-326-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope, but catalogue C/C0 differ between executions (276/305 kN vs 455/610 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7326-BM",
      "7326 BM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7028-BGM",
    "brand": "SKF",
    "manufacturer_designation": "7028 BGM",
    "series": "7000-series",
    "type": "angular_contact",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 114,
    "static_load_kN": 129,
    "fatigue_load_limit_kN": 4.15,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 3850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7028 BGM is SKF's 140 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 140×210×33 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 140×210×33 mm (5.512×8.268×1.299 in), 35.0 mm radial section height, C 114 kN, C0 129 kN, Pu 4.15 kN.reference speed 3,400 r/min (thermal) and limiting speed 3,400 r/min (mechanical), which coincide for this size, catalogue mass 3850 g. Mass and section check: 3850 g inside the 140×210×33 mm outline leaves a 35.0 mm radial section, and the 129 kN static rating is 1.13× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 4.15 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 114/129 kN ratings and 3850 g mass this execution carries about 0.81 kN of C per millimetre of bore. Bore-to-OD planning: OD 210 over bore 140 is a 1.50× step for this size, and the 33 mm width gives a bore/width ratio of 4.24; use these ratios when housing space around the 140 mm shaft is the first constraint. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.",
    "applications": [
      "mineral-processing and crusher drives",
      "large mud pumps and offshore winch drums",
      "sugar mill and cement kiln pinion shafts"
    ],
    "failure_modes": [
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "G-clearance drift in a large-bore set whose stand-off rings settle under sustained heavy thrust",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Fillet radii must clear the chamfer so the 33 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7028-BGM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "The steep 40° angle of 7028-BGM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7028 BGM as the single g brass execution; the other order numbers of the 7028 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7028-BGM?",
        "a": "7028 BGM measures 140 mm bore × 210 mm OD × 33 mm width (5.512 × 8.268 × 1.299 in), mass about 3850 g. SKF 17000 ratings: C 114 kN, C0 129 kN, Pu 4.15 kN, reference speed 3,400 r/min (thermal) and limiting speed 3,400 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BGM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set."
      },
      {
        "q": "Which grease and fill for 7028-BGM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 3,400 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7028-BGM?",
        "a": "The 3,400 r/min reference (thermal) and 3,400 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7028",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7028",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7028-BGM",
      "7028 BGM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7228-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7228 BCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 199,
    "static_load_kN": 212,
    "fatigue_load_limit_kN": 6.4,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 8850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7228 BCBM is SKF's 140 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 140×250×42 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 140×250×42 mm (5.512×9.843×1.654 in), 55.0 mm radial section height, C 199 kN, C0 212 kN, Pu 6.4 kN.reference speed 3,000 r/min (thermal) and limiting speed 3,600 r/min (mechanical), catalogue mass 8850 g. Mass and section check: 8850 g inside the 140×250×42 mm outline leaves a 55.0 mm radial section, and the 212 kN static rating is 1.07× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 6.4 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 199/212 kN ratings and 8850 g mass this execution carries about 1.42 kN of C per millimetre of bore. Bore-to-OD planning: OD 250 over bore 140 is a 1.79× step for this size, and the 42 mm width gives a bore/width ratio of 3.33; use these ratios when housing space around the 140 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "marine propulsion and deck machinery",
      "wind-turbine gearbox shafts",
      "rolling-mill auxiliary drives"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 42 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7228-BCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7228-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7228-BCBM?",
        "a": "7228 BCBM measures 140 mm bore × 250 mm OD × 42 mm width (5.512 × 9.843 × 1.654 in), mass about 8850 g. SKF 17000 ratings: C 199 kN, C0 212 kN, Pu 6.4 kN, reference speed 3,000 r/min (thermal) and limiting speed 3,600 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7228-BCBM?",
        "a": "With a rotating inner ring use roughly m6 on the 140 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7228",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7228-BM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×250×42 mm envelope with catalogue ratings within 10 %; 7228 BM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-228-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope, but catalogue C/C0 differ between executions (199/212 kN vs 345/475 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7228-BCBM",
      "7228 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7228-BM",
    "brand": "SKF",
    "manufacturer_designation": "7228 BM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 199,
    "static_load_kN": 212,
    "fatigue_load_limit_kN": 6.4,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 8850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7228 BM is SKF's 140 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 140×250×42 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BM is the non-optimized basic 40° execution with a machined brass cage; it predates the E geometry and is stocked for positions built around its specific figures.. Envelope 140×250×42 mm (5.512×9.843×1.654 in), 55.0 mm radial section height, C 199 kN, C0 212 kN, Pu 6.4 kN.reference speed 3,000 r/min (thermal) and limiting speed 3,600 r/min (mechanical), catalogue mass 8850 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 3,600 r/min while thermal balance under catalogue load sets the 3,000 r/min reference; at dm ≈ 195.0 mm the corresponding dn is approximately 702k mm·r/min. At the printed limiting speed of 3,600 r/min the mean pitch diameter dm ≈ 195.0 mm implies a dn value around 702k mm·r/min; the 3,000 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 3,000 r/min against a 3,600 r/min limiting speed, i.e. a reference-to-limit ratio of 0.83. Non-optimized basic execution: BM is the earlier 40-degree design without the E internal upgrade, fitted with a machined brass ball-centred cage as a single (non-universal) bearing; quote it for housings and spacers designed around the legacy geometry.",
    "applications": [
      "heavy dredge and excavator swing drives",
      "vertical mill separator drives",
      "heavy industrial gearboxes"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "legacy-geometry cage smearing when the non-E basic bearing is run at speeds developed for the optimized E design",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 42 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "One 7228-BM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7228-BM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7228 BM as the single non e brass execution; the other order numbers of the 7228 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7228-BM?",
        "a": "7228 BM measures 140 mm bore × 250 mm OD × 42 mm width (5.512 × 9.843 × 1.654 in), mass about 8850 g. SKF 17000 ratings: C 199 kN, C0 212 kN, Pu 6.4 kN, reference speed 3,000 r/min (thermal) and limiting speed 3,600 r/min (mechanical)."
      },
      {
        "q": "What does the BM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BM is the non-optimized basic 40° execution with a machined brass cage; it predates the E geometry and is stocked for positions built around its specific figures.."
      },
      {
        "q": "Which fits should I use for 7228-BM?",
        "a": "With a rotating inner ring use roughly m6 on the 140 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7228-BM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 3,600 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7228",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7228-BCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×250×42 mm envelope with catalogue ratings within 10 %; 7228 BCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-228-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope, but catalogue C/C0 differ between executions (199/212 kN vs 345/475 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7228-BM",
      "7228 BM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7328-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7328 BCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 302,
    "static_load_kN": 345,
    "fatigue_load_limit_kN": 9.8,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "weight_g": 21500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7328 BCBM is SKF's 140 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 140×300×62 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 140×300×62 mm (5.512×11.811×2.441 in), 80.0 mm radial section height, C 302 kN, C0 345 kN, Pu 9.8 kN.reference speed 2,600 r/min (thermal) and limiting speed 3,000 r/min (mechanical), catalogue mass 21500 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 3,000 r/min while thermal balance under catalogue load sets the 2,600 r/min reference; at dm ≈ 220.0 mm the corresponding dn is approximately 660k mm·r/min. Selection figures for 7328 BCBM: the static-to-dynamic ratio C0/C is 1.14, Pu 9.8 kN is about 3 % of C, and catalogue mass works out to roughly 154 g per millimetre of bore. Bore-to-OD planning: OD 300 over bore 140 is a 2.14× step for this size, and the 62 mm width gives a bore/width ratio of 2.26; use these ratios when housing space around the 140 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "large process pumps and compressors",
      "marine propulsion and deck machinery",
      "wind-turbine gearbox shafts"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 62 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "At 140 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7328-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7328-BCBM?",
        "a": "7328 BCBM measures 140 mm bore × 300 mm OD × 62 mm width (5.512 × 11.811 × 2.441 in), mass about 21500 g. SKF 17000 ratings: C 302 kN, C0 345 kN, Pu 9.8 kN, reference speed 2,600 r/min (thermal) and limiting speed 3,000 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7328-BCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7328",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "QJ-328-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×300×62 mm envelope, but catalogue C/C0 differ between executions (302/345 kN vs 500/695 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7328-BCBM",
      "7328 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7030-BGM",
    "brand": "SKF",
    "manufacturer_designation": "7030 BGM",
    "series": "7000-series",
    "type": "angular_contact",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 133,
    "static_load_kN": 146,
    "fatigue_load_limit_kN": 4.55,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "weight_g": 4700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7030 BGM is SKF's 150 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 150×225×35 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 150×225×35 mm (5.906×8.858×1.378 in), 37.5 mm radial section height, C 133 kN, C0 146 kN, Pu 4.55 kN.reference speed 3,200 r/min (thermal) and limiting speed 3,200 r/min (mechanical), which coincide for this size, catalogue mass 4700 g. Envelope economics: the 35 mm width over a 37.5 mm section yields 0.93 mm of ring width per section millimetre, and the bearing weighs 4700 g for 133 kN of dynamic capacity — about 35 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 3,200 r/min while thermal balance under catalogue load sets the 3,200 r/min reference; at dm ≈ 187.5 mm the corresponding dn is approximately 600k mm·r/min. Bore-to-OD planning: OD 225 over bore 150 is a 1.50× step for this size, and the 35 mm width gives a bore/width ratio of 4.29; use these ratios when housing space around the 150 mm shaft is the first constraint. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.",
    "applications": [
      "rolling-mill auxiliary drives",
      "mineral-processing and crusher drives",
      "large mud pumps and offshore winch drums"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "G-clearance drift in a large-bore set whose stand-off rings settle under sustained heavy thrust",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Do not mix execution classes inside one set: a universally matchable BGM unit is ground for arbitrary pairing, a basic execution is not.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BGM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7030-BGM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7030 BGM as the single g brass execution; the other order numbers of the 7030 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7030-BGM?",
        "a": "7030 BGM measures 150 mm bore × 225 mm OD × 35 mm width (5.906 × 8.858 × 1.378 in), mass about 4700 g. SKF 17000 ratings: C 133 kN, C0 146 kN, Pu 4.55 kN, reference speed 3,200 r/min (thermal) and limiting speed 3,200 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BGM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set."
      },
      {
        "q": "Which fits should I use for 7030-BGM?",
        "a": "With a rotating inner ring use roughly m6 on the 150 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7030-BGM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 3,200 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7030",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7030",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7030-BGM",
      "7030 BGM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7230-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7230 BCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 216,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 6.95,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "weight_g": 11500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7230 BCBM is SKF's 150 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 150×270×45 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 150×270×45 mm (5.906×10.63×1.772 in), 60.0 mm radial section height, C 216 kN, C0 240 kN, Pu 6.95 kN.reference speed 2,800 r/min (thermal) and limiting speed 3,200 r/min (mechanical), catalogue mass 11500 g. Selection figures for 7230 BCBM: the static-to-dynamic ratio C0/C is 1.11, Pu 6.95 kN is about 3 % of C, and catalogue mass works out to roughly 77 g per millimetre of bore. At the printed limiting speed of 3,200 r/min the mean pitch diameter dm ≈ 210.0 mm implies a dn value around 672k mm·r/min; the 2,800 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 270 over bore 150 is a 1.80× step for this size, and the 45 mm width gives a bore/width ratio of 3.33; use these ratios when housing space around the 150 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "heavy dredge and excavator swing drives",
      "vertical mill separator drives",
      "heavy industrial gearboxes"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 150 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "One 7230-BCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Fillet radii must clear the chamfer so the 45 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7230-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7230-BCBM?",
        "a": "7230 BCBM measures 150 mm bore × 270 mm OD × 45 mm width (5.906 × 10.63 × 1.772 in), mass about 11500 g. SKF 17000 ratings: C 216 kN, C0 240 kN, Pu 6.95 kN, reference speed 2,800 r/min (thermal) and limiting speed 3,200 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7230-BCBM?",
        "a": "The 2,800 r/min reference (thermal) and 3,200 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7230-BCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7230",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "QJ-230-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope, but catalogue C/C0 differ between executions (216/240 kN vs 400/570 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7230-BCBM",
      "7230 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7330-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7330 BCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 332,
    "static_load_kN": 390,
    "fatigue_load_limit_kN": 10.8,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 26000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7330 BCBM is SKF's 150 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 150×320×65 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 150×320×65 mm (5.906×12.598×2.559 in), 85.0 mm radial section height, C 332 kN, C0 390 kN, Pu 10.8 kN.reference speed 2,400 r/min (thermal) and limiting speed 2,800 r/min (mechanical), catalogue mass 26000 g. The 10.8 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 332/390 kN ratings and 26000 g mass this execution carries about 2.21 kN of C per millimetre of bore. Load balance: C0 390 kN against C 332 kN gives a 1.17 ratio, typical of a steep-angle axial-oriented design; Pu 10.8 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 320 over bore 150 is a 2.13× step for this size, and the 65 mm width gives a bore/width ratio of 2.31; use these ratios when housing space around the 150 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "hydraulic press and converter tilt drives",
      "heavy dredge and excavator swing drives",
      "vertical mill separator drives"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7330-BCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7330-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7330-BCBM?",
        "a": "7330 BCBM measures 150 mm bore × 320 mm OD × 65 mm width (5.906 × 12.598 × 2.559 in), mass about 26000 g. SKF 17000 ratings: C 332 kN, C0 390 kN, Pu 10.8 kN, reference speed 2,400 r/min (thermal) and limiting speed 2,800 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7330-BCBM?",
        "a": "With a rotating inner ring use roughly m6 on the 150 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7330",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "QJ-330-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×320×65 mm envelope, but catalogue C/C0 differ between executions (332/390 kN vs 530/765 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7330-BCBM",
      "7330 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7232-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7232 BCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 255,
    "static_load_kN": 300,
    "fatigue_load_limit_kN": 8.5,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "weight_g": 14000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7232 BCBM is SKF's 160 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 160×290×48 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 160×290×48 mm (6.299×11.417×1.89 in), 65.0 mm radial section height, C 255 kN, C0 300 kN, Pu 8.5 kN.reference speed 2,600 r/min (thermal) and limiting speed 3,000 r/min (mechanical), catalogue mass 14000 g. At the printed limiting speed of 3,000 r/min the mean pitch diameter dm ≈ 225.0 mm implies a dn value around 675k mm·r/min; the 2,600 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 48 mm width over a 65.0 mm section yields 0.74 mm of ring width per section millimetre, and the bearing weighs 14000 g for 255 kN of dynamic capacity — about 55 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 2,600 r/min against a 3,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.87. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "marine propulsion and deck machinery",
      "wind-turbine gearbox shafts",
      "rolling-mill auxiliary drives"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "edge loading from shaft deflection or housing misalignment",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7232-BCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Assign interference to the rotating ring — roughly m6 on a 160 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7232-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7232-BCBM?",
        "a": "7232 BCBM measures 160 mm bore × 290 mm OD × 48 mm width (6.299 × 11.417 × 1.89 in), mass about 14000 g. SKF 17000 ratings: C 255 kN, C0 300 kN, Pu 8.5 kN, reference speed 2,600 r/min (thermal) and limiting speed 3,000 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use for 7232-BCBM?",
        "a": "With a rotating inner ring use roughly m6 on the 160 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7232-BCBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 3,000 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7232",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×290×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "QJ-232-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×290×48 mm envelope, but catalogue C/C0 differ between executions (255/300 kN vs 450/670 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7232-BCBM",
      "7232 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7034-BGM",
    "brand": "SKF",
    "manufacturer_designation": "7034 BGM",
    "series": "7000-series",
    "type": "angular_contact",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 172,
    "static_load_kN": 204,
    "fatigue_load_limit_kN": 5.85,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 7650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7034 BGM is SKF's 170 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 170×260×42 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 170×260×42 mm (6.693×10.236×1.654 in), 45.0 mm radial section height, C 172 kN, C0 204 kN, Pu 5.85 kN.reference speed 2,800 r/min (thermal) and limiting speed 2,800 r/min (mechanical), which coincide for this size, catalogue mass 7650 g. Selection figures for 7034 BGM: the static-to-dynamic ratio C0/C is 1.19, Pu 5.85 kN is about 3 % of C, and catalogue mass works out to roughly 45 g per millimetre of bore. At the printed limiting speed of 2,800 r/min the mean pitch diameter dm ≈ 215.0 mm implies a dn value around 602k mm·r/min; the 2,800 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 260 over bore 170 is a 1.53× step for this size, and the 42 mm width gives a bore/width ratio of 4.05; use these ratios when housing space around the 170 mm shaft is the first constraint. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.",
    "applications": [
      "heavy industrial gearboxes",
      "large process pumps and compressors",
      "marine propulsion and deck machinery"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "G-clearance drift in a large-bore set whose stand-off rings settle under sustained heavy thrust",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 170 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Assign interference to the rotating ring — roughly m6 on a 170 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7034-BGM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7034-BGM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7034 BGM as the single g brass execution; the other order numbers of the 7034 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7034-BGM?",
        "a": "7034 BGM measures 170 mm bore × 260 mm OD × 42 mm width (6.693 × 10.236 × 1.654 in), mass about 7650 g. SKF 17000 ratings: C 172 kN, C0 204 kN, Pu 5.85 kN, reference speed 2,800 r/min (thermal) and limiting speed 2,800 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BGM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set."
      },
      {
        "q": "Which fits should I use for 7034-BGM?",
        "a": "With a rotating inner ring use roughly m6 on the 170 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7034-BGM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 2,800 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7034",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7034",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7034-BGM",
      "7034 BGM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7234-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7234 BCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 281,
    "static_load_kN": 345,
    "fatigue_load_limit_kN": 9.5,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 17500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7234 BCBM is SKF's 170 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 170×310×52 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 170×310×52 mm (6.693×12.205×2.047 in), 70.0 mm radial section height, C 281 kN, C0 345 kN, Pu 9.5 kN.reference speed 2,400 r/min (thermal) and limiting speed 2,800 r/min (mechanical), catalogue mass 17500 g. Envelope economics: the 52 mm width over a 70.0 mm section yields 0.74 mm of ring width per section millimetre, and the bearing weighs 17500 g for 281 kN of dynamic capacity — about 62 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 2,800 r/min while thermal balance under catalogue load sets the 2,400 r/min reference; at dm ≈ 240.0 mm the corresponding dn is approximately 672k mm·r/min. Bore-to-OD planning: OD 310 over bore 170 is a 1.82× step for this size, and the 52 mm width gives a bore/width ratio of 3.27; use these ratios when housing space around the 170 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "vertical mill separator drives",
      "heavy industrial gearboxes",
      "large process pumps and compressors"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Assign interference to the rotating ring — roughly m6 on a 170 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7234-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7234-BCBM?",
        "a": "7234 BCBM measures 170 mm bore × 310 mm OD × 52 mm width (6.693 × 12.205 × 2.047 in), mass about 17500 g. SKF 17000 ratings: C 281 kN, C0 345 kN, Pu 9.5 kN, reference speed 2,400 r/min (thermal) and limiting speed 2,800 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7234-BCBM?",
        "a": "The 2,400 r/min reference (thermal) and 2,800 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7234-BCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7234",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×310×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "QJ-234-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×310×52 mm envelope, but catalogue C/C0 differ between executions (281/345 kN vs 455/720 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7234-BCBM",
      "7234 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7334-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7334 BCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 390,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 12.7,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 36000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7334 BCBM is SKF's 170 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 170×360×72 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 170×360×72 mm (6.693×14.173×2.835 in), 95.0 mm radial section height, C 390 kN, C0 490 kN, Pu 12.7 kN.reference speed 2,200 r/min (thermal) and limiting speed 2,600 r/min (mechanical), catalogue mass 36000 g. Sizing arithmetic on the 170 mm bore: 390 kN C divided by the 95.0 mm radial section height gives 4.1 kN per section millimetre; the 36000 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 36000 g inside the 170×360×72 mm outline leaves a 95.0 mm radial section, and the 490 kN static rating is 1.26× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 360 over bore 170 is a 2.12× step for this size, and the 72 mm width gives a bore/width ratio of 2.36; use these ratios when housing space around the 170 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "heavy dredge and excavator swing drives",
      "vertical mill separator drives",
      "heavy industrial gearboxes"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "One 7334-BCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "One 7334-BCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7334-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7334-BCBM?",
        "a": "7334 BCBM measures 170 mm bore × 360 mm OD × 72 mm width (6.693 × 14.173 × 2.835 in), mass about 36000 g. SKF 17000 ratings: C 390 kN, C0 490 kN, Pu 12.7 kN, reference speed 2,200 r/min (thermal) and limiting speed 2,600 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7334-BCBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 2,600 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7334-BCBM?",
        "a": "The 2,200 r/min reference (thermal) and 2,600 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7334",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "QJ-334-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×360×72 mm envelope, but catalogue C/C0 differ between executions (390/490 kN vs 655/1040 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7334-BCBM",
      "7334 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7036-BGM",
    "brand": "SKF",
    "manufacturer_designation": "7036 BGM",
    "series": "7000-series",
    "type": "angular_contact",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 195,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 6.7,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7036 BGM is SKF's 180 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 180×280×46 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 180×280×46 mm (7.087×11.024×1.811 in), 50.0 mm radial section height, C 195 kN, C0 240 kN, Pu 6.7 kN.reference speed 2,600 r/min (thermal) and limiting speed 2,600 r/min (mechanical), which coincide for this size, catalogue mass 10000 g. At the printed limiting speed of 2,600 r/min the mean pitch diameter dm ≈ 230.0 mm implies a dn value around 598k mm·r/min; the 2,600 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 46 mm width over a 50.0 mm section yields 0.92 mm of ring width per section millimetre, and the bearing weighs 10000 g for 195 kN of dynamic capacity — about 51 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 2,600 r/min against a 2,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.",
    "applications": [
      "sugar mill and cement kiln pinion shafts",
      "hydraulic press and converter tilt drives",
      "heavy dredge and excavator swing drives"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "G-clearance drift in a large-bore set whose stand-off rings settle under sustained heavy thrust",
      "edge loading from shaft deflection or housing misalignment",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 46 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "At 180 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Do not mix execution classes inside one set: a universally matchable BGM unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7036-BGM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7036 BGM as the single g brass execution; the other order numbers of the 7036 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7036-BGM?",
        "a": "7036 BGM measures 180 mm bore × 280 mm OD × 46 mm width (7.087 × 11.024 × 1.811 in), mass about 10000 g. SKF 17000 ratings: C 195 kN, C0 240 kN, Pu 6.7 kN, reference speed 2,600 r/min (thermal) and limiting speed 2,600 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BGM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set."
      },
      {
        "q": "What minimum axial load does 7036-BGM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7036",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×280×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7036",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7036-BGM",
      "7036 BGM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7236-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7236 BCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 291,
    "static_load_kN": 375,
    "fatigue_load_limit_kN": 10,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7236 BCBM is SKF's 180 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 180×320×52 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 180×320×52 mm (7.087×12.598×2.047 in), 70.0 mm radial section height, C 291 kN, C0 375 kN, Pu 10 kN.reference speed 2,400 r/min (thermal) and limiting speed 2,600 r/min (mechanical), catalogue mass 18000 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 2,600 r/min while thermal balance under catalogue load sets the 2,400 r/min reference; at dm ≈ 250.0 mm the corresponding dn is approximately 650k mm·r/min. Selection figures for 7236 BCBM: the static-to-dynamic ratio C0/C is 1.29, Pu 10 kN is about 3 % of C, and catalogue mass works out to roughly 100 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 2,400 r/min against a 2,600 r/min limiting speed, i.e. a reference-to-limit ratio of 0.92. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "rolling-mill auxiliary drives",
      "mineral-processing and crusher drives",
      "large mud pumps and offshore winch drums"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly m6 on a 180 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Fillet radii must clear the chamfer so the 52 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7236-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7236-BCBM?",
        "a": "7236 BCBM measures 180 mm bore × 320 mm OD × 52 mm width (7.087 × 12.598 × 2.047 in), mass about 18000 g. SKF 17000 ratings: C 291 kN, C0 375 kN, Pu 10 kN, reference speed 2,400 r/min (thermal) and limiting speed 2,600 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7236-BCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7236",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×320×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "QJ-236-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×320×52 mm envelope, but catalogue C/C0 differ between executions (291/375 kN vs 475/765 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7236-BCBM",
      "7236 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7336-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7336 BCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 410,
    "static_load_kN": 540,
    "fatigue_load_limit_kN": 13.7,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 42000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7336 BCBM is SKF's 180 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 180×380×75 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 180×380×75 mm (7.087×14.961×2.953 in), 100.0 mm radial section height, C 410 kN, C0 540 kN, Pu 13.7 kN.reference speed 2,000 r/min (thermal) and limiting speed 2,400 r/min (mechanical), catalogue mass 42000 g. Load balance: C0 540 kN against C 410 kN gives a 1.32 ratio, typical of a steep-angle axial-oriented design; Pu 13.7 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 180 mm bore: 410 kN C divided by the 100.0 mm radial section height gives 4.1 kN per section millimetre; the 42000 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 2,000 r/min against a 2,400 r/min limiting speed, i.e. a reference-to-limit ratio of 0.83. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "hydraulic press and converter tilt drives",
      "heavy dredge and excavator swing drives",
      "vertical mill separator drives"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7336-BCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7336-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7336-BCBM?",
        "a": "7336 BCBM measures 180 mm bore × 380 mm OD × 75 mm width (7.087 × 14.961 × 2.953 in), mass about 42000 g. SKF 17000 ratings: C 410 kN, C0 540 kN, Pu 13.7 kN, reference speed 2,000 r/min (thermal) and limiting speed 2,400 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7336-BCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7336-BCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7336",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "QJ-336-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×380×75 mm envelope, but catalogue C/C0 differ between executions (410/540 kN vs 680/1100 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7336-BCBM",
      "7336 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7038-BGM",
    "brand": "SKF",
    "manufacturer_designation": "7038 BGM",
    "series": "7000-series",
    "type": "angular_contact",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 199,
    "static_load_kN": 255,
    "fatigue_load_limit_kN": 6.95,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7038 BGM is SKF's 190 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 190×290×46 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 190×290×46 mm (7.48×11.417×1.811 in), 50.0 mm radial section height, C 199 kN, C0 255 kN, Pu 6.95 kN.reference speed 2,400 r/min (thermal) and limiting speed 2,400 r/min (mechanical), which coincide for this size, catalogue mass 10500 g. Envelope economics: the 46 mm width over a 50.0 mm section yields 0.92 mm of ring width per section millimetre, and the bearing weighs 10500 g for 199 kN of dynamic capacity — about 53 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 2,400 r/min while thermal balance under catalogue load sets the 2,400 r/min reference; at dm ≈ 240.0 mm the corresponding dn is approximately 576k mm·r/min. Bore-to-OD planning: OD 290 over bore 190 is a 1.53× step for this size, and the 46 mm width gives a bore/width ratio of 4.13; use these ratios when housing space around the 190 mm shaft is the first constraint. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.",
    "applications": [
      "mineral-processing and crusher drives",
      "large mud pumps and offshore winch drums",
      "sugar mill and cement kiln pinion shafts"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "G-clearance drift in a large-bore set whose stand-off rings settle under sustained heavy thrust",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Do not mix execution classes inside one set: a universally matchable BGM unit is ground for arbitrary pairing, a basic execution is not.",
      "Fillet radii must clear the chamfer so the 46 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7038-BGM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "The steep 40° angle of 7038-BGM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7038 BGM as the single g brass execution; the other order numbers of the 7038 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7038-BGM?",
        "a": "7038 BGM measures 190 mm bore × 290 mm OD × 46 mm width (7.48 × 11.417 × 1.811 in), mass about 10500 g. SKF 17000 ratings: C 199 kN, C0 255 kN, Pu 6.95 kN, reference speed 2,400 r/min (thermal) and limiting speed 2,400 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BGM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7038-BGM?",
        "a": "The 2,400 r/min reference (thermal) and 2,400 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7038-BGM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7038",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×290×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7038",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7038-BGM",
      "7038 BGM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7238-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7238 BCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 307,
    "static_load_kN": 405,
    "fatigue_load_limit_kN": 10.4,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 22000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7238 BCBM is SKF's 190 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 190×340×55 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 190×340×55 mm (7.48×13.386×2.165 in), 75.0 mm radial section height, C 307 kN, C0 405 kN, Pu 10.4 kN.reference speed 2,000 r/min (thermal) and limiting speed 2,600 r/min (mechanical), catalogue mass 22000 g. Selection figures for 7238 BCBM: the static-to-dynamic ratio C0/C is 1.32, Pu 10.4 kN is about 3 % of C, and catalogue mass works out to roughly 116 g per millimetre of bore. At the printed limiting speed of 2,600 r/min the mean pitch diameter dm ≈ 265.0 mm implies a dn value around 689k mm·r/min; the 2,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 340 over bore 190 is a 1.79× step for this size, and the 55 mm width gives a bore/width ratio of 3.45; use these ratios when housing space around the 190 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "mineral-processing and crusher drives",
      "large mud pumps and offshore winch drums",
      "sugar mill and cement kiln pinion shafts"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "One 7238-BCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Fillet radii must clear the chamfer so the 55 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "The steep 40° angle of 7238-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7238-BCBM?",
        "a": "7238 BCBM measures 190 mm bore × 340 mm OD × 55 mm width (7.48 × 13.386 × 2.165 in), mass about 22000 g. SKF 17000 ratings: C 307 kN, C0 405 kN, Pu 10.4 kN, reference speed 2,000 r/min (thermal) and limiting speed 2,600 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7238-BCBM?",
        "a": "The 2,000 r/min reference (thermal) and 2,600 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      },
      {
        "q": "Can one 7238-BCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7238",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "QJ-238-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×340×55 mm envelope, but catalogue C/C0 differ between executions (307/405 kN vs 510/850 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7238-BCBM",
      "7238 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7338-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7338 BCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 442,
    "static_load_kN": 600,
    "fatigue_load_limit_kN": 14.6,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 48500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7338 BCBM is SKF's 190 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 190×400×78 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 190×400×78 mm (7.48×15.748×3.071 in), 105.0 mm radial section height, C 442 kN, C0 600 kN, Pu 14.6 kN.reference speed 2,000 r/min (thermal) and limiting speed 2,200 r/min (mechanical), catalogue mass 48500 g. The 14.6 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 442/600 kN ratings and 48500 g mass this execution carries about 2.33 kN of C per millimetre of bore. Load balance: C0 600 kN against C 442 kN gives a 1.36 ratio, typical of a steep-angle axial-oriented design; Pu 14.6 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 400 over bore 190 is a 2.11× step for this size, and the 78 mm width gives a bore/width ratio of 2.44; use these ratios when housing space around the 190 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "large mud pumps and offshore winch drums",
      "sugar mill and cement kiln pinion shafts",
      "hydraulic press and converter tilt drives"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "Assign interference to the rotating ring — roughly m6 on a 190 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "The steep 40° angle of 7338-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7338-BCBM?",
        "a": "7338 BCBM measures 190 mm bore × 400 mm OD × 78 mm width (7.48 × 15.748 × 3.071 in), mass about 48500 g. SKF 17000 ratings: C 442 kN, C0 600 kN, Pu 14.6 kN, reference speed 2,000 r/min (thermal) and limiting speed 2,200 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7338-BCBM?",
        "a": "With a rotating inner ring use roughly m6 on the 190 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7338",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "QJ-338-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×400×78 mm envelope, but catalogue C/C0 differ between executions (442/600 kN vs 702/1160 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7338-BCBM",
      "7338 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7040-BGM",
    "brand": "SKF",
    "manufacturer_designation": "7040 BGM",
    "series": "7000-series",
    "type": "angular_contact",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 225,
    "static_load_kN": 290,
    "fatigue_load_limit_kN": 7.8,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7040 BGM is SKF's 200 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 200×310×51 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 200×310×51 mm (7.874×12.205×2.008 in), 55.0 mm radial section height, C 225 kN, C0 290 kN, Pu 7.8 kN.reference speed 2,200 r/min (thermal) and limiting speed 2,200 r/min (mechanical), which coincide for this size, catalogue mass 18000 g. The 7.8 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 225/290 kN ratings and 18000 g mass this execution carries about 1.13 kN of C per millimetre of bore. Mass and section check: 18000 g inside the 200×310×51 mm outline leaves a 55.0 mm radial section, and the 290 kN static rating is 1.29× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 2,200 r/min against a 2,200 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.",
    "applications": [
      "heavy dredge and excavator swing drives",
      "vertical mill separator drives",
      "heavy industrial gearboxes"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "G-clearance drift in a large-bore set whose stand-off rings settle under sustained heavy thrust",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BGM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "One 7040-BGM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "At 200 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Fillet radii must clear the chamfer so the 51 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7040-BGM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7040 BGM as the single g brass execution; the other order numbers of the 7040 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7040-BGM?",
        "a": "7040 BGM measures 200 mm bore × 310 mm OD × 51 mm width (7.874 × 12.205 × 2.008 in), mass about 18000 g. SKF 17000 ratings: C 225 kN, C0 290 kN, Pu 7.8 kN, reference speed 2,200 r/min (thermal) and limiting speed 2,200 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BGM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7040-BGM?",
        "a": "With a rotating inner ring use roughly m6 on the 200 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7040",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×310×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "7040",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7040-BGM",
      "7040 BGM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7240-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7240 BCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 325,
    "static_load_kN": 430,
    "fatigue_load_limit_kN": 11,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "weight_g": 25000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7240 BCBM is SKF's 200 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 200×360×58 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 200×360×58 mm (7.874×14.173×2.283 in), 80.0 mm radial section height, C 325 kN, C0 430 kN, Pu 11 kN.reference speed 2,000 r/min (thermal) and limiting speed 2,400 r/min (mechanical), catalogue mass 25000 g. The 11 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 325/430 kN ratings and 25000 g mass this execution carries about 1.63 kN of C per millimetre of bore. Mass and section check: 25000 g inside the 200×360×58 mm outline leaves a 80.0 mm radial section, and the 430 kN static rating is 1.32× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 2,000 r/min against a 2,400 r/min limiting speed, i.e. a reference-to-limit ratio of 0.83. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "rolling-mill auxiliary drives",
      "mineral-processing and crusher drives",
      "large mud pumps and offshore winch drums"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7240-BCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Reference and limiting speeds are different ceilings: design to both, and remember preload and oil/air cooling move the real thermal limit far from the catalogue reference value.",
      "At 200 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7240-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7240-BCBM?",
        "a": "7240 BCBM measures 200 mm bore × 360 mm OD × 58 mm width (7.874 × 14.173 × 2.283 in), mass about 25000 g. SKF 17000 ratings: C 325 kN, C0 430 kN, Pu 11 kN, reference speed 2,000 r/min (thermal) and limiting speed 2,400 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7240-BCBM?",
        "a": "With a rotating inner ring use roughly m6 on the 200 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7240",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×360×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "QJ-240-N2MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×360×58 mm envelope, but catalogue C/C0 differ between executions (325/430 kN vs 540/915 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7240-BCBM",
      "7240 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7340-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7340 BCBM",
    "series": "7300-series",
    "type": "angular_contact",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 462,
    "static_load_kN": 655,
    "fatigue_load_limit_kN": 15.6,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 53000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7340 BCBM is SKF's 200 mm-bore single-row angular-contact ball bearing in the 7300 series, nominal 40° (B) contact angle, 200×420×80 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 200×420×80 mm (7.874×16.535×3.15 in), 110.0 mm radial section height, C 462 kN, C0 655 kN, Pu 15.6 kN.reference speed 1,900 r/min (thermal) and limiting speed 2,200 r/min (mechanical), catalogue mass 53000 g. Selection figures for 7340 BCBM: the static-to-dynamic ratio C0/C is 1.42, Pu 15.6 kN is about 3 % of C, and catalogue mass works out to roughly 265 g per millimetre of bore. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 2,200 r/min while thermal balance under catalogue load sets the 1,900 r/min reference; at dm ≈ 310.0 mm the corresponding dn is approximately 682k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 1,900 r/min against a 2,200 r/min limiting speed, i.e. a reference-to-limit ratio of 0.86. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "heavy dredge and excavator swing drives",
      "vertical mill separator drives",
      "heavy industrial gearboxes"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.",
      "One 7340-BCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7340-BCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "One 7340-BCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "The steep 40° angle of 7340-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7340-BCBM?",
        "a": "7340 BCBM measures 200 mm bore × 420 mm OD × 80 mm width (7.874 × 16.535 × 3.15 in), mass about 53000 g. SKF 17000 ratings: C 462 kN, C0 655 kN, Pu 15.6 kN, reference speed 1,900 r/min (thermal) and limiting speed 2,200 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What minimum axial load does 7340-BCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7340",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "7340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7340-BCBM",
      "7340 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7044-BGM",
    "brand": "SKF",
    "manufacturer_designation": "7044 BGM",
    "series": "7000-series",
    "type": "angular_contact",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 255,
    "static_load_kN": 355,
    "fatigue_load_limit_kN": 9,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7044 BGM is SKF's 220 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 220×340×56 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 220×340×56 mm (8.661×13.386×2.205 in), 60.0 mm radial section height, C 255 kN, C0 355 kN, Pu 9 kN.reference speed 2,000 r/min (thermal) and limiting speed 2,000 r/min (mechanical), which coincide for this size, catalogue mass 18000 g. Sizing arithmetic on the 220 mm bore: 255 kN C divided by the 60.0 mm radial section height gives 4.3 kN per section millimetre; the 18000 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 355 kN against C 255 kN gives a 1.39 ratio, typical of a steep-angle axial-oriented design; Pu 9 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 2,000 r/min against a 2,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.",
    "applications": [
      "wind-turbine gearbox shafts",
      "rolling-mill auxiliary drives",
      "mineral-processing and crusher drives"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "G-clearance drift in a large-bore set whose stand-off rings settle under sustained heavy thrust",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "At 220 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7044-BGM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7044 BGM as the single g brass execution; the other order numbers of the 7044 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7044-BGM?",
        "a": "7044 BGM measures 220 mm bore × 340 mm OD × 56 mm width (8.661 × 13.386 × 2.205 in), mass about 18000 g. SKF 17000 ratings: C 255 kN, C0 355 kN, Pu 9 kN, reference speed 2,000 r/min (thermal) and limiting speed 2,000 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BGM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set."
      },
      {
        "q": "Can one 7044-BGM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7044-BGM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7044",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7044-BGM",
      "7044 BGM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7244-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7244 BCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 390,
    "static_load_kN": 560,
    "fatigue_load_limit_kN": 13.4,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7244 BCBM is SKF's 220 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 220×400×65 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 220×400×65 mm (8.661×15.748×2.559 in), 90.0 mm radial section height, C 390 kN, C0 560 kN, Pu 13.4 kN.reference speed 1,900 r/min (thermal) and limiting speed 2,200 r/min (mechanical), catalogue mass 37000 g. Sizing arithmetic on the 220 mm bore: 390 kN C divided by the 90.0 mm radial section height gives 4.3 kN per section millimetre; the 37000 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 560 kN against C 390 kN gives a 1.44 ratio, typical of a steep-angle axial-oriented design; Pu 13.4 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 1,900 r/min against a 2,200 r/min limiting speed, i.e. a reference-to-limit ratio of 0.86. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "mineral-processing and crusher drives",
      "large mud pumps and offshore winch drums",
      "sugar mill and cement kiln pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Preload the set against a calculated stand-off dimension — the ground faces of BCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Fillet radii must clear the chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "One 7244-BCBM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7244-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7244-BCBM?",
        "a": "7244 BCBM measures 220 mm bore × 400 mm OD × 65 mm width (8.661 × 15.748 × 2.559 in), mass about 37000 g. SKF 17000 ratings: C 390 kN, C0 560 kN, Pu 13.4 kN, reference speed 1,900 r/min (thermal) and limiting speed 2,200 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which grease and fill for 7244-BCBM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 2,200 r/min ceiling."
      },
      {
        "q": "What do the reference and limiting speeds mean for 7244-BCBM?",
        "a": "The 1,900 r/min reference (thermal) and 2,200 r/min limiting (mechanical) speeds are catalogue conditions; preload, lubrication and heat removal move the permissible value, so re-calculate for the actual arrangement."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7244-BCBM",
      "7244 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7048-BGM",
    "brand": "SKF",
    "manufacturer_designation": "7048 BGM",
    "series": "7000-series",
    "type": "angular_contact",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 260,
    "static_load_kN": 375,
    "fatigue_load_limit_kN": 9.15,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "weight_g": 19000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7048 BGM is SKF's 240 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 240×360×56 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 240×360×56 mm (9.449×14.173×2.205 in), 60.0 mm radial section height, C 260 kN, C0 375 kN, Pu 9.15 kN.reference speed 1,900 r/min (thermal) and limiting speed 1,900 r/min (mechanical), which coincide for this size, catalogue mass 19000 g. The 9.15 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 260/375 kN ratings and 19000 g mass this execution carries about 1.08 kN of C per millimetre of bore. Mass and section check: 19000 g inside the 240×360×56 mm outline leaves a 60.0 mm radial section, and the 375 kN static rating is 1.44× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 1,900 r/min against a 1,900 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.",
    "applications": [
      "wind-turbine gearbox shafts",
      "rolling-mill auxiliary drives",
      "mineral-processing and crusher drives"
    ],
    "failure_modes": [
      "fretting at the ground set faces of a universal pair whose clamp torque relaxes",
      "raceway spalling from axial overload beyond the single-direction thrust rating",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "G-clearance drift in a large-bore set whose stand-off rings settle under sustained heavy thrust",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Mount by induction-heating the inner ring to max 120 °C; driving the bearing home through the outer ring or balls brinells the asymmetric raceway.",
      "One 7048-BGM locates the shaft in one axial direction only; reversing-thrust positions need a DB or DF pair — or a double-row bearing — with preload set from the load diagram, never from assembly feel.",
      "Fillet radii must clear the chamfer so the 56 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "The steep 40° angle of 7048-BGM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7048 BGM as the single g brass execution; the other order numbers of the 7048 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7048-BGM?",
        "a": "7048 BGM measures 240 mm bore × 360 mm OD × 56 mm width (9.449 × 14.173 × 2.205 in), mass about 19000 g. SKF 17000 ratings: C 260 kN, C0 375 kN, Pu 9.15 kN, reference speed 1,900 r/min (thermal) and limiting speed 1,900 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BGM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set."
      },
      {
        "q": "Can one 7048-BGM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7048-BGM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7048",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7048-BGM",
      "7048 BGM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7248-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7248 BCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 449,
    "static_load_kN": 670,
    "fatigue_load_limit_kN": 15.3,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 49000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7248 BCBM is SKF's 240 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 240×440×72 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 240×440×72 mm (9.449×17.323×2.835 in), 100.0 mm radial section height, C 449 kN, C0 670 kN, Pu 15.3 kN.reference speed 1,600 r/min (thermal) and limiting speed 2,600 r/min (mechanical), catalogue mass 49000 g. The 15.3 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 449/670 kN ratings and 49000 g mass this execution carries about 1.87 kN of C per millimetre of bore. Mass and section check: 49000 g inside the 240×440×72 mm outline leaves a 100.0 mm radial section, and the 670 kN static rating is 1.49× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 1,600 r/min against a 2,600 r/min limiting speed, i.e. a reference-to-limit ratio of 0.62. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "large mud pumps and offshore winch drums",
      "sugar mill and cement kiln pinion shafts",
      "hydraulic press and converter tilt drives"
    ],
    "failure_modes": [
      "false brinelling on idle paired sets exposed to machine vibration",
      "contact-angle shift and edge loading after uneven locknut torque tilts the set",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 72 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Assign interference to the rotating ring — roughly m6 on a 240 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "The steep 40° angle of 7248-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7248-BCBM?",
        "a": "7248 BCBM measures 240 mm bore × 440 mm OD × 72 mm width (9.449 × 17.323 × 2.835 in), mass about 49000 g. SKF 17000 ratings: C 449 kN, C0 670 kN, Pu 15.3 kN, reference speed 1,600 r/min (thermal) and limiting speed 2,600 r/min (mechanical)."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7248-BCBM?",
        "a": "With a rotating inner ring use roughly m6 on the 240 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7248-BCBM",
      "7248 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7052-BGM",
    "brand": "SKF",
    "manufacturer_designation": "7052 BGM",
    "series": "7000-series",
    "type": "angular_contact",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 332,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 11.8,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "weight_g": 30000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7052 BGM is SKF's 260 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 260×400×65 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 260×400×65 mm (10.236×15.748×2.559 in), 70.0 mm radial section height, C 332 kN, C0 510 kN, Pu 11.8 kN.reference speed 1,700 r/min (thermal) and limiting speed 1,700 r/min (mechanical), which coincide for this size, catalogue mass 30000 g. Selection figures for 7052 BGM: the static-to-dynamic ratio C0/C is 1.54, Pu 11.8 kN is about 4 % of C, and catalogue mass works out to roughly 115 g per millimetre of bore. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 1,700 r/min while thermal balance under catalogue load sets the 1,700 r/min reference; at dm ≈ 330.0 mm the corresponding dn is approximately 561k mm·r/min. Bore-to-OD planning: OD 400 over bore 260 is a 1.54× step for this size, and the 65 mm width gives a bore/width ratio of 4.00; use these ratios when housing space around the 260 mm shaft is the first constraint. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.",
    "applications": [
      "heavy industrial gearboxes",
      "large process pumps and compressors",
      "marine propulsion and deck machinery"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "G-clearance drift in a large-bore set whose stand-off rings settle under sustained heavy thrust",
      "brinelling from pressing the ring home through the balls or from static overload",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "DB pairs give the highest moment stiffness, DF pairs tolerate misalignment and thermal expansion better, DT shares heavy one-direction thrust; choose from the shaft thermal calculation rather than by habit.",
      "Assign interference to the rotating ring — roughly m6 on a 260 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Fillet radii must clear the chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Do not mix execution classes inside one set: a universally matchable BGM unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7052-BGM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7052 BGM as the single g brass execution; the other order numbers of the 7052 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7052-BGM?",
        "a": "7052 BGM measures 260 mm bore × 400 mm OD × 65 mm width (10.236 × 15.748 × 2.559 in), mass about 30000 g. SKF 17000 ratings: C 332 kN, C0 510 kN, Pu 11.8 kN, reference speed 1,700 r/min (thermal) and limiting speed 1,700 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BGM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set."
      },
      {
        "q": "Which fits should I use for 7052-BGM?",
        "a": "With a rotating inner ring use roughly m6 on the 260 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7052-BGM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 1,700 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7052",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7052-BGM",
      "7052 BGM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7056-BGM",
    "brand": "SKF",
    "manufacturer_designation": "7056 BGM",
    "series": "7000-series",
    "type": "angular_contact",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 338,
    "static_load_kN": 540,
    "fatigue_load_limit_kN": 12.2,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "weight_g": 30000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7056 BGM is SKF's 280 mm-bore single-row angular-contact ball bearing in the 7000 series, nominal 40° (B) contact angle, 280×420×65 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set. Envelope 280×420×65 mm (11.024×16.535×2.559 in), 70.0 mm radial section height, C 338 kN, C0 540 kN, Pu 12.2 kN.reference speed 1,600 r/min (thermal) and limiting speed 1,600 r/min (mechanical), which coincide for this size, catalogue mass 30000 g. Envelope economics: the 65 mm width over a 70.0 mm section yields 0.93 mm of ring width per section millimetre, and the bearing weighs 30000 g for 338 kN of dynamic capacity — about 89 g per rated kN. At the printed limiting speed of 1,600 r/min the mean pitch diameter dm ≈ 350.0 mm implies a dn value around 560k mm·r/min; the 1,600 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 420 over bore 280 is a 1.50× step for this size, and the 65 mm width gives a bore/width ratio of 4.31; use these ratios when housing space around the 280 mm shaft is the first constraint. Large-bore universal execution: the G suffix marks a universally matchable bearing delivered with controlled axial internal clearance rather than a factory preload, paired here with a machined brass cage (M); BGM is the large-section 70xx/72xx/73xx answer where field-set preload and brass-cage robustness are both required.",
    "applications": [
      "hydraulic press and converter tilt drives",
      "heavy dredge and excavator swing drives",
      "vertical mill separator drives"
    ],
    "failure_modes": [
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "false brinelling on idle paired sets exposed to machine vibration",
      "ball skidding when Fa/Fr stays below the 1,0 (40°) or 0,55 (25°) ratio and the contact ellipse is unloaded",
      "G-clearance drift in a large-bore set whose stand-off rings settle under sustained heavy thrust",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Greased positions should fill roughly 25–35 % of the free volume on a 7056-BGM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Greased positions should fill roughly 25–35 % of the free volume on a 7056-BGM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.",
      "Fillet radii must clear the chamfer so the 65 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BGM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "The steep 40° angle of 7056-BGM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7056 BGM as the single g brass execution; the other order numbers of the 7056 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7056-BGM?",
        "a": "7056 BGM measures 280 mm bore × 420 mm OD × 65 mm width (11.024 × 16.535 × 2.559 in), mass about 30000 g. SKF 17000 ratings: C 338 kN, C0 540 kN, Pu 12.2 kN, reference speed 1,600 r/min (thermal) and limiting speed 1,600 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BGM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. G marks a universally matchable bearing delivered with axial internal clearance (rather than factory preload), the starting point for field-set preload in a DB/DF set."
      },
      {
        "q": "Which fits should I use for 7056-BGM?",
        "a": "With a rotating inner ring use roughly m6 on the 280 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      },
      {
        "q": "Which grease and fill for 7056-BGM?",
        "a": "A premium mineral-oil grease with polyurea or lithium complex thickener and NLGI 2 consistency suits normal operating temperature; fill roughly 25–35 % of the free volume. Oil-air or oil-jet lubrication is the choice near the 1,600 r/min ceiling."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7056",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7056-BGM",
      "7056 BGM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7256-BM",
    "brand": "SKF",
    "manufacturer_designation": "7256 BM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 507,
    "static_load_kN": 830,
    "fatigue_load_limit_kN": 17.6,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "weight_g": 67500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7256 BM is SKF's 280 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 280×500×80 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BM is the non-optimized basic 40° execution with a machined brass cage; it predates the E geometry and is stocked for positions built around its specific figures.. Envelope 280×500×80 mm (11.024×19.685×3.15 in), 110.0 mm radial section height, C 507 kN, C0 830 kN, Pu 17.6 kN.reference speed 1,400 r/min (thermal) and limiting speed 1,400 r/min (mechanical), which coincide for this size, catalogue mass 67500 g. Mass and section check: 67500 g inside the 280×500×80 mm outline leaves a 110.0 mm radial section, and the 830 kN static rating is 1.64× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 830 kN against C 507 kN gives a 1.64 ratio, typical of a steep-angle axial-oriented design; Pu 17.6 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 1,400 r/min against a 1,400 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00. Non-optimized basic execution: BM is the earlier 40-degree design without the E internal upgrade, fitted with a machined brass ball-centred cage as a single (non-universal) bearing; quote it for housings and spacers designed around the legacy geometry.",
    "applications": [
      "sugar mill and cement kiln pinion shafts",
      "hydraulic press and converter tilt drives",
      "heavy dredge and excavator swing drives"
    ],
    "failure_modes": [
      "ball skidding when the induced axial load unloads the inactive bearing of a pair",
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "legacy-geometry cage smearing when the non-E basic bearing is run at speeds developed for the optimized E design",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Fillet radii must clear the chamfer so the 80 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.",
      "At 280 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "At 280 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "Do not mix execution classes inside one set: a universally matchable BM unit is ground for arbitrary pairing, a basic execution is not.",
      "The steep 40° angle of 7256-BM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 7256 BM as the single non e brass execution; the other order numbers of the 7256 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7256-BM?",
        "a": "7256 BM measures 280 mm bore × 500 mm OD × 80 mm width (11.024 × 19.685 × 3.15 in), mass about 67500 g. SKF 17000 ratings: C 507 kN, C0 830 kN, Pu 17.6 kN, reference speed 1,400 r/min (thermal) and limiting speed 1,400 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. The BM is the non-optimized basic 40° execution with a machined brass cage; it predates the E geometry and is stocked for positions built around its specific figures.."
      },
      {
        "q": "What is the difference between BEP, BECBP and BECBM?",
        "a": "All share the 40° optimized geometry: BEP is the basic PA66-caged single bearing, BECBP adds CB universal matching (ground faces, Normal clearance) with the same PA66 cage, and BECBM is the universally matchable version with a machined brass cage for higher speed and temperature."
      },
      {
        "q": "Which fits should I use for 7256-BM?",
        "a": "With a rotating inner ring use roughly m6 on the 280 mm shaft and H7 in the housing; give the stationary ring a slide fit for axial setting, and reverse the logic when the outer ring rotates."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7256-BM",
      "7256 BM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "7260-BCBM",
    "brand": "SKF",
    "manufacturer_designation": "7260 BCBM",
    "series": "7200-series",
    "type": "angular_contact",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 553,
    "static_load_kN": 930,
    "fatigue_load_limit_kN": 19.3,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "weight_g": 85000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "7260 BCBM is SKF's 300 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 300×540×85 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 300×540×85 mm (11.811×21.26×3.346 in), 120.0 mm radial section height, C 553 kN, C0 930 kN, Pu 19.3 kN.reference speed 1,300 r/min (thermal) and limiting speed 1,300 r/min (mechanical), which coincide for this size, catalogue mass 85000 g. Load balance: C0 930 kN against C 553 kN gives a 1.68 ratio, typical of a steep-angle axial-oriented design; Pu 19.3 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 300 mm bore: 553 kN C divided by the 120.0 mm radial section height gives 4.6 kN per section millimetre; the 85000 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 540 over bore 300 is a 1.80× step for this size, and the 85 mm width gives a bore/width ratio of 3.53; use these ratios when housing space around the 300 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.",
    "applications": [
      "large mud pumps and offshore winch drums",
      "sugar mill and cement kiln pinion shafts",
      "hydraulic press and converter tilt drives"
    ],
    "failure_modes": [
      "preload loss as a loosely clamped set runs slack and the balls smear the raceways",
      "thermal preload runaway in a back-to-back pair when inner-ring heat cannot expand away",
      "raceway smearing under minimum-axial-load starvation at light load and high speed",
      "set preload miscalculation because the non-E BCBM geometry differs in stiffness from E executions despite matching CB faces",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Assign interference to the rotating ring — roughly m6 on a 300 mm rotating shaft with an H7 housing — and let the stationary ring slide for axial setting; reverse the logic if the outer ring rotates.",
      "Preload the set against a calculated stand-off dimension — the ground faces of BCBM establish it, but locknut torque, sleeve crush and housing-face squareness each consume part of the allowance.",
      "Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.",
      "At 300 mm bore the m6 seat assumes a steel shaft and housing; aluminium housings grow faster with temperature, so re-check the outer-ring setting when the case is non-ferrous.",
      "The steep 40° angle of 7260-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.",
      "Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 7260-BCBM?",
        "a": "7260 BCBM measures 300 mm bore × 540 mm OD × 85 mm width (11.811 × 21.26 × 3.346 in), mass about 85000 g. SKF 17000 ratings: C 553 kN, C0 930 kN, Pu 19.3 kN, reference speed 1,300 r/min (thermal) and limiting speed 1,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the BCBM suffix mean?",
        "a": "40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Can one 7260-BCBM take thrust in both directions?",
        "a": "No. A single-row angular-contact bearing reacts axial load in one direction; reversing thrust needs a DB/DF matched pair (use a universally matchable CB/GA execution) or a double-row bearing. Under radial load the 40° angle induces an axial force that the arrangement must balance."
      },
      {
        "q": "What minimum axial load does 7260-BCBM need?",
        "a": "The balls must remain seated: SKF gives Fam ≈ A·(n·dm/1000)² and a load-ratio guideline of Fa/Fr ≥ 1 for the 40° B execution and ≥ 0,55 for the 25° AC execution. Preloaded pairs and spring loading are the usual ways of meeting it at light load and high speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "7260-BCBM",
      "7260 BCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3200-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3200 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 7.61,
    "static_load_kN": 4.3,
    "fatigue_load_limit_kN": 0.183,
    "reference_speed_rpm": 26000,
    "limiting_speed_rpm": 24000,
    "max_rpm": 24000,
    "weight_g": 51,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3200 ATN9 is SKF's 10 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 10×30×14 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 10×30×14 mm (0.394×1.181×0.551 in), 10.0 mm radial section height, C 7.61 kN, C0 4.3 kN, Pu 0.183 kN.reference speed 26,000 r/min (thermal) and limiting speed 24,000 r/min (mechanical), catalogue mass 51 g. The 0.183 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 7.61/4.3 kN ratings and 51 g mass this execution carries about 0.76 kN of C per millimetre of bore. Load balance: C0 4.3 kN against C 7.61 kN gives a 0.57 ratio, typical of a double-row bidirectional design; Pu 0.183 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 30 over bore 10 is a 3.00× step for this size, and the 14 mm width gives a bore/width ratio of 0.71; use these ratios when housing space around the 10 mm shaft is the first constraint.",
    "applications": [
      "small double-supported gear shafts needing two-direction location in one bearing",
      "compact pump and compressor drives",
      "textile machinery roller drives"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "A capped 3200-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "A capped 3200-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3200 ATN9 as the double atn9 execution; the other order numbers of the 3200 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3200-ATN9?",
        "a": "3200 ATN9 measures 10 mm bore × 30 mm OD × 14 mm width (0.394 × 1.181 × 0.551 in), mass about 51 g. SKF 17000 ratings: C 7.61 kN, C0 4.3 kN, Pu 0.183 kN, reference speed 26,000 r/min (thermal) and limiting speed 24,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Does the 3200 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly j5 on the 10 mm shaft and H7 in the 30 mm housing; check the wide ring seats square because the 14 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3200-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×30×14 mm envelope with catalogue ratings within 10 %; 3200 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3200-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×30×14 mm envelope with catalogue ratings within 10 %; 3200 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3200-ATN9",
      "3200 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3201-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3201 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 15.9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 10.1,
    "static_load_kN": 5.6,
    "fatigue_load_limit_kN": 0.24,
    "reference_speed_rpm": 24000,
    "limiting_speed_rpm": 22000,
    "max_rpm": 22000,
    "weight_g": 58,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3201 ATN9 is SKF's 12 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 12×32×15.9 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 12×32×15.9 mm (0.472×1.26×0.626 in), 10.0 mm radial section height, C 10.1 kN, C0 5.6 kN, Pu 0.24 kN.reference speed 24,000 r/min (thermal) and limiting speed 22,000 r/min (mechanical), catalogue mass 58 g. Selection figures for 3201 ATN9: the static-to-dynamic ratio C0/C is 0.55, Pu 0.24 kN is about 2 % of C, and catalogue mass works out to roughly 5 g per millimetre of bore. At the printed limiting speed of 22,000 r/min the mean pitch diameter dm ≈ 22.0 mm implies a dn value around 484k mm·r/min; the 24,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 32 over bore 12 is a 2.67× step for this size, and the 15.9 mm width gives a bore/width ratio of 0.75; use these ratios when housing space around the 12 mm shaft is the first constraint.",
    "applications": [
      "compact pump and compressor drives",
      "textile machinery roller drives",
      "small two-bearing-housing arrangements"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "A capped 3201-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Catalogue ratings of 10.1/5.6 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3201 ATN9 as the double atn9 execution; the other order numbers of the 3201 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3201-ATN9?",
        "a": "3201 ATN9 measures 12 mm bore × 32 mm OD × 15.9 mm width (0.472 × 1.26 × 0.626 in), mass about 58 g. SKF 17000 ratings: C 10.1 kN, C0 5.6 kN, Pu 0.24 kN, reference speed 24,000 r/min (thermal) and limiting speed 22,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly j5 on the 12 mm shaft and H7 in the 32 mm housing; check the wide ring seats square because the 15.9 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3201 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3201-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×32×15.9 mm envelope with catalogue ratings within 10 %; 3201 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3201-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×32×15.9 mm envelope with catalogue ratings within 10 %; 3201 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3201-ATN9",
      "3201 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3202-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3202 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 15.9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 11.2,
    "static_load_kN": 6.8,
    "fatigue_load_limit_kN": 0.285,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 66,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3202 ATN9 is SKF's 15 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 15×35×15.9 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 15×35×15.9 mm (0.591×1.378×0.626 in), 10.0 mm radial section height, C 11.2 kN, C0 6.8 kN, Pu 0.285 kN.reference speed 22,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical), catalogue mass 66 g. Load balance: C0 6.8 kN against C 11.2 kN gives a 0.61 ratio, typical of a double-row bidirectional design; Pu 0.285 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 15 mm bore: 11.2 kN C divided by the 10.0 mm radial section height gives 1.1 kN per section millimetre; the 66 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 22,000 r/min against a 18,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.22.",
    "applications": [
      "textile machinery roller drives",
      "small two-bearing-housing arrangements",
      "small double-supported gear shafts needing two-direction location in one bearing"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Compared with a single-row pair of the same bore, the double-row 3202 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Interference goes on the rotating ring (about j5 at 15 mm bore); the wide 15.9 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "A capped 3202-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Catalogue ratings of 11.2/6.8 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3202 ATN9 as the double atn9 execution; the other order numbers of the 3202 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3202-ATN9?",
        "a": "3202 ATN9 measures 15 mm bore × 35 mm OD × 15.9 mm width (0.591 × 1.378 × 0.626 in), mass about 66 g. SKF 17000 ratings: C 11.2 kN, C0 6.8 kN, Pu 0.285 kN, reference speed 22,000 r/min (thermal) and limiting speed 18,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Why choose the double-row 3202 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in ATN9?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3202-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×15.9 mm envelope with catalogue ratings within 10 %; 3202 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3202-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×15.9 mm envelope with catalogue ratings within 10 %; 3202 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3202-ATN9",
      "3202 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3302-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3302 ATN9",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 15.1,
    "static_load_kN": 9.3,
    "fatigue_load_limit_kN": 0.4,
    "reference_speed_rpm": 18000,
    "limiting_speed_rpm": 16000,
    "max_rpm": 16000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3302 ATN9 is SKF's 15 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 15×42×19 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 15×42×19 mm (0.591×1.654×0.748 in), 13.5 mm radial section height, C 15.1 kN, C0 9.3 kN, Pu 0.4 kN.reference speed 18,000 r/min (thermal) and limiting speed 16,000 r/min (mechanical), catalogue mass 130 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 16,000 r/min while thermal balance under catalogue load sets the 18,000 r/min reference; at dm ≈ 28.5 mm the corresponding dn is approximately 456k mm·r/min. Selection figures for 3302 ATN9: the static-to-dynamic ratio C0/C is 0.62, Pu 0.4 kN is about 3 % of C, and catalogue mass works out to roughly 9 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 18,000 r/min against a 16,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.13.",
    "applications": [
      "small two-bearing-housing arrangements",
      "small double-supported gear shafts needing two-direction location in one bearing",
      "compact pump and compressor drives"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Interference goes on the rotating ring (about j5 at 15 mm bore); the wide 19 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings of 15.1/9.3 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "A capped 3302-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "The double-row 3302 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3302 ATN9 as the double atn9 execution; the other order numbers of the 3302 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3302-ATN9?",
        "a": "3302 ATN9 measures 15 mm bore × 42 mm OD × 19 mm width (0.591 × 1.654 × 0.748 in), mass about 130 g. SKF 17000 ratings: C 15.1 kN, C0 9.3 kN, Pu 0.4 kN, reference speed 18,000 r/min (thermal) and limiting speed 16,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "What does the D mean in ATN9?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3302 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3302-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×19 mm envelope with catalogue ratings within 10 %; 3302 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3302-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×19 mm envelope with catalogue ratings within 10 %; 3302 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3302-ATN9",
      "3302 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3203-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3203 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 17.5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 8.8,
    "fatigue_load_limit_kN": 0.365,
    "reference_speed_rpm": 19000,
    "limiting_speed_rpm": 16000,
    "max_rpm": 16000,
    "weight_g": 96,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3203 ATN9 is SKF's 17 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 17×40×17.5 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 17×40×17.5 mm (0.669×1.575×0.689 in), 11.5 mm radial section height, C 14.3 kN, C0 8.8 kN, Pu 0.365 kN.reference speed 19,000 r/min (thermal) and limiting speed 16,000 r/min (mechanical), catalogue mass 96 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 16,000 r/min while thermal balance under catalogue load sets the 19,000 r/min reference; at dm ≈ 28.5 mm the corresponding dn is approximately 456k mm·r/min. Selection figures for 3203 ATN9: the static-to-dynamic ratio C0/C is 0.62, Pu 0.365 kN is about 3 % of C, and catalogue mass works out to roughly 6 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 19,000 r/min against a 16,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.19.",
    "applications": [
      "small two-bearing-housing arrangements",
      "small double-supported gear shafts needing two-direction location in one bearing",
      "compact pump and compressor drives"
    ],
    "failure_modes": [
      "tilted mounting that loads one double row more heavily than the other",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "The double-row 3203 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings of 14.3/8.8 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Compared with a single-row pair of the same bore, the double-row 3203 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3203 ATN9 as the double atn9 execution; the other order numbers of the 3203 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3203-ATN9?",
        "a": "3203 ATN9 measures 17 mm bore × 40 mm OD × 17.5 mm width (0.669 × 1.575 × 0.689 in), mass about 96 g. SKF 17000 ratings: C 14.3 kN, C0 8.8 kN, Pu 0.365 kN, reference speed 19,000 r/min (thermal) and limiting speed 16,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "What does the D mean in ATN9?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3203 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3203-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×17.5 mm envelope with catalogue ratings within 10 %; 3203 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3203-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×17.5 mm envelope with catalogue ratings within 10 %; 3203 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3203-ATN9",
      "3203 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3303-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3303 ATN9",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 22.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 21.6,
    "static_load_kN": 12.7,
    "fatigue_load_limit_kN": 0.54,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3303 ATN9 is SKF's 17 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 17×47×22.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 17×47×22.2 mm (0.669×1.85×0.874 in), 15.0 mm radial section height, C 21.6 kN, C0 12.7 kN, Pu 0.54 kN.reference speed 17,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical), catalogue mass 180 g. Load balance: C0 12.7 kN against C 21.6 kN gives a 0.59 ratio, typical of a double-row bidirectional design; Pu 0.54 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 17 mm bore: 21.6 kN C divided by the 15.0 mm radial section height gives 1.4 kN per section millimetre; the 180 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 17,000 r/min against a 14,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.21.",
    "applications": [
      "textile machinery roller drives",
      "small two-bearing-housing arrangements",
      "small double-supported gear shafts needing two-direction location in one bearing"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Catalogue ratings of 21.6/12.7 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Compared with a single-row pair of the same bore, the double-row 3303 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "A capped 3303-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3303 ATN9 as the double atn9 execution; the other order numbers of the 3303 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3303-ATN9?",
        "a": "3303 ATN9 measures 17 mm bore × 47 mm OD × 22.2 mm width (0.669 × 1.85 × 0.874 in), mass about 180 g. SKF 17000 ratings: C 21.6 kN, C0 12.7 kN, Pu 0.54 kN, reference speed 17,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Why choose the double-row 3303 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in ATN9?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3303-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×22.2 mm envelope with catalogue ratings within 10 %; 3303 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3303-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×22.2 mm envelope with catalogue ratings within 10 %; 3303 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3303-ATN9",
      "3303 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3204-A",
    "brand": "SKF",
    "manufacturer_designation": "3204 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 20.6,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 20.4,
    "static_load_kN": 12.9,
    "fatigue_load_limit_kN": 0.55,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3204 A is SKF's 20 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 20×47×20.6 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 20×47×20.6 mm (0.787×1.85×0.811 in), 13.5 mm radial section height, C 20.4 kN, C0 12.9 kN, Pu 0.55 kN.reference speed 16,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical), catalogue mass 160 g. Sizing arithmetic on the 20 mm bore: 20.4 kN C divided by the 13.5 mm radial section height gives 1.5 kN per section millimetre; the 160 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 12.9 kN against C 20.4 kN gives a 0.63 ratio, typical of a double-row bidirectional design; Pu 0.55 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 16,000 r/min against a 14,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.14.",
    "applications": [
      "small double-supported gear shafts needing two-direction location in one bearing",
      "compact pump and compressor drives",
      "textile machinery roller drives"
    ],
    "failure_modes": [
      "tilted mounting that loads one double row more heavily than the other",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Catalogue ratings of 20.4/12.9 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Interference goes on the rotating ring (about k5 at 20 mm bore); the wide 20.6 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "The double-row 3204 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3204 A as the double a steel execution; the other order numbers of the 3204 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3204-A?",
        "a": "3204 A measures 20 mm bore × 47 mm OD × 20.6 mm width (0.787 × 1.85 × 0.811 in), mass about 160 g. SKF 17000 ratings: C 20.4 kN, C0 12.9 kN, Pu 0.55 kN, reference speed 16,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Does the 3204 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 20 mm shaft and H7 in the 47 mm housing; check the wide ring seats square because the 20.6 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3204-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×20.6 mm envelope with catalogue ratings within 10 %; 3204 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3204-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×20.6 mm envelope with catalogue ratings within 10 %; 3204 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3204-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×20.6 mm envelope with catalogue ratings within 10 %; 3204 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3204-A",
      "3204 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3204-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3204 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 20.6,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 20.4,
    "static_load_kN": 12.9,
    "fatigue_load_limit_kN": 0.55,
    "reference_speed_rpm": 16000,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3204 ATN9 is SKF's 20 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 20×47×20.6 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 20×47×20.6 mm (0.787×1.85×0.811 in), 13.5 mm radial section height, C 20.4 kN, C0 12.9 kN, Pu 0.55 kN.reference speed 16,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical), catalogue mass 160 g. Sizing arithmetic on the 20 mm bore: 20.4 kN C divided by the 13.5 mm radial section height gives 1.5 kN per section millimetre; the 160 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 160 g inside the 20×47×20.6 mm outline leaves a 13.5 mm radial section, and the 12.9 kN static rating is 0.63× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 47 over bore 20 is a 2.35× step for this size, and the 20.6 mm width gives a bore/width ratio of 0.97; use these ratios when housing space around the 20 mm shaft is the first constraint.",
    "applications": [
      "small double-supported gear shafts needing two-direction location in one bearing",
      "compact pump and compressor drives",
      "textile machinery roller drives"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "A capped 3204-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings of 20.4/12.9 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3204 ATN9 as the double atn9 execution; the other order numbers of the 3204 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3204-ATN9?",
        "a": "3204 ATN9 measures 20 mm bore × 47 mm OD × 20.6 mm width (0.787 × 1.85 × 0.811 in), mass about 160 g. SKF 17000 ratings: C 20.4 kN, C0 12.9 kN, Pu 0.55 kN, reference speed 16,000 r/min (thermal) and limiting speed 14,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Does the 3204 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 20 mm shaft and H7 in the 47 mm housing; check the wide ring seats square because the 20.6 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3204-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×20.6 mm envelope with catalogue ratings within 10 %; 3204 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3204-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×20.6 mm envelope with catalogue ratings within 10 %; 3204 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3204-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×20.6 mm envelope with catalogue ratings within 10 %; 3204 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3204-ATN9",
      "3204 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3304-A",
    "brand": "SKF",
    "manufacturer_designation": "3304 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 22.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 23.6,
    "static_load_kN": 14.6,
    "fatigue_load_limit_kN": 0.62,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 220,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3304 A is SKF's 20 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 20×52×22.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 20×52×22.2 mm (0.787×2.047×0.874 in), 16.0 mm radial section height, C 23.6 kN, C0 14.6 kN, Pu 0.62 kN.reference speed 15,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical), catalogue mass 220 g. Envelope economics: the 22.2 mm width over a 16.0 mm section yields 1.39 mm of ring width per section millimetre, and the bearing weighs 220 g for 23.6 kN of dynamic capacity — about 9 g per rated kN. At the printed limiting speed of 13,000 r/min the mean pitch diameter dm ≈ 36.0 mm implies a dn value around 468k mm·r/min; the 15,000 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 15,000 r/min against a 13,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.15.",
    "applications": [
      "compact pump and compressor drives",
      "textile machinery roller drives",
      "small two-bearing-housing arrangements"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "The double-row 3304 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Interference goes on the rotating ring (about k5 at 20 mm bore); the wide 22.2 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3304 A as the double a steel execution; the other order numbers of the 3304 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3304-A?",
        "a": "3304 A measures 20 mm bore × 52 mm OD × 22.2 mm width (0.787 × 2.047 × 0.874 in), mass about 220 g. SKF 17000 ratings: C 23.6 kN, C0 14.6 kN, Pu 0.62 kN, reference speed 15,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 20 mm shaft and H7 in the 52 mm housing; check the wide ring seats square because the 22.2 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3304 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3304-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×22.2 mm envelope with catalogue ratings within 10 %; 3304 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3304-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×22.2 mm envelope with catalogue ratings within 10 %; 3304 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3304-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×22.2 mm envelope with catalogue ratings within 10 %; 3304 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3304-A",
      "3304 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3304-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3304 ATN9",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 22.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 23.6,
    "static_load_kN": 14.6,
    "fatigue_load_limit_kN": 0.62,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 220,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3304 ATN9 is SKF's 20 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 20×52×22.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 20×52×22.2 mm (0.787×2.047×0.874 in), 16.0 mm radial section height, C 23.6 kN, C0 14.6 kN, Pu 0.62 kN.reference speed 15,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical), catalogue mass 220 g. Envelope economics: the 22.2 mm width over a 16.0 mm section yields 1.39 mm of ring width per section millimetre, and the bearing weighs 220 g for 23.6 kN of dynamic capacity — about 9 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 13,000 r/min while thermal balance under catalogue load sets the 15,000 r/min reference; at dm ≈ 36.0 mm the corresponding dn is approximately 468k mm·r/min. Bore-to-OD planning: OD 52 over bore 20 is a 2.60× step for this size, and the 22.2 mm width gives a bore/width ratio of 0.90; use these ratios when housing space around the 20 mm shaft is the first constraint.",
    "applications": [
      "compact pump and compressor drives",
      "textile machinery roller drives",
      "small two-bearing-housing arrangements"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Interference goes on the rotating ring (about k5 at 20 mm bore); the wide 22.2 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Interference goes on the rotating ring (about k5 at 20 mm bore); the wide 22.2 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3304 ATN9 as the double atn9 execution; the other order numbers of the 3304 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3304-ATN9?",
        "a": "3304 ATN9 measures 20 mm bore × 52 mm OD × 22.2 mm width (0.787 × 2.047 × 0.874 in), mass about 220 g. SKF 17000 ratings: C 23.6 kN, C0 14.6 kN, Pu 0.62 kN, reference speed 15,000 r/min (thermal) and limiting speed 13,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 20 mm shaft and H7 in the 52 mm housing; check the wide ring seats square because the 22.2 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3304 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3304-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×22.2 mm envelope with catalogue ratings within 10 %; 3304 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3304-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×22.2 mm envelope with catalogue ratings within 10 %; 3304 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3304-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×22.2 mm envelope with catalogue ratings within 10 %; 3304 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3304-ATN9",
      "3304 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3205-A",
    "brand": "SKF",
    "manufacturer_designation": "3205 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 20.6,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.6,
    "static_load_kN": 14.3,
    "fatigue_load_limit_kN": 0.6,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3205 A is SKF's 25 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 25×52×20.6 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 25×52×20.6 mm (0.984×2.047×0.811 in), 13.5 mm radial section height, C 21.6 kN, C0 14.3 kN, Pu 0.6 kN.reference speed 14,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical), catalogue mass 180 g. Envelope economics: the 20.6 mm width over a 13.5 mm section yields 1.53 mm of ring width per section millimetre, and the bearing weighs 180 g for 21.6 kN of dynamic capacity — about 8 g per rated kN. At the printed limiting speed of 12,000 r/min the mean pitch diameter dm ≈ 38.5 mm implies a dn value around 462k mm·r/min; the 14,000 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 14,000 r/min against a 12,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.17.",
    "applications": [
      "elevator and hoist machinery",
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust"
    ],
    "failure_modes": [
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Compared with a single-row pair of the same bore, the double-row 3205 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Compared with a single-row pair of the same bore, the double-row 3205 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "The double-row 3205 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3205 A as the double a steel execution; the other order numbers of the 3205 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3205-A?",
        "a": "3205 A measures 25 mm bore × 52 mm OD × 20.6 mm width (0.984 × 2.047 × 0.811 in), mass about 180 g. SKF 17000 ratings: C 21.6 kN, C0 14.3 kN, Pu 0.6 kN, reference speed 14,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 25 mm shaft and H7 in the 52 mm housing; check the wide ring seats square because the 20.6 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3205 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3205-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×20.6 mm envelope with catalogue ratings within 10 %; 3205 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3205-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×20.6 mm envelope with catalogue ratings within 10 %; 3205 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3205-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×20.6 mm envelope with catalogue ratings within 10 %; 3205 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3205-A",
      "3205 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3205-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3205 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 20.6,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 21.6,
    "static_load_kN": 14.3,
    "fatigue_load_limit_kN": 0.6,
    "reference_speed_rpm": 14000,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3205 ATN9 is SKF's 25 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 25×52×20.6 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 25×52×20.6 mm (0.984×2.047×0.811 in), 13.5 mm radial section height, C 21.6 kN, C0 14.3 kN, Pu 0.6 kN.reference speed 14,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical), catalogue mass 180 g. Envelope economics: the 20.6 mm width over a 13.5 mm section yields 1.53 mm of ring width per section millimetre, and the bearing weighs 180 g for 21.6 kN of dynamic capacity — about 8 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 12,000 r/min while thermal balance under catalogue load sets the 14,000 r/min reference; at dm ≈ 38.5 mm the corresponding dn is approximately 462k mm·r/min. Bore-to-OD planning: OD 52 over bore 25 is a 2.08× step for this size, and the 20.6 mm width gives a bore/width ratio of 1.21; use these ratios when housing space around the 25 mm shaft is the first constraint.",
    "applications": [
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Compared with a single-row pair of the same bore, the double-row 3205 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Catalogue ratings of 21.6/14.3 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3205 ATN9 as the double atn9 execution; the other order numbers of the 3205 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3205-ATN9?",
        "a": "3205 ATN9 measures 25 mm bore × 52 mm OD × 20.6 mm width (0.984 × 2.047 × 0.811 in), mass about 180 g. SKF 17000 ratings: C 21.6 kN, C0 14.3 kN, Pu 0.6 kN, reference speed 14,000 r/min (thermal) and limiting speed 12,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 25 mm shaft and H7 in the 52 mm housing; check the wide ring seats square because the 20.6 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3205 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3205-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×20.6 mm envelope with catalogue ratings within 10 %; 3205 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3205-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×20.6 mm envelope with catalogue ratings within 10 %; 3205 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3205-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×20.6 mm envelope with catalogue ratings within 10 %; 3205 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3205-ATN9",
      "3205 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3305-A",
    "brand": "SKF",
    "manufacturer_designation": "3305 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 25.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32,
    "static_load_kN": 20.4,
    "fatigue_load_limit_kN": 0.865,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3305 A is SKF's 25 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 25×62×25.4 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 25×62×25.4 mm (0.984×2.441×1 in), 18.5 mm radial section height, C 32 kN, C0 20.4 kN, Pu 0.865 kN.reference speed 12,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), catalogue mass 350 g. Sizing arithmetic on the 25 mm bore: 32 kN C divided by the 18.5 mm radial section height gives 1.7 kN per section millimetre; the 350 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 20.4 kN against C 32 kN gives a 0.64 ratio, typical of a double-row bidirectional design; Pu 0.865 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: the reference speed is 12,000 r/min against a 11,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.09.",
    "applications": [
      "elevator and hoist machinery",
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust"
    ],
    "failure_modes": [
      "tilted mounting that loads one double row more heavily than the other",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Compared with a single-row pair of the same bore, the double-row 3305 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Compared with a single-row pair of the same bore, the double-row 3305 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Interference goes on the rotating ring (about k5 at 25 mm bore); the wide 25.4 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Interference goes on the rotating ring (about k5 at 25 mm bore); the wide 25.4 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3305 A as the double a steel execution; the other order numbers of the 3305 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3305-A?",
        "a": "3305 A measures 25 mm bore × 62 mm OD × 25.4 mm width (0.984 × 2.441 × 1 in), mass about 350 g. SKF 17000 ratings: C 32 kN, C0 20.4 kN, Pu 0.865 kN, reference speed 12,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Does the 3305 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 25 mm shaft and H7 in the 62 mm housing; check the wide ring seats square because the 25.4 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3305-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×25.4 mm envelope with catalogue ratings within 10 %; 3305 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3305-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×25.4 mm envelope with catalogue ratings within 10 %; 3305 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3305-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×25.4 mm envelope with catalogue ratings within 10 %; 3305 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3305-A",
      "3305 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3305-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3305 ATN9",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 25.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 32,
    "static_load_kN": 20.4,
    "fatigue_load_limit_kN": 0.865,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3305 ATN9 is SKF's 25 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 25×62×25.4 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 25×62×25.4 mm (0.984×2.441×1 in), 18.5 mm radial section height, C 32 kN, C0 20.4 kN, Pu 0.865 kN.reference speed 12,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical), catalogue mass 350 g. Sizing arithmetic on the 25 mm bore: 32 kN C divided by the 18.5 mm radial section height gives 1.7 kN per section millimetre; the 350 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 350 g inside the 25×62×25.4 mm outline leaves a 18.5 mm radial section, and the 20.4 kN static rating is 0.64× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 62 over bore 25 is a 2.48× step for this size, and the 25.4 mm width gives a bore/width ratio of 0.98; use these ratios when housing space around the 25 mm shaft is the first constraint.",
    "applications": [
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Compared with a single-row pair of the same bore, the double-row 3305 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "The double-row 3305 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3305 ATN9 as the double atn9 execution; the other order numbers of the 3305 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3305-ATN9?",
        "a": "3305 ATN9 measures 25 mm bore × 62 mm OD × 25.4 mm width (0.984 × 2.441 × 1 in), mass about 350 g. SKF 17000 ratings: C 32 kN, C0 20.4 kN, Pu 0.865 kN, reference speed 12,000 r/min (thermal) and limiting speed 11,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Does the 3305 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 25 mm shaft and H7 in the 62 mm housing; check the wide ring seats square because the 25.4 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3305-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×25.4 mm envelope with catalogue ratings within 10 %; 3305 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3305-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×25.4 mm envelope with catalogue ratings within 10 %; 3305 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3305-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×25.4 mm envelope with catalogue ratings within 10 %; 3305 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3305-ATN9",
      "3305 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3206-A",
    "brand": "SKF",
    "manufacturer_designation": "3206 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 23.8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 30,
    "static_load_kN": 20.4,
    "fatigue_load_limit_kN": 0.865,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3206 A is SKF's 30 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 30×62×23.8 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 30×62×23.8 mm (1.181×2.441×0.937 in), 16.0 mm radial section height, C 30 kN, C0 20.4 kN, Pu 0.865 kN.reference speed 11,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 290 g. Load balance: C0 20.4 kN against C 30 kN gives a 0.68 ratio, typical of a double-row bidirectional design; Pu 0.865 kN enters the SKF adjusted-life equation rather than the basic rating life. The 0.865 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 30/20.4 kN ratings and 290 g mass this execution carries about 1.00 kN of C per millimetre of bore. Bore-to-OD planning: OD 62 over bore 30 is a 2.07× step for this size, and the 23.8 mm width gives a bore/width ratio of 1.26; use these ratios when housing space around the 30 mm shaft is the first constraint.",
    "applications": [
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The double-row 3206 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "The double-row 3206 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Catalogue ratings of 30/20.4 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3206 A as the double a steel execution; the other order numbers of the 3206 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3206-A?",
        "a": "3206 A measures 30 mm bore × 62 mm OD × 23.8 mm width (1.181 × 2.441 × 0.937 in), mass about 290 g. SKF 17000 ratings: C 30 kN, C0 20.4 kN, Pu 0.865 kN, reference speed 11,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Why choose the double-row 3206 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3206-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×23.8 mm envelope with catalogue ratings within 10 %; 3206 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3206-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×23.8 mm envelope with catalogue ratings within 10 %; 3206 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3206-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×23.8 mm envelope with catalogue ratings within 10 %; 3206 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3206-A",
      "3206 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3206-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3206 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 23.8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 30,
    "static_load_kN": 20.4,
    "fatigue_load_limit_kN": 0.865,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3206 ATN9 is SKF's 30 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 30×62×23.8 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 30×62×23.8 mm (1.181×2.441×0.937 in), 16.0 mm radial section height, C 30 kN, C0 20.4 kN, Pu 0.865 kN.reference speed 11,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical), catalogue mass 290 g. Mass and section check: 290 g inside the 30×62×23.8 mm outline leaves a 16.0 mm radial section, and the 20.4 kN static rating is 0.68× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 0.865 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 30/20.4 kN ratings and 290 g mass this execution carries about 1.00 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 11,000 r/min against a 10,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.10.",
    "applications": [
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "A capped 3206-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Interference goes on the rotating ring (about k5 at 30 mm bore); the wide 23.8 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Compared with a single-row pair of the same bore, the double-row 3206 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3206 ATN9 as the double atn9 execution; the other order numbers of the 3206 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3206-ATN9?",
        "a": "3206 ATN9 measures 30 mm bore × 62 mm OD × 23.8 mm width (1.181 × 2.441 × 0.937 in), mass about 290 g. SKF 17000 ratings: C 30 kN, C0 20.4 kN, Pu 0.865 kN, reference speed 11,000 r/min (thermal) and limiting speed 10,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Why choose the double-row 3206 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in ATN9?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3206-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×23.8 mm envelope with catalogue ratings within 10 %; 3206 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3206-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×23.8 mm envelope with catalogue ratings within 10 %; 3206 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3206-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×23.8 mm envelope with catalogue ratings within 10 %; 3206 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3206-ATN9",
      "3206 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3306-A",
    "brand": "SKF",
    "manufacturer_designation": "3306 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 42.5,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 1.27,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 520,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3306 A is SKF's 30 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 30×72×30.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 30×72×30.2 mm (1.181×2.835×1.189 in), 21.0 mm radial section height, C 42.5 kN, C0 30 kN, Pu 1.27 kN.reference speed 10,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), catalogue mass 520 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 9,000 r/min while thermal balance under catalogue load sets the 10,000 r/min reference; at dm ≈ 51.0 mm the corresponding dn is approximately 459k mm·r/min. Envelope economics: the 30.2 mm width over a 21.0 mm section yields 1.44 mm of ring width per section millimetre, and the bearing weighs 520 g for 42.5 kN of dynamic capacity — about 12 g per rated kN. Bore-to-OD planning: OD 72 over bore 30 is a 2.40× step for this size, and the 30.2 mm width gives a bore/width ratio of 0.99; use these ratios when housing space around the 30 mm shaft is the first constraint.",
    "applications": [
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "The double-row 3306 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings of 42.5/30 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "The double-row 3306 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Compared with a single-row pair of the same bore, the double-row 3306 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3306 A as the double a steel execution; the other order numbers of the 3306 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3306-A?",
        "a": "3306 A measures 30 mm bore × 72 mm OD × 30.2 mm width (1.181 × 2.835 × 1.189 in), mass about 520 g. SKF 17000 ratings: C 42.5 kN, C0 30 kN, Pu 1.27 kN, reference speed 10,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3306 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3306-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×30.2 mm envelope with catalogue ratings within 10 %; 3306 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3306-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×30.2 mm envelope with catalogue ratings within 10 %; 3306 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3306-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×30.2 mm envelope with catalogue ratings within 10 %; 3306 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3306-A",
      "3306 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3306-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3306 ATN9",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 42.5,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 1.27,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 520,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3306 ATN9 is SKF's 30 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 30×72×30.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 30×72×30.2 mm (1.181×2.835×1.189 in), 21.0 mm radial section height, C 42.5 kN, C0 30 kN, Pu 1.27 kN.reference speed 10,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), catalogue mass 520 g. At the printed limiting speed of 9,000 r/min the mean pitch diameter dm ≈ 51.0 mm implies a dn value around 459k mm·r/min; the 10,000 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 30.2 mm width over a 21.0 mm section yields 1.44 mm of ring width per section millimetre, and the bearing weighs 520 g for 42.5 kN of dynamic capacity — about 12 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 10,000 r/min against a 9,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.11.",
    "applications": [
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "edge loading from shaft deflection or housing misalignment",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "The double-row 3306 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Interference goes on the rotating ring (about k5 at 30 mm bore); the wide 30.2 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings of 42.5/30 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3306 ATN9 as the double atn9 execution; the other order numbers of the 3306 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3306-ATN9?",
        "a": "3306 ATN9 measures 30 mm bore × 72 mm OD × 30.2 mm width (1.181 × 2.835 × 1.189 in), mass about 520 g. SKF 17000 ratings: C 42.5 kN, C0 30 kN, Pu 1.27 kN, reference speed 10,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "What does the D mean in ATN9?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3306 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3306-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×30.2 mm envelope with catalogue ratings within 10 %; 3306 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3306-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×30.2 mm envelope with catalogue ratings within 10 %; 3306 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3306-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×30.2 mm envelope with catalogue ratings within 10 %; 3306 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3306-ATN9",
      "3306 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3207-A",
    "brand": "SKF",
    "manufacturer_designation": "3207 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 40,
    "static_load_kN": 28,
    "fatigue_load_limit_kN": 1.18,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 440,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3207 A is SKF's 35 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 35×72×27 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 35×72×27 mm (1.378×2.835×1.063 in), 18.5 mm radial section height, C 40 kN, C0 28 kN, Pu 1.18 kN.reference speed 10,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), catalogue mass 440 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 9,000 r/min while thermal balance under catalogue load sets the 10,000 r/min reference; at dm ≈ 53.5 mm the corresponding dn is approximately 482k mm·r/min. Envelope economics: the 27 mm width over a 18.5 mm section yields 1.46 mm of ring width per section millimetre, and the bearing weighs 440 g for 40 kN of dynamic capacity — about 11 g per rated kN. Bore-to-OD planning: OD 72 over bore 35 is a 2.06× step for this size, and the 27 mm width gives a bore/width ratio of 1.30; use these ratios when housing space around the 35 mm shaft is the first constraint.",
    "applications": [
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "The double-row 3207 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "The double-row 3207 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "The double-row 3207 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings of 40/28 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3207 A as the double a steel execution; the other order numbers of the 3207 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3207-A?",
        "a": "3207 A measures 35 mm bore × 72 mm OD × 27 mm width (1.378 × 2.835 × 1.063 in), mass about 440 g. SKF 17000 ratings: C 40 kN, C0 28 kN, Pu 1.18 kN, reference speed 10,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3207 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3207-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3207-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3207-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3207-A",
      "3207 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3207-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3207 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 40,
    "static_load_kN": 28,
    "fatigue_load_limit_kN": 1.18,
    "reference_speed_rpm": 10000,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 440,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3207 ATN9 is SKF's 35 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 35×72×27 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 35×72×27 mm (1.378×2.835×1.063 in), 18.5 mm radial section height, C 40 kN, C0 28 kN, Pu 1.18 kN.reference speed 10,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical), catalogue mass 440 g. At the printed limiting speed of 9,000 r/min the mean pitch diameter dm ≈ 53.5 mm implies a dn value around 482k mm·r/min; the 10,000 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 27 mm width over a 18.5 mm section yields 1.46 mm of ring width per section millimetre, and the bearing weighs 440 g for 40 kN of dynamic capacity — about 11 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 10,000 r/min against a 9,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.11.",
    "applications": [
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "edge loading from shaft deflection or housing misalignment",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "A capped 3207-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings of 40/28 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Catalogue ratings of 40/28 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3207 ATN9 as the double atn9 execution; the other order numbers of the 3207 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3207-ATN9?",
        "a": "3207 ATN9 measures 35 mm bore × 72 mm OD × 27 mm width (1.378 × 2.835 × 1.063 in), mass about 440 g. SKF 17000 ratings: C 40 kN, C0 28 kN, Pu 1.18 kN, reference speed 10,000 r/min (thermal) and limiting speed 9,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "What does the D mean in ATN9?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3207 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3207-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3207-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3207-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3207-ATN9",
      "3207 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3307-A",
    "brand": "SKF",
    "manufacturer_designation": "3307 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 34.9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 52,
    "static_load_kN": 35.5,
    "fatigue_load_limit_kN": 1.5,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 740,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3307 A is SKF's 35 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 35×80×34.9 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 35×80×34.9 mm (1.378×3.15×1.374 in), 22.5 mm radial section height, C 52 kN, C0 35.5 kN, Pu 1.5 kN.reference speed 9,500 r/min (thermal) and limiting speed 8,500 r/min (mechanical), catalogue mass 740 g. Load balance: C0 35.5 kN against C 52 kN gives a 0.68 ratio, typical of a double-row bidirectional design; Pu 1.5 kN enters the SKF adjusted-life equation rather than the basic rating life. The 1.5 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 52/35.5 kN ratings and 740 g mass this execution carries about 1.49 kN of C per millimetre of bore. Bore-to-OD planning: OD 80 over bore 35 is a 2.29× step for this size, and the 34.9 mm width gives a bore/width ratio of 1.00; use these ratios when housing space around the 35 mm shaft is the first constraint.",
    "applications": [
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Catalogue ratings of 52/35.5 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Interference goes on the rotating ring (about k5 at 35 mm bore); the wide 34.9 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "The double-row 3307 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "The double-row 3307 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3307 A as the double a steel execution; the other order numbers of the 3307 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3307-A?",
        "a": "3307 A measures 35 mm bore × 80 mm OD × 34.9 mm width (1.378 × 3.15 × 1.374 in), mass about 740 g. SKF 17000 ratings: C 52 kN, C0 35.5 kN, Pu 1.5 kN, reference speed 9,500 r/min (thermal) and limiting speed 8,500 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Why choose the double-row 3307 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3307-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×34.9 mm envelope with catalogue ratings within 10 %; 3307 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3307-DJ1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×34.9 mm envelope, but catalogue C/C0 differ between executions (52/35.5 kN vs 52.7/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3307-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×34.9 mm envelope with catalogue ratings within 10 %; 3307 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3307-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×34.9 mm envelope with catalogue ratings within 10 %; 3307 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3307-A",
      "3307 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3307-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3307 ATN9",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 34.9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 52,
    "static_load_kN": 35.5,
    "fatigue_load_limit_kN": 1.5,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 740,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3307 ATN9 is SKF's 35 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 35×80×34.9 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 35×80×34.9 mm (1.378×3.15×1.374 in), 22.5 mm radial section height, C 52 kN, C0 35.5 kN, Pu 1.5 kN.reference speed 9,500 r/min (thermal) and limiting speed 8,500 r/min (mechanical), catalogue mass 740 g. Mass and section check: 740 g inside the 35×80×34.9 mm outline leaves a 22.5 mm radial section, and the 35.5 kN static rating is 0.68× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 1.5 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 52/35.5 kN ratings and 740 g mass this execution carries about 1.49 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 9,500 r/min against a 8,500 r/min limiting speed, i.e. a reference-to-limit ratio of 1.12.",
    "applications": [
      "elevator and hoist machinery",
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust"
    ],
    "failure_modes": [
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The double-row 3307 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "A capped 3307-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3307 ATN9 as the double atn9 execution; the other order numbers of the 3307 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3307-ATN9?",
        "a": "3307 ATN9 measures 35 mm bore × 80 mm OD × 34.9 mm width (1.378 × 3.15 × 1.374 in), mass about 740 g. SKF 17000 ratings: C 52 kN, C0 35.5 kN, Pu 1.5 kN, reference speed 9,500 r/min (thermal) and limiting speed 8,500 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Why choose the double-row 3307 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in ATN9?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3307-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×34.9 mm envelope with catalogue ratings within 10 %; 3307 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3307-DJ1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×34.9 mm envelope, but catalogue C/C0 differ between executions (52/35.5 kN vs 52.7/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3307-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×34.9 mm envelope with catalogue ratings within 10 %; 3307 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3307-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×34.9 mm envelope with catalogue ratings within 10 %; 3307 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3307-ATN9",
      "3307 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3307-DJ1",
    "brand": "SKF",
    "manufacturer_designation": "3307 DJ1",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 34.9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 52.7,
    "static_load_kN": 41.5,
    "fatigue_load_limit_kN": 1.76,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3307 DJ1 is SKF's 35 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 35×80×34.9 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. DJ1 combines the split inner ring with the J1 stamped steel ball-centred cage. Envelope 35×80×34.9 mm (1.378×3.15×1.374 in), 22.5 mm radial section height, C 52.7 kN, C0 41.5 kN, Pu 1.76 kN.reference speed 9,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical), catalogue mass 790 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 8,000 r/min while thermal balance under catalogue load sets the 9,000 r/min reference; at dm ≈ 57.5 mm the corresponding dn is approximately 460k mm·r/min. At the printed limiting speed of 8,000 r/min the mean pitch diameter dm ≈ 57.5 mm implies a dn value around 460k mm·r/min; the 9,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 80 over bore 35 is a 2.29× step for this size, and the 34.9 mm width gives a bore/width ratio of 1.00; use these ratios when housing space around the 35 mm shaft is the first constraint.",
    "applications": [
      "elevator and hoist machinery",
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "stamped J1 cage distortion if the split inner ring is assembled with the halves misaligned",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "A capped 3307-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "The double-row 3307 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings of 52.7/41.5 kN apply to the DJ1 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3307 DJ1 as the double d j1 execution; the other order numbers of the 3307 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3307-DJ1?",
        "a": "3307 DJ1 measures 35 mm bore × 80 mm OD × 34.9 mm width (1.378 × 3.15 × 1.374 in), mass about 790 g. SKF 17000 ratings: C 52.7 kN, C0 41.5 kN, Pu 1.76 kN, reference speed 9,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical)."
      },
      {
        "q": "What does the DJ1 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. DJ1 combines the split inner ring with the J1 stamped steel ball-centred cage."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 35 mm shaft and H7 in the 80 mm housing; check the wide ring seats square because the 34.9 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3307 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3307-A",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×34.9 mm envelope, but catalogue C/C0 differ between executions (52.7/41.5 kN vs 52/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3307-ATN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×34.9 mm envelope, but catalogue C/C0 differ between executions (52.7/41.5 kN vs 52/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3307-A-2Z",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×34.9 mm envelope, but catalogue C/C0 differ between executions (52.7/41.5 kN vs 52/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3307-A-2RS1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×34.9 mm envelope, but catalogue C/C0 differ between executions (52.7/41.5 kN vs 52/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3307-DJ1",
      "3307 DJ1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3208-A",
    "brand": "SKF",
    "manufacturer_designation": "3208 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 48,
    "static_load_kN": 36.5,
    "fatigue_load_limit_kN": 1.56,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3208 A is SKF's 40 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 40×80×30.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 40×80×30.2 mm (1.575×3.15×1.189 in), 20.0 mm radial section height, C 48 kN, C0 36.5 kN, Pu 1.56 kN.reference speed 9,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical), catalogue mass 570 g. The 1.56 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 48/36.5 kN ratings and 570 g mass this execution carries about 1.20 kN of C per millimetre of bore. Mass and section check: 570 g inside the 40×80×30.2 mm outline leaves a 20.0 mm radial section, and the 36.5 kN static rating is 0.76× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 9,000 r/min against a 8,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.13.",
    "applications": [
      "centrifugal pump shafts",
      "elevator and hoist machinery",
      "printing and converting machinery"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Interference goes on the rotating ring (about k5 at 40 mm bore); the wide 30.2 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings of 48/36.5 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Interference goes on the rotating ring (about k5 at 40 mm bore); the wide 30.2 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3208 A as the double a steel execution; the other order numbers of the 3208 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3208-A?",
        "a": "3208 A measures 40 mm bore × 80 mm OD × 30.2 mm width (1.575 × 3.15 × 1.189 in), mass about 570 g. SKF 17000 ratings: C 48 kN, C0 36.5 kN, Pu 1.56 kN, reference speed 9,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Does the 3208 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 40 mm shaft and H7 in the 80 mm housing; check the wide ring seats square because the 30.2 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3208-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3208-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3208-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3208-A",
      "3208 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3208-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3208 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 48,
    "static_load_kN": 36.5,
    "fatigue_load_limit_kN": 1.56,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3208 ATN9 is SKF's 40 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 40×80×30.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 40×80×30.2 mm (1.575×3.15×1.189 in), 20.0 mm radial section height, C 48 kN, C0 36.5 kN, Pu 1.56 kN.reference speed 9,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical), catalogue mass 570 g. The 1.56 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 48/36.5 kN ratings and 570 g mass this execution carries about 1.20 kN of C per millimetre of bore. Load balance: C0 36.5 kN against C 48 kN gives a 0.76 ratio, typical of a double-row bidirectional design; Pu 1.56 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 80 over bore 40 is a 2.00× step for this size, and the 30.2 mm width gives a bore/width ratio of 1.32; use these ratios when housing space around the 40 mm shaft is the first constraint.",
    "applications": [
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts",
      "elevator and hoist machinery"
    ],
    "failure_modes": [
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "A capped 3208-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "A capped 3208-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Catalogue ratings of 48/36.5 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3208 ATN9 as the double atn9 execution; the other order numbers of the 3208 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3208-ATN9?",
        "a": "3208 ATN9 measures 40 mm bore × 80 mm OD × 30.2 mm width (1.575 × 3.15 × 1.189 in), mass about 570 g. SKF 17000 ratings: C 48 kN, C0 36.5 kN, Pu 1.56 kN, reference speed 9,000 r/min (thermal) and limiting speed 8,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Does the 3208 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 40 mm shaft and H7 in the 80 mm housing; check the wide ring seats square because the 30.2 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3208-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3208-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3208-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3208-ATN9",
      "3208 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3308-DNRCBM",
    "brand": "SKF",
    "manufacturer_designation": "3308 DNRCBM",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 36.5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 49.4,
    "static_load_kN": 41.5,
    "fatigue_load_limit_kN": 1.76,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3308 DNRCBM is SKF's 40 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 40×90×36.5 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. NR adds a snap-ring groove in the outer ring supplied with the appropriate snap ring, and CB gives controlled axial clearance. DNRCBM combines the split inner ring, snap ring (NR), controlled CB clearance and a machined brass ball-centred M cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 40×90×36.5 mm (1.575×3.543×1.437 in), 25.0 mm radial section height, C 49.4 kN, C0 41.5 kN, Pu 1.76 kN.reference speed 8,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), catalogue mass 1200 g. Sizing arithmetic on the 40 mm bore: 49.4 kN C divided by the 25.0 mm radial section height gives 2.0 kN per section millimetre; the 1200 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 36.5 mm width over a 25.0 mm section yields 1.46 mm of ring width per section millimetre, and the bearing weighs 1200 g for 49.4 kN of dynamic capacity — about 24 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 8,000 r/min against a 7,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.14.",
    "applications": [
      "elevator and hoist machinery",
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "snap-ring groove distress or ring rotation if the NR snap ring is not seated fully in its groove",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The double-row 3308 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "The double-row 3308 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "A capped 3308-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Catalogue ratings of 49.4/41.5 kN apply to the DNRCBM execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3308 DNRCBM as the double d nr cb m execution; the other order numbers of the 3308 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3308-DNRCBM?",
        "a": "3308 DNRCBM measures 40 mm bore × 90 mm OD × 36.5 mm width (1.575 × 3.543 × 1.437 in), mass about 1200 g. SKF 17000 ratings: C 49.4 kN, C0 41.5 kN, Pu 1.76 kN, reference speed 8,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical)."
      },
      {
        "q": "What does the DNRCBM suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. NR adds a snap-ring groove in the outer ring supplied with the appropriate snap ring, and CB gives controlled axial clearance. DNRCBM combines the split inner ring, snap ring (NR), controlled CB clearance and a machined brass ball-centred M cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Why choose the double-row 3308 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in DNRCBM?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3308-A",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (49.4/41.5 kN vs 64/44 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-ATN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (49.4/41.5 kN vs 64/44 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (49.4/41.5 kN vs 68.9/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-DTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (49.4/41.5 kN vs 68.9/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A-2Z",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (49.4/41.5 kN vs 64/44 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A-2RS1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (49.4/41.5 kN vs 64/44 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3308-DNRCBM",
      "3308 DNRCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3308-A",
    "brand": "SKF",
    "manufacturer_designation": "3308 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 36.5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 64,
    "static_load_kN": 44,
    "fatigue_load_limit_kN": 1.86,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 930,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3308 A is SKF's 40 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 40×90×36.5 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 40×90×36.5 mm (1.575×3.543×1.437 in), 25.0 mm radial section height, C 64 kN, C0 44 kN, Pu 1.86 kN.reference speed 8,000 r/min (thermal) and limiting speed 7,500 r/min (mechanical), catalogue mass 930 g. Selection figures for 3308 A: the static-to-dynamic ratio C0/C is 0.69, Pu 1.86 kN is about 3 % of C, and catalogue mass works out to roughly 23 g per millimetre of bore. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 7,500 r/min while thermal balance under catalogue load sets the 8,000 r/min reference; at dm ≈ 65.0 mm the corresponding dn is approximately 488k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 8,000 r/min against a 7,500 r/min limiting speed, i.e. a reference-to-limit ratio of 1.07.",
    "applications": [
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts",
      "elevator and hoist machinery"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "A capped 3308-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Compared with a single-row pair of the same bore, the double-row 3308 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "A capped 3308-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3308 A as the double a steel execution; the other order numbers of the 3308 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3308-A?",
        "a": "3308 A measures 40 mm bore × 90 mm OD × 36.5 mm width (1.575 × 3.543 × 1.437 in), mass about 930 g. SKF 17000 ratings: C 64 kN, C0 44 kN, Pu 1.86 kN, reference speed 8,000 r/min (thermal) and limiting speed 7,500 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 40 mm shaft and H7 in the 90 mm housing; check the wide ring seats square because the 36.5 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3308 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3308-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (64/44 kN vs 49.4/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3308-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (64/44 kN vs 68.9/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-DTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (64/44 kN vs 68.9/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3308-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3308-A",
      "3308 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3308-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3308 ATN9",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 36.5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 64,
    "static_load_kN": 44,
    "fatigue_load_limit_kN": 1.86,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 930,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3308 ATN9 is SKF's 40 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 40×90×36.5 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 40×90×36.5 mm (1.575×3.543×1.437 in), 25.0 mm radial section height, C 64 kN, C0 44 kN, Pu 1.86 kN.reference speed 8,000 r/min (thermal) and limiting speed 7,500 r/min (mechanical), catalogue mass 930 g. Selection figures for 3308 ATN9: the static-to-dynamic ratio C0/C is 0.69, Pu 1.86 kN is about 3 % of C, and catalogue mass works out to roughly 23 g per millimetre of bore. At the printed limiting speed of 7,500 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 488k mm·r/min; the 8,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 90 over bore 40 is a 2.25× step for this size, and the 36.5 mm width gives a bore/width ratio of 1.10; use these ratios when housing space around the 40 mm shaft is the first constraint.",
    "applications": [
      "elevator and hoist machinery",
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference goes on the rotating ring (about k5 at 40 mm bore); the wide 36.5 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Interference goes on the rotating ring (about k5 at 40 mm bore); the wide 36.5 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "A capped 3308-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3308 ATN9 as the double atn9 execution; the other order numbers of the 3308 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3308-ATN9?",
        "a": "3308 ATN9 measures 40 mm bore × 90 mm OD × 36.5 mm width (1.575 × 3.543 × 1.437 in), mass about 930 g. SKF 17000 ratings: C 64 kN, C0 44 kN, Pu 1.86 kN, reference speed 8,000 r/min (thermal) and limiting speed 7,500 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 40 mm shaft and H7 in the 90 mm housing; check the wide ring seats square because the 36.5 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3308 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3308-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (64/44 kN vs 49.4/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3308-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (64/44 kN vs 68.9/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-DTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (64/44 kN vs 68.9/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3308-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3308-ATN9",
      "3308 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3308-DMA",
    "brand": "SKF",
    "manufacturer_designation": "3308 DMA",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 36.5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 68.9,
    "static_load_kN": 57,
    "fatigue_load_limit_kN": 2.45,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3308 DMA is SKF's 40 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 40×90×36.5 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. DMA pairs the split inner ring with a machined brass outer-ring-centred MA cage. Envelope 40×90×36.5 mm (1.575×3.543×1.437 in), 25.0 mm radial section height, C 68.9 kN, C0 57 kN, Pu 2.45 kN.reference speed 8,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), catalogue mass 1050 g. Mass and section check: 1050 g inside the 40×90×36.5 mm outline leaves a 25.0 mm radial section, and the 57 kN static rating is 0.83× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 7,000 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 455k mm·r/min; the 8,000 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 8,000 r/min against a 7,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.14. Split-ring execution note: DMA combines the two-piece inner ring (used to simplify mounting of the wide 33-series section) with a machined brass cage guided on the outer ring (MA rather than ball-centred M); outer-ring guidance steadies the cage in the heavy section at the cost of a different lubrication requirement at the guide land.",
    "applications": [
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "uneven loading of the split inner-ring halves if the MA cage guide land runs dry",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "The double-row 3308 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Compared with a single-row pair of the same bore, the double-row 3308 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "A capped 3308-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "A capped 3308-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3308 DMA as the double d ma execution; the other order numbers of the 3308 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3308-DMA?",
        "a": "3308 DMA measures 40 mm bore × 90 mm OD × 36.5 mm width (1.575 × 3.543 × 1.437 in), mass about 1050 g. SKF 17000 ratings: C 68.9 kN, C0 57 kN, Pu 2.45 kN, reference speed 8,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical)."
      },
      {
        "q": "What does the DMA suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. DMA pairs the split inner ring with a machined brass outer-ring-centred MA cage."
      },
      {
        "q": "Does the 3308 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 40 mm shaft and H7 in the 90 mm housing; check the wide ring seats square because the 36.5 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3308-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (68.9/57 kN vs 49.4/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (68.9/57 kN vs 64/44 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-ATN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (68.9/57 kN vs 64/44 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-DTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 DTN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3308-A-2Z",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (68.9/57 kN vs 64/44 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A-2RS1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (68.9/57 kN vs 64/44 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3308-DMA",
      "3308 DMA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3308-DTN9",
    "brand": "SKF",
    "manufacturer_designation": "3308 DTN9",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 36.5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 68.9,
    "static_load_kN": 57,
    "fatigue_load_limit_kN": 2.45,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3308 DTN9 is SKF's 40 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 40×90×36.5 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. DTN9 combines the split inner ring with the glass-fibre PA66 ball-centred TN9 cage. Envelope 40×90×36.5 mm (1.575×3.543×1.437 in), 25.0 mm radial section height, C 68.9 kN, C0 57 kN, Pu 2.45 kN.reference speed 8,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), catalogue mass 1050 g. Load balance: C0 57 kN against C 68.9 kN gives a 0.83 ratio, typical of a double-row bidirectional design; Pu 2.45 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 1050 g inside the 40×90×36.5 mm outline leaves a 25.0 mm radial section, and the 57 kN static rating is 0.83× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 8,000 r/min against a 7,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.14.",
    "applications": [
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "TN9 cage damage when the split-ring bearing is heated above the PA66 ceiling during mounting",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Compared with a single-row pair of the same bore, the double-row 3308 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Compared with a single-row pair of the same bore, the double-row 3308 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3308 DTN9 as the double d tn9 execution; the other order numbers of the 3308 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3308-DTN9?",
        "a": "3308 DTN9 measures 40 mm bore × 90 mm OD × 36.5 mm width (1.575 × 3.543 × 1.437 in), mass about 1050 g. SKF 17000 ratings: C 68.9 kN, C0 57 kN, Pu 2.45 kN, reference speed 8,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical)."
      },
      {
        "q": "What does the DTN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. DTN9 combines the split inner ring with the glass-fibre PA66 ball-centred TN9 cage."
      },
      {
        "q": "Does the 3308 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 40 mm shaft and H7 in the 90 mm housing; check the wide ring seats square because the 36.5 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3308-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (68.9/57 kN vs 49.4/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (68.9/57 kN vs 64/44 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-ATN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (68.9/57 kN vs 64/44 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-DMA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 DMA is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3308-A-2Z",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (68.9/57 kN vs 64/44 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A-2RS1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (68.9/57 kN vs 64/44 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3308-DTN9",
      "3308 DTN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3209-A",
    "brand": "SKF",
    "manufacturer_designation": "3209 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 51,
    "static_load_kN": 39,
    "fatigue_load_limit_kN": 1.63,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 630,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3209 A is SKF's 45 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 45×85×30.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 45×85×30.2 mm (1.772×3.346×1.189 in), 20.0 mm radial section height, C 51 kN, C0 39 kN, Pu 1.63 kN.reference speed 8,500 r/min (thermal) and limiting speed 7,500 r/min (mechanical), catalogue mass 630 g. Selection figures for 3209 A: the static-to-dynamic ratio C0/C is 0.76, Pu 1.63 kN is about 3 % of C, and catalogue mass works out to roughly 14 g per millimetre of bore. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 7,500 r/min while thermal balance under catalogue load sets the 8,500 r/min reference; at dm ≈ 65.0 mm the corresponding dn is approximately 488k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 8,500 r/min against a 7,500 r/min limiting speed, i.e. a reference-to-limit ratio of 1.13.",
    "applications": [
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "The double-row 3209 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "A capped 3209-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3209 A as the double a steel execution; the other order numbers of the 3209 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3209-A?",
        "a": "3209 A measures 45 mm bore × 85 mm OD × 30.2 mm width (1.772 × 3.346 × 1.189 in), mass about 630 g. SKF 17000 ratings: C 51 kN, C0 39 kN, Pu 1.63 kN, reference speed 8,500 r/min (thermal) and limiting speed 7,500 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 45 mm shaft and H7 in the 85 mm housing; check the wide ring seats square because the 30.2 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3209 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3209-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×30.2 mm envelope with catalogue ratings within 10 %; 3209 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3209-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×30.2 mm envelope with catalogue ratings within 10 %; 3209 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3209-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×30.2 mm envelope with catalogue ratings within 10 %; 3209 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3209-A",
      "3209 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3209-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3209 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 51,
    "static_load_kN": 39,
    "fatigue_load_limit_kN": 1.63,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 630,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3209 ATN9 is SKF's 45 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 45×85×30.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 45×85×30.2 mm (1.772×3.346×1.189 in), 20.0 mm radial section height, C 51 kN, C0 39 kN, Pu 1.63 kN.reference speed 8,500 r/min (thermal) and limiting speed 7,500 r/min (mechanical), catalogue mass 630 g. Selection figures for 3209 ATN9: the static-to-dynamic ratio C0/C is 0.76, Pu 1.63 kN is about 3 % of C, and catalogue mass works out to roughly 14 g per millimetre of bore. At the printed limiting speed of 7,500 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 488k mm·r/min; the 8,500 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 85 over bore 45 is a 1.89× step for this size, and the 30.2 mm width gives a bore/width ratio of 1.49; use these ratios when housing space around the 45 mm shaft is the first constraint.",
    "applications": [
      "centrifugal pump shafts",
      "elevator and hoist machinery",
      "printing and converting machinery"
    ],
    "failure_modes": [
      "tilted mounting that loads one double row more heavily than the other",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "The double-row 3209 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Catalogue ratings of 51/39 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "The double-row 3209 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3209 ATN9 as the double atn9 execution; the other order numbers of the 3209 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3209-ATN9?",
        "a": "3209 ATN9 measures 45 mm bore × 85 mm OD × 30.2 mm width (1.772 × 3.346 × 1.189 in), mass about 630 g. SKF 17000 ratings: C 51 kN, C0 39 kN, Pu 1.63 kN, reference speed 8,500 r/min (thermal) and limiting speed 7,500 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 45 mm shaft and H7 in the 85 mm housing; check the wide ring seats square because the 30.2 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3209 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3209-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×30.2 mm envelope with catalogue ratings within 10 %; 3209 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3209-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×30.2 mm envelope with catalogue ratings within 10 %; 3209 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3209-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×30.2 mm envelope with catalogue ratings within 10 %; 3209 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3209-ATN9",
      "3209 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3309-DNRCBM",
    "brand": "SKF",
    "manufacturer_designation": "3309 DNRCBM",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 39.7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 61.8,
    "static_load_kN": 52,
    "fatigue_load_limit_kN": 2.2,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3309 DNRCBM is SKF's 45 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 45×100×39.7 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. NR adds a snap-ring groove in the outer ring supplied with the appropriate snap ring, and CB gives controlled axial clearance. DNRCBM combines the split inner ring, snap ring (NR), controlled CB clearance and a machined brass ball-centred M cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 45×100×39.7 mm (1.772×3.937×1.563 in), 27.5 mm radial section height, C 61.8 kN, C0 52 kN, Pu 2.2 kN.reference speed 7,500 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 1500 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 6,300 r/min while thermal balance under catalogue load sets the 7,500 r/min reference; at dm ≈ 72.5 mm the corresponding dn is approximately 457k mm·r/min. At the printed limiting speed of 6,300 r/min the mean pitch diameter dm ≈ 72.5 mm implies a dn value around 457k mm·r/min; the 7,500 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 7,500 r/min against a 6,300 r/min limiting speed, i.e. a reference-to-limit ratio of 1.19.",
    "applications": [
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "snap-ring groove distress or ring rotation if the NR snap ring is not seated fully in its groove",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "The double-row 3309 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Interference goes on the rotating ring (about k5 at 45 mm bore); the wide 39.7 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Compared with a single-row pair of the same bore, the double-row 3309 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Controlled axial clearance is the heart of the design: CB denotes controlled Normal axial clearance between the two rows; check residual clearance after mounting and at operating temperature.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3309 DNRCBM as the double d nr cb m execution; the other order numbers of the 3309 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3309-DNRCBM?",
        "a": "3309 DNRCBM measures 45 mm bore × 100 mm OD × 39.7 mm width (1.772 × 3.937 × 1.563 in), mass about 1500 g. SKF 17000 ratings: C 61.8 kN, C0 52 kN, Pu 2.2 kN, reference speed 7,500 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the DNRCBM suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. NR adds a snap-ring groove in the outer ring supplied with the appropriate snap ring, and CB gives controlled axial clearance. DNRCBM combines the split inner ring, snap ring (NR), controlled CB clearance and a machined brass ball-centred M cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 45 mm shaft and H7 in the 100 mm housing; check the wide ring seats square because the 39.7 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3309 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3309-A",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (61.8/52 kN vs 75/53 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-ATN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (61.8/52 kN vs 75/53 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (61.8/52 kN vs 79.3/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-A-2Z",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (61.8/52 kN vs 75/53 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-A-2RS1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (61.8/52 kN vs 75/53 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3309-DNRCBM",
      "3309 DNRCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3309-A",
    "brand": "SKF",
    "manufacturer_designation": "3309 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 39.7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 75,
    "static_load_kN": 53,
    "fatigue_load_limit_kN": 2.24,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 1250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3309 A is SKF's 45 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 45×100×39.7 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 45×100×39.7 mm (1.772×3.937×1.563 in), 27.5 mm radial section height, C 75 kN, C0 53 kN, Pu 2.24 kN.reference speed 7,500 r/min (thermal) and limiting speed 6,700 r/min (mechanical), catalogue mass 1250 g. The 2.24 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 75/53 kN ratings and 1250 g mass this execution carries about 1.67 kN of C per millimetre of bore. Mass and section check: 1250 g inside the 45×100×39.7 mm outline leaves a 27.5 mm radial section, and the 53 kN static rating is 0.71× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 7,500 r/min against a 6,700 r/min limiting speed, i.e. a reference-to-limit ratio of 1.12.",
    "applications": [
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts",
      "elevator and hoist machinery"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Catalogue ratings of 75/53 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Interference goes on the rotating ring (about k5 at 45 mm bore); the wide 39.7 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Interference goes on the rotating ring (about k5 at 45 mm bore); the wide 39.7 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "The double-row 3309 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3309 A as the double a steel execution; the other order numbers of the 3309 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3309-A?",
        "a": "3309 A measures 45 mm bore × 100 mm OD × 39.7 mm width (1.772 × 3.937 × 1.563 in), mass about 1250 g. SKF 17000 ratings: C 75 kN, C0 53 kN, Pu 2.24 kN, reference speed 7,500 r/min (thermal) and limiting speed 6,700 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Does the 3309 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 45 mm shaft and H7 in the 100 mm housing; check the wide ring seats square because the 39.7 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3309-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (75/53 kN vs 61.8/52 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×39.7 mm envelope with catalogue ratings within 10 %; 3309 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3309-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (75/53 kN vs 79.3/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×39.7 mm envelope with catalogue ratings within 10 %; 3309 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3309-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×39.7 mm envelope with catalogue ratings within 10 %; 3309 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3309-A",
      "3309 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3309-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3309 ATN9",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 39.7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 75,
    "static_load_kN": 53,
    "fatigue_load_limit_kN": 2.24,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 1250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3309 ATN9 is SKF's 45 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 45×100×39.7 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 45×100×39.7 mm (1.772×3.937×1.563 in), 27.5 mm radial section height, C 75 kN, C0 53 kN, Pu 2.24 kN.reference speed 7,500 r/min (thermal) and limiting speed 6,700 r/min (mechanical), catalogue mass 1250 g. The 2.24 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 75/53 kN ratings and 1250 g mass this execution carries about 1.67 kN of C per millimetre of bore. Load balance: C0 53 kN against C 75 kN gives a 0.71 ratio, typical of a double-row bidirectional design; Pu 2.24 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 100 over bore 45 is a 2.22× step for this size, and the 39.7 mm width gives a bore/width ratio of 1.13; use these ratios when housing space around the 45 mm shaft is the first constraint.",
    "applications": [
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "The double-row 3309 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "A capped 3309-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Interference goes on the rotating ring (about k5 at 45 mm bore); the wide 39.7 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3309 ATN9 as the double atn9 execution; the other order numbers of the 3309 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3309-ATN9?",
        "a": "3309 ATN9 measures 45 mm bore × 100 mm OD × 39.7 mm width (1.772 × 3.937 × 1.563 in), mass about 1250 g. SKF 17000 ratings: C 75 kN, C0 53 kN, Pu 2.24 kN, reference speed 7,500 r/min (thermal) and limiting speed 6,700 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Does the 3309 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 45 mm shaft and H7 in the 100 mm housing; check the wide ring seats square because the 39.7 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3309-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (75/53 kN vs 61.8/52 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×39.7 mm envelope with catalogue ratings within 10 %; 3309 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3309-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (75/53 kN vs 79.3/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×39.7 mm envelope with catalogue ratings within 10 %; 3309 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3309-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×39.7 mm envelope with catalogue ratings within 10 %; 3309 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3309-ATN9",
      "3309 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3309-DMA",
    "brand": "SKF",
    "manufacturer_designation": "3309 DMA",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 39.7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 79.3,
    "static_load_kN": 69.5,
    "fatigue_load_limit_kN": 3,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 1650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3309 DMA is SKF's 45 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 45×100×39.7 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. DMA pairs the split inner ring with a machined brass outer-ring-centred MA cage. Envelope 45×100×39.7 mm (1.772×3.937×1.563 in), 27.5 mm radial section height, C 79.3 kN, C0 69.5 kN, Pu 3 kN.reference speed 7,500 r/min (thermal) and limiting speed 6,300 r/min (mechanical), catalogue mass 1650 g. Selection figures for 3309 DMA: the static-to-dynamic ratio C0/C is 0.88, Pu 3 kN is about 4 % of C, and catalogue mass works out to roughly 37 g per millimetre of bore. Envelope economics: the 39.7 mm width over a 27.5 mm section yields 1.44 mm of ring width per section millimetre, and the bearing weighs 1650 g for 79.3 kN of dynamic capacity — about 21 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 7,500 r/min against a 6,300 r/min limiting speed, i.e. a reference-to-limit ratio of 1.19. Split-ring execution note: DMA combines the two-piece inner ring (used to simplify mounting of the wide 33-series section) with a machined brass cage guided on the outer ring (MA rather than ball-centred M); outer-ring guidance steadies the cage in the heavy section at the cost of a different lubrication requirement at the guide land.",
    "applications": [
      "centrifugal pump shafts",
      "elevator and hoist machinery",
      "printing and converting machinery"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "uneven loading of the split inner-ring halves if the MA cage guide land runs dry",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Catalogue ratings of 79.3/69.5 kN apply to the DMA execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "The double-row 3309 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Interference goes on the rotating ring (about k5 at 45 mm bore); the wide 39.7 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Compared with a single-row pair of the same bore, the double-row 3309 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3309 DMA as the double d ma execution; the other order numbers of the 3309 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3309-DMA?",
        "a": "3309 DMA measures 45 mm bore × 100 mm OD × 39.7 mm width (1.772 × 3.937 × 1.563 in), mass about 1650 g. SKF 17000 ratings: C 79.3 kN, C0 69.5 kN, Pu 3 kN, reference speed 7,500 r/min (thermal) and limiting speed 6,300 r/min (mechanical)."
      },
      {
        "q": "What does the DMA suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. DMA pairs the split inner ring with a machined brass outer-ring-centred MA cage."
      },
      {
        "q": "What does the D mean in DMA?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3309 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3309-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (79.3/69.5 kN vs 61.8/52 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-A",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (79.3/69.5 kN vs 75/53 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-ATN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (79.3/69.5 kN vs 75/53 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-A-2Z",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (79.3/69.5 kN vs 75/53 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-A-2RS1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (79.3/69.5 kN vs 75/53 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3309-DMA",
      "3309 DMA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3210-A",
    "brand": "SKF",
    "manufacturer_designation": "3210 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 51,
    "static_load_kN": 42.5,
    "fatigue_load_limit_kN": 1.8,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3210 A is SKF's 50 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 50×90×30.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 50×90×30.2 mm (1.969×3.543×1.189 in), 20.0 mm radial section height, C 51 kN, C0 42.5 kN, Pu 1.8 kN.reference speed 8,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), catalogue mass 650 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 7,000 r/min while thermal balance under catalogue load sets the 8,000 r/min reference; at dm ≈ 70.0 mm the corresponding dn is approximately 490k mm·r/min. Envelope economics: the 30.2 mm width over a 20.0 mm section yields 1.51 mm of ring width per section millimetre, and the bearing weighs 650 g for 51 kN of dynamic capacity — about 13 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 8,000 r/min against a 7,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.14.",
    "applications": [
      "centrifugal pump shafts",
      "elevator and hoist machinery",
      "printing and converting machinery"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Interference goes on the rotating ring (about k5 at 50 mm bore); the wide 30.2 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "A capped 3210-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Interference goes on the rotating ring (about k5 at 50 mm bore); the wide 30.2 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Compared with a single-row pair of the same bore, the double-row 3210 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3210 A as the double a steel execution; the other order numbers of the 3210 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3210-A?",
        "a": "3210 A measures 50 mm bore × 90 mm OD × 30.2 mm width (1.969 × 3.543 × 1.189 in), mass about 650 g. SKF 17000 ratings: C 51 kN, C0 42.5 kN, Pu 1.8 kN, reference speed 8,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3210 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3210-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3210-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3210-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3210-A",
      "3210 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3210-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3210 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 51,
    "static_load_kN": 42.5,
    "fatigue_load_limit_kN": 1.8,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3210 ATN9 is SKF's 50 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 50×90×30.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 50×90×30.2 mm (1.969×3.543×1.189 in), 20.0 mm radial section height, C 51 kN, C0 42.5 kN, Pu 1.8 kN.reference speed 8,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical), catalogue mass 650 g. At the printed limiting speed of 7,000 r/min the mean pitch diameter dm ≈ 70.0 mm implies a dn value around 490k mm·r/min; the 8,000 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 30.2 mm width over a 20.0 mm section yields 1.51 mm of ring width per section millimetre, and the bearing weighs 650 g for 51 kN of dynamic capacity — about 13 g per rated kN. Bore-to-OD planning: OD 90 over bore 50 is a 1.80× step for this size, and the 30.2 mm width gives a bore/width ratio of 1.66; use these ratios when housing space around the 50 mm shaft is the first constraint.",
    "applications": [
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts",
      "elevator and hoist machinery"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Interference goes on the rotating ring (about k5 at 50 mm bore); the wide 30.2 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Compared with a single-row pair of the same bore, the double-row 3210 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Catalogue ratings of 51/42.5 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3210 ATN9 as the double atn9 execution; the other order numbers of the 3210 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3210-ATN9?",
        "a": "3210 ATN9 measures 50 mm bore × 90 mm OD × 30.2 mm width (1.969 × 3.543 × 1.189 in), mass about 650 g. SKF 17000 ratings: C 51 kN, C0 42.5 kN, Pu 1.8 kN, reference speed 8,000 r/min (thermal) and limiting speed 7,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "What does the D mean in ATN9?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3210 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3210-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3210-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3210-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3210-ATN9",
      "3210 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3310-DNRCBM",
    "brand": "SKF",
    "manufacturer_designation": "3310 DNRCBM",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 44.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 81.9,
    "static_load_kN": 69.5,
    "fatigue_load_limit_kN": 3,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 1950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3310 DNRCBM is SKF's 50 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 50×110×44.4 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. NR adds a snap-ring groove in the outer ring supplied with the appropriate snap ring, and CB gives controlled axial clearance. DNRCBM combines the split inner ring, snap ring (NR), controlled CB clearance and a machined brass ball-centred M cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 50×110×44.4 mm (1.969×4.331×1.748 in), 30.0 mm radial section height, C 81.9 kN, C0 69.5 kN, Pu 3 kN.reference speed 6,700 r/min (thermal) and limiting speed 5,600 r/min (mechanical), catalogue mass 1950 g. Selection figures for 3310 DNRCBM: the static-to-dynamic ratio C0/C is 0.85, Pu 3 kN is about 4 % of C, and catalogue mass works out to roughly 39 g per millimetre of bore. Envelope economics: the 44.4 mm width over a 30.0 mm section yields 1.48 mm of ring width per section millimetre, and the bearing weighs 1950 g for 81.9 kN of dynamic capacity — about 24 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 6,700 r/min against a 5,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.20.",
    "applications": [
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts",
      "elevator and hoist machinery"
    ],
    "failure_modes": [
      "tilted mounting that loads one double row more heavily than the other",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove distress or ring rotation if the NR snap ring is not seated fully in its groove",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Controlled axial clearance is the heart of the design: CB denotes controlled Normal axial clearance between the two rows; check residual clearance after mounting and at operating temperature.",
      "Interference goes on the rotating ring (about k5 at 50 mm bore); the wide 44.4 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3310 DNRCBM as the double d nr cb m execution; the other order numbers of the 3310 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3310-DNRCBM?",
        "a": "3310 DNRCBM measures 50 mm bore × 110 mm OD × 44.4 mm width (1.969 × 4.331 × 1.748 in), mass about 1950 g. SKF 17000 ratings: C 81.9 kN, C0 69.5 kN, Pu 3 kN, reference speed 6,700 r/min (thermal) and limiting speed 5,600 r/min (mechanical)."
      },
      {
        "q": "What does the DNRCBM suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. NR adds a snap-ring groove in the outer ring supplied with the appropriate snap ring, and CB gives controlled axial clearance. DNRCBM combines the split inner ring, snap ring (NR), controlled CB clearance and a machined brass ball-centred M cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "What does the D mean in DNRCBM?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3310 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3310-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×44.4 mm envelope, but catalogue C/C0 differ between executions (81.9/69.5 kN vs 93.6/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3310-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3310-DNRCBM",
      "3310 DNRCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3310-A",
    "brand": "SKF",
    "manufacturer_designation": "3310 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 44.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 90,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 2.75,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3310 A is SKF's 50 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 50×110×44.4 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 50×110×44.4 mm (1.969×4.331×1.748 in), 30.0 mm radial section height, C 90 kN, C0 64 kN, Pu 2.75 kN.reference speed 6,700 r/min (thermal) and limiting speed 6,000 r/min (mechanical), catalogue mass 1700 g. Mass and section check: 1700 g inside the 50×110×44.4 mm outline leaves a 30.0 mm radial section, and the 64 kN static rating is 0.71× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Sizing arithmetic on the 50 mm bore: 90 kN C divided by the 30.0 mm radial section height gives 3.0 kN per section millimetre; the 1700 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 6,700 r/min against a 6,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.12.",
    "applications": [
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set"
    ],
    "failure_modes": [
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Catalogue ratings of 90/64 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "The double-row 3310 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3310 A as the double a steel execution; the other order numbers of the 3310 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3310-A?",
        "a": "3310 A measures 50 mm bore × 110 mm OD × 44.4 mm width (1.969 × 4.331 × 1.748 in), mass about 1700 g. SKF 17000 ratings: C 90 kN, C0 64 kN, Pu 2.75 kN, reference speed 6,700 r/min (thermal) and limiting speed 6,000 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Why choose the double-row 3310 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3310-DNRCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 DNRCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×44.4 mm envelope, but catalogue C/C0 differ between executions (90/64 kN vs 93.6/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3310-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3310-A",
      "3310 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3310-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3310 ATN9",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 44.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 90,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 2.75,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3310 ATN9 is SKF's 50 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 50×110×44.4 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 50×110×44.4 mm (1.969×4.331×1.748 in), 30.0 mm radial section height, C 90 kN, C0 64 kN, Pu 2.75 kN.reference speed 6,700 r/min (thermal) and limiting speed 6,000 r/min (mechanical), catalogue mass 1700 g. Load balance: C0 64 kN against C 90 kN gives a 0.71 ratio, typical of a double-row bidirectional design; Pu 2.75 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 50 mm bore: 90 kN C divided by the 30.0 mm radial section height gives 3.0 kN per section millimetre; the 1700 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 110 over bore 50 is a 2.20× step for this size, and the 44.4 mm width gives a bore/width ratio of 1.13; use these ratios when housing space around the 50 mm shaft is the first constraint.",
    "applications": [
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set"
    ],
    "failure_modes": [
      "tilted mounting that loads one double row more heavily than the other",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The double-row 3310 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Compared with a single-row pair of the same bore, the double-row 3310 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Compared with a single-row pair of the same bore, the double-row 3310 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "A capped 3310-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3310 ATN9 as the double atn9 execution; the other order numbers of the 3310 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3310-ATN9?",
        "a": "3310 ATN9 measures 50 mm bore × 110 mm OD × 44.4 mm width (1.969 × 4.331 × 1.748 in), mass about 1700 g. SKF 17000 ratings: C 90 kN, C0 64 kN, Pu 2.75 kN, reference speed 6,700 r/min (thermal) and limiting speed 6,000 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Why choose the double-row 3310 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in ATN9?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3310-DNRCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 DNRCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×44.4 mm envelope, but catalogue C/C0 differ between executions (90/64 kN vs 93.6/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3310-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3310-ATN9",
      "3310 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3310-DMA",
    "brand": "SKF",
    "manufacturer_designation": "3310 DMA",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 44.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 93.6,
    "static_load_kN": 85,
    "fatigue_load_limit_kN": 3.6,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3310 DMA is SKF's 50 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 50×110×44.4 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. DMA pairs the split inner ring with a machined brass outer-ring-centred MA cage. Envelope 50×110×44.4 mm (1.969×4.331×1.748 in), 30.0 mm radial section height, C 93.6 kN, C0 85 kN, Pu 3.6 kN.reference speed 6,700 r/min (thermal) and limiting speed 5,600 r/min (mechanical), catalogue mass 2200 g. At the printed limiting speed of 5,600 r/min the mean pitch diameter dm ≈ 80.0 mm implies a dn value around 448k mm·r/min; the 6,700 r/min reference speed is the thermal-planning figure under catalogue load. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,600 r/min while thermal balance under catalogue load sets the 6,700 r/min reference; at dm ≈ 80.0 mm the corresponding dn is approximately 448k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 6,700 r/min against a 5,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.20. Split-ring execution note: DMA combines the two-piece inner ring (used to simplify mounting of the wide 33-series section) with a machined brass cage guided on the outer ring (MA rather than ball-centred M); outer-ring guidance steadies the cage in the heavy section at the cost of a different lubrication requirement at the guide land.",
    "applications": [
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts",
      "elevator and hoist machinery"
    ],
    "failure_modes": [
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "uneven loading of the split inner-ring halves if the MA cage guide land runs dry",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference goes on the rotating ring (about k5 at 50 mm bore); the wide 44.4 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "A capped 3310-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "A capped 3310-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3310 DMA as the double d ma execution; the other order numbers of the 3310 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3310-DMA?",
        "a": "3310 DMA measures 50 mm bore × 110 mm OD × 44.4 mm width (1.969 × 4.331 × 1.748 in), mass about 2200 g. SKF 17000 ratings: C 93.6 kN, C0 85 kN, Pu 3.6 kN, reference speed 6,700 r/min (thermal) and limiting speed 5,600 r/min (mechanical)."
      },
      {
        "q": "What does the DMA suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. DMA pairs the split inner ring with a machined brass outer-ring-centred MA cage."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 50 mm shaft and H7 in the 110 mm housing; check the wide ring seats square because the 44.4 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3310 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3310-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×44.4 mm envelope, but catalogue C/C0 differ between executions (93.6/85 kN vs 81.9/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3310-A",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×44.4 mm envelope, but catalogue C/C0 differ between executions (93.6/85 kN vs 90/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3310-ATN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×44.4 mm envelope, but catalogue C/C0 differ between executions (93.6/85 kN vs 90/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3310-A-2Z",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×44.4 mm envelope, but catalogue C/C0 differ between executions (93.6/85 kN vs 90/64 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3310-A-2RS1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×44.4 mm envelope, but catalogue C/C0 differ between executions (93.6/85 kN vs 90/64 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3310-DMA",
      "3310 DMA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3211-A",
    "brand": "SKF",
    "manufacturer_designation": "3211 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 33.3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 60,
    "static_load_kN": 47.5,
    "fatigue_load_limit_kN": 2,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 910,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3211 A is SKF's 55 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 55×100×33.3 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 55×100×33.3 mm (2.165×3.937×1.311 in), 22.5 mm radial section height, C 60 kN, C0 47.5 kN, Pu 2 kN.reference speed 6,300 r/min (thermal) and limiting speed 6,300 r/min (mechanical), which coincide for this size, catalogue mass 910 g. Load balance: C0 47.5 kN against C 60 kN gives a 0.79 ratio, typical of a double-row bidirectional design; Pu 2 kN enters the SKF adjusted-life equation rather than the basic rating life. The 2 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 60/47.5 kN ratings and 910 g mass this execution carries about 1.09 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 6,300 r/min against a 6,300 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00.",
    "applications": [
      "elevator and hoist machinery",
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Compared with a single-row pair of the same bore, the double-row 3211 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Catalogue ratings of 60/47.5 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Compared with a single-row pair of the same bore, the double-row 3211 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3211 A as the double a steel execution; the other order numbers of the 3211 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3211-A?",
        "a": "3211 A measures 55 mm bore × 100 mm OD × 33.3 mm width (2.165 × 3.937 × 1.311 in), mass about 910 g. SKF 17000 ratings: C 60 kN, C0 47.5 kN, Pu 2 kN, reference speed 6,300 r/min (thermal) and limiting speed 6,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Why choose the double-row 3211 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3211-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3211-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3211-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3211-A",
      "3211 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3211-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3211 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 33.3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 60,
    "static_load_kN": 47.5,
    "fatigue_load_limit_kN": 2,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 910,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3211 ATN9 is SKF's 55 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 55×100×33.3 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 55×100×33.3 mm (2.165×3.937×1.311 in), 22.5 mm radial section height, C 60 kN, C0 47.5 kN, Pu 2 kN.reference speed 6,300 r/min (thermal) and limiting speed 6,300 r/min (mechanical), which coincide for this size, catalogue mass 910 g. Mass and section check: 910 g inside the 55×100×33.3 mm outline leaves a 22.5 mm radial section, and the 47.5 kN static rating is 0.79× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 2 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 60/47.5 kN ratings and 910 g mass this execution carries about 1.09 kN of C per millimetre of bore. Bore-to-OD planning: OD 100 over bore 55 is a 1.82× step for this size, and the 33.3 mm width gives a bore/width ratio of 1.65; use these ratios when housing space around the 55 mm shaft is the first constraint.",
    "applications": [
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts",
      "elevator and hoist machinery"
    ],
    "failure_modes": [
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The double-row 3211 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Compared with a single-row pair of the same bore, the double-row 3211 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Compared with a single-row pair of the same bore, the double-row 3211 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "A capped 3211-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3211 ATN9 as the double atn9 execution; the other order numbers of the 3211 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3211-ATN9?",
        "a": "3211 ATN9 measures 55 mm bore × 100 mm OD × 33.3 mm width (2.165 × 3.937 × 1.311 in), mass about 910 g. SKF 17000 ratings: C 60 kN, C0 47.5 kN, Pu 2 kN, reference speed 6,300 r/min (thermal) and limiting speed 6,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Why choose the double-row 3211 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in ATN9?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3211-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3211-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3211-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3211-ATN9",
      "3211 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3311-DNRCBM",
    "brand": "SKF",
    "manufacturer_designation": "3311 DNRCBM",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 49.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 95.6,
    "static_load_kN": 83,
    "fatigue_load_limit_kN": 3.55,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 2550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3311 DNRCBM is SKF's 55 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 55×120×49.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. NR adds a snap-ring groove in the outer ring supplied with the appropriate snap ring, and CB gives controlled axial clearance. DNRCBM combines the split inner ring, snap ring (NR), controlled CB clearance and a machined brass ball-centred M cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 55×120×49.2 mm (2.165×4.724×1.937 in), 32.5 mm radial section height, C 95.6 kN, C0 83 kN, Pu 3.55 kN.reference speed 5,000 r/min (thermal) and limiting speed 5,300 r/min (mechanical), catalogue mass 2550 g. Load balance: C0 83 kN against C 95.6 kN gives a 0.87 ratio, typical of a double-row bidirectional design; Pu 3.55 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,300 r/min while thermal balance under catalogue load sets the 5,000 r/min reference; at dm ≈ 87.5 mm the corresponding dn is approximately 464k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 5,000 r/min against a 5,300 r/min limiting speed, i.e. a reference-to-limit ratio of 0.94.",
    "applications": [
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "snap-ring groove distress or ring rotation if the NR snap ring is not seated fully in its groove",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Catalogue ratings of 95.6/83 kN apply to the DNRCBM execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "The double-row 3311 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Compared with a single-row pair of the same bore, the double-row 3311 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3311 DNRCBM as the double d nr cb m execution; the other order numbers of the 3311 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3311-DNRCBM?",
        "a": "3311 DNRCBM measures 55 mm bore × 120 mm OD × 49.2 mm width (2.165 × 4.724 × 1.937 in), mass about 2550 g. SKF 17000 ratings: C 95.6 kN, C0 83 kN, Pu 3.55 kN, reference speed 5,000 r/min (thermal) and limiting speed 5,300 r/min (mechanical)."
      },
      {
        "q": "What does the DNRCBM suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. NR adds a snap-ring groove in the outer ring supplied with the appropriate snap ring, and CB gives controlled axial clearance. DNRCBM combines the split inner ring, snap ring (NR), controlled CB clearance and a machined brass ball-centred M cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Does the 3311 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 55 mm shaft and H7 in the 120 mm housing; check the wide ring seats square because the 49.2 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3311-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (95.6/83 kN vs 111/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-A",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (95.6/83 kN vs 112/81.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-ATN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (95.6/83 kN vs 112/81.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-A-2Z",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (95.6/83 kN vs 112/81.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-A-2RS1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (95.6/83 kN vs 112/81.5 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3311-DNRCBM",
      "3311 DNRCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3311-DMA",
    "brand": "SKF",
    "manufacturer_designation": "3311 DMA",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 49.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 111,
    "static_load_kN": 100,
    "fatigue_load_limit_kN": 4.3,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 2800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3311 DMA is SKF's 55 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 55×120×49.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. DMA pairs the split inner ring with a machined brass outer-ring-centred MA cage. Envelope 55×120×49.2 mm (2.165×4.724×1.937 in), 32.5 mm radial section height, C 111 kN, C0 100 kN, Pu 4.3 kN.reference speed 4,800 r/min (thermal) and limiting speed 5,000 r/min (mechanical), catalogue mass 2800 g. Sizing arithmetic on the 55 mm bore: 111 kN C divided by the 32.5 mm radial section height gives 3.4 kN per section millimetre; the 2800 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 49.2 mm width over a 32.5 mm section yields 1.51 mm of ring width per section millimetre, and the bearing weighs 2800 g for 111 kN of dynamic capacity — about 25 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 4,800 r/min against a 5,000 r/min limiting speed, i.e. a reference-to-limit ratio of 0.96. Split-ring execution note: DMA combines the two-piece inner ring (used to simplify mounting of the wide 33-series section) with a machined brass cage guided on the outer ring (MA rather than ball-centred M); outer-ring guidance steadies the cage in the heavy section at the cost of a different lubrication requirement at the guide land.",
    "applications": [
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts",
      "elevator and hoist machinery"
    ],
    "failure_modes": [
      "tilted mounting that loads one double row more heavily than the other",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "uneven loading of the split inner-ring halves if the MA cage guide land runs dry",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Compared with a single-row pair of the same bore, the double-row 3311 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "A capped 3311-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Compared with a single-row pair of the same bore, the double-row 3311 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3311 DMA as the double d ma execution; the other order numbers of the 3311 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3311-DMA?",
        "a": "3311 DMA measures 55 mm bore × 120 mm OD × 49.2 mm width (2.165 × 4.724 × 1.937 in), mass about 2800 g. SKF 17000 ratings: C 111 kN, C0 100 kN, Pu 4.3 kN, reference speed 4,800 r/min (thermal) and limiting speed 5,000 r/min (mechanical)."
      },
      {
        "q": "What does the DMA suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. DMA pairs the split inner ring with a machined brass outer-ring-centred MA cage."
      },
      {
        "q": "Why choose the double-row 3311 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in DMA?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3311-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (111/100 kN vs 95.6/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-A",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (111/100 kN vs 112/81.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-ATN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (111/100 kN vs 112/81.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-A-2Z",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (111/100 kN vs 112/81.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-A-2RS1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (111/100 kN vs 112/81.5 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3311-DMA",
      "3311 DMA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3311-A",
    "brand": "SKF",
    "manufacturer_designation": "3311 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 49.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 112,
    "static_load_kN": 81.5,
    "fatigue_load_limit_kN": 3.45,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3311 A is SKF's 55 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 55×120×49.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 55×120×49.2 mm (2.165×4.724×1.937 in), 32.5 mm radial section height, C 112 kN, C0 81.5 kN, Pu 3.45 kN.reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size, catalogue mass 2650 g. At the printed limiting speed of 5,300 r/min the mean pitch diameter dm ≈ 87.5 mm implies a dn value around 464k mm·r/min; the 5,300 r/min reference speed is the thermal-planning figure under catalogue load. Selection figures for 3311 A: the static-to-dynamic ratio C0/C is 0.73, Pu 3.45 kN is about 3 % of C, and catalogue mass works out to roughly 48 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 5,300 r/min against a 5,300 r/min limiting speed, i.e. a reference-to-limit ratio of 1.00.",
    "applications": [
      "printing and converting machinery",
      "gearbox input and output shafts with bidirectional thrust",
      "two-direction thrust positions without room for a paired single-row set"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "The double-row 3311 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings of 112/81.5 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Compared with a single-row pair of the same bore, the double-row 3311 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Compared with a single-row pair of the same bore, the double-row 3311 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3311 A as the double a steel execution; the other order numbers of the 3311 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3311-A?",
        "a": "3311 A measures 55 mm bore × 120 mm OD × 49.2 mm width (2.165 × 4.724 × 1.937 in), mass about 2650 g. SKF 17000 ratings: C 112 kN, C0 81.5 kN, Pu 3.45 kN, reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3311 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3311-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (112/81.5 kN vs 95.6/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (112/81.5 kN vs 111/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×49.2 mm envelope with catalogue ratings within 10 %; 3311 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3311-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×49.2 mm envelope with catalogue ratings within 10 %; 3311 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3311-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×49.2 mm envelope with catalogue ratings within 10 %; 3311 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3311-A",
      "3311 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3311-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3311 ATN9",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 49.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 112,
    "static_load_kN": 81.5,
    "fatigue_load_limit_kN": 3.45,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3311 ATN9 is SKF's 55 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 55×120×49.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 55×120×49.2 mm (2.165×4.724×1.937 in), 32.5 mm radial section height, C 112 kN, C0 81.5 kN, Pu 3.45 kN.reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size, catalogue mass 2650 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,300 r/min while thermal balance under catalogue load sets the 5,300 r/min reference; at dm ≈ 87.5 mm the corresponding dn is approximately 464k mm·r/min. Selection figures for 3311 ATN9: the static-to-dynamic ratio C0/C is 0.73, Pu 3.45 kN is about 3 % of C, and catalogue mass works out to roughly 48 g per millimetre of bore. Bore-to-OD planning: OD 120 over bore 55 is a 2.18× step for this size, and the 49.2 mm width gives a bore/width ratio of 1.12; use these ratios when housing space around the 55 mm shaft is the first constraint.",
    "applications": [
      "two-direction thrust positions without room for a paired single-row set",
      "centrifugal pump shafts",
      "elevator and hoist machinery"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Interference goes on the rotating ring (about k5 at 55 mm bore); the wide 49.2 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Compared with a single-row pair of the same bore, the double-row 3311 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "The double-row 3311 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings of 112/81.5 kN apply to the ATN9 execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3311 ATN9 as the double atn9 execution; the other order numbers of the 3311 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3311-ATN9?",
        "a": "3311 ATN9 measures 55 mm bore × 120 mm OD × 49.2 mm width (2.165 × 4.724 × 1.937 in), mass about 2650 g. SKF 17000 ratings: C 112 kN, C0 81.5 kN, Pu 3.45 kN, reference speed 5,300 r/min (thermal) and limiting speed 5,300 r/min (mechanical), which coincide for this size."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "What does the D mean in ATN9?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3311 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3311-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (112/81.5 kN vs 95.6/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (112/81.5 kN vs 111/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×49.2 mm envelope with catalogue ratings within 10 %; 3311 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3311-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×49.2 mm envelope with catalogue ratings within 10 %; 3311 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3311-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×49.2 mm envelope with catalogue ratings within 10 %; 3311 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3311-ATN9",
      "3311 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3212-A",
    "brand": "SKF",
    "manufacturer_designation": "3212 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 36.5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 58.5,
    "fatigue_load_limit_kN": 2.5,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3212 A is SKF's 60 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 60×110×36.5 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 60×110×36.5 mm (2.362×4.331×1.437 in), 25.0 mm radial section height, C 73.5 kN, C0 58.5 kN, Pu 2.5 kN.reference speed 6,300 r/min (thermal) and limiting speed 5,600 r/min (mechanical), catalogue mass 1200 g. Envelope economics: the 36.5 mm width over a 25.0 mm section yields 1.46 mm of ring width per section millimetre, and the bearing weighs 1200 g for 73.5 kN of dynamic capacity — about 16 g per rated kN. At the printed limiting speed of 5,600 r/min the mean pitch diameter dm ≈ 85.0 mm implies a dn value around 476k mm·r/min; the 6,300 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 110 over bore 60 is a 1.83× step for this size, and the 36.5 mm width gives a bore/width ratio of 1.64; use these ratios when housing space around the 60 mm shaft is the first constraint.",
    "applications": [
      "cement and mineral processing drives",
      "heavy gearbox shafts carrying reversing thrust",
      "process pump and agitator drives"
    ],
    "failure_modes": [
      "tilted mounting that loads one double row more heavily than the other",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Compared with a single-row pair of the same bore, the double-row 3212 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings of 73.5/58.5 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "The double-row 3212 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3212 A as the double a steel execution; the other order numbers of the 3212 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3212-A?",
        "a": "3212 A measures 60 mm bore × 110 mm OD × 36.5 mm width (2.362 × 4.331 × 1.437 in), mass about 1200 g. SKF 17000 ratings: C 73.5 kN, C0 58.5 kN, Pu 2.5 kN, reference speed 6,300 r/min (thermal) and limiting speed 5,600 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 60 mm shaft and H7 in the 110 mm housing; check the wide ring seats square because the 36.5 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3212 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3212-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3212-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3212-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3212-A",
      "3212 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3212-ATN9",
    "brand": "SKF",
    "manufacturer_designation": "3212 ATN9",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 36.5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 58.5,
    "fatigue_load_limit_kN": 2.5,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3212 ATN9 is SKF's 60 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 60×110×36.5 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling. Envelope 60×110×36.5 mm (2.362×4.331×1.437 in), 25.0 mm radial section height, C 73.5 kN, C0 58.5 kN, Pu 2.5 kN.reference speed 6,300 r/min (thermal) and limiting speed 5,600 r/min (mechanical), catalogue mass 1200 g. Envelope economics: the 36.5 mm width over a 25.0 mm section yields 1.46 mm of ring width per section millimetre, and the bearing weighs 1200 g for 73.5 kN of dynamic capacity — about 16 g per rated kN. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,600 r/min while thermal balance under catalogue load sets the 6,300 r/min reference; at dm ≈ 85.0 mm the corresponding dn is approximately 476k mm·r/min. Speed-ratio note for this exact unit: the reference speed is 6,300 r/min against a 5,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.13.",
    "applications": [
      "paper-machine dryer-section gearing",
      "cement and mineral processing drives",
      "heavy gearbox shafts carrying reversing thrust"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "TN9 cage embrittlement in a hot gearbox position beyond the 120 °C polymer ceiling",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "The double-row 3212 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Compared with a single-row pair of the same bore, the double-row 3212 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Interference goes on the rotating ring (about k5 at 60 mm bore); the wide 36.5 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3212 ATN9 as the double atn9 execution; the other order numbers of the 3212 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3212-ATN9?",
        "a": "3212 ATN9 measures 60 mm bore × 110 mm OD × 36.5 mm width (2.362 × 4.331 × 1.437 in), mass about 1200 g. SKF 17000 ratings: C 73.5 kN, C0 58.5 kN, Pu 2.5 kN, reference speed 6,300 r/min (thermal) and limiting speed 5,600 r/min (mechanical)."
      },
      {
        "q": "What does the ATN9 suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. glass-fibre reinforced PA66 cage, ball-centred (suffix TN9), with a 120 °C continuous-temperature ceiling."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 60 mm shaft and H7 in the 110 mm housing; check the wide ring seats square because the 36.5 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3212 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3212-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3212-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3212-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3212-ATN9",
      "3212 ATN9"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3312-A",
    "brand": "SKF",
    "manufacturer_designation": "3312 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 54,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 127,
    "static_load_kN": 95,
    "fatigue_load_limit_kN": 4.05,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 2800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3312 A is SKF's 60 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 60×130×54 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 60×130×54 mm (2.362×5.118×2.126 in), 35.0 mm radial section height, C 127 kN, C0 95 kN, Pu 4.05 kN.reference speed 5,600 r/min (thermal) and limiting speed 5,000 r/min (mechanical), catalogue mass 2800 g. The 4.05 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 127/95 kN ratings and 2800 g mass this execution carries about 2.12 kN of C per millimetre of bore. Mass and section check: 2800 g inside the 60×130×54 mm outline leaves a 35.0 mm radial section, and the 95 kN static rating is 0.75× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 130 over bore 60 is a 2.17× step for this size, and the 54 mm width gives a bore/width ratio of 1.11; use these ratios when housing space around the 60 mm shaft is the first constraint.",
    "applications": [
      "heavy gearbox shafts carrying reversing thrust",
      "process pump and agitator drives",
      "crane and winch gearboxes"
    ],
    "failure_modes": [
      "tilted mounting that loads one double row more heavily than the other",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "raceway staining from water in the lubricant during idle periods",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings of 127/95 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3312 A as the double a steel execution; the other order numbers of the 3312 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3312-A?",
        "a": "3312 A measures 60 mm bore × 130 mm OD × 54 mm width (2.362 × 5.118 × 2.126 in), mass about 2800 g. SKF 17000 ratings: C 127 kN, C0 95 kN, Pu 4.05 kN, reference speed 5,600 r/min (thermal) and limiting speed 5,000 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Does the 3312 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 60 mm shaft and H7 in the 130 mm housing; check the wide ring seats square because the 54 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3312-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×54 mm envelope with catalogue ratings within 10 %; 3312 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3312-A",
      "3312 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3213-A",
    "brand": "SKF",
    "manufacturer_designation": "3213 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 38.1,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 80.6,
    "static_load_kN": 73.5,
    "fatigue_load_limit_kN": 3.1,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3213 A is SKF's 65 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 65×120×38.1 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 65×120×38.1 mm (2.559×4.724×1.5 in), 27.5 mm radial section height, C 80.6 kN, C0 73.5 kN, Pu 3.1 kN.reference speed 5,600 r/min (thermal) and limiting speed 4,800 r/min (mechanical), catalogue mass 1750 g. Sizing arithmetic on the 65 mm bore: 80.6 kN C divided by the 27.5 mm radial section height gives 2.9 kN per section millimetre; the 1750 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 73.5 kN against C 80.6 kN gives a 0.91 ratio, typical of a double-row bidirectional design; Pu 3.1 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 120 over bore 65 is a 1.85× step for this size, and the 38.1 mm width gives a bore/width ratio of 1.71; use these ratios when housing space around the 65 mm shaft is the first constraint.",
    "applications": [
      "crane and winch gearboxes",
      "paper-machine dryer-section gearing",
      "cement and mineral processing drives"
    ],
    "failure_modes": [
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "fretting corrosion on a loose rotating shaft seat",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "The double-row 3213 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "The double-row 3213 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3213 A as the double a steel execution; the other order numbers of the 3213 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3213-A?",
        "a": "3213 A measures 65 mm bore × 120 mm OD × 38.1 mm width (2.559 × 4.724 × 1.5 in), mass about 1750 g. SKF 17000 ratings: C 80.6 kN, C0 73.5 kN, Pu 3.1 kN, reference speed 5,600 r/min (thermal) and limiting speed 4,800 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Does the 3213 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 65 mm shaft and H7 in the 120 mm housing; check the wide ring seats square because the 38.1 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3213-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×38.1 mm envelope with catalogue ratings within 10 %; 3213 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3213-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×38.1 mm envelope with catalogue ratings within 10 %; 3213 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3213-A",
      "3213 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3313-DNRCBM",
    "brand": "SKF",
    "manufacturer_designation": "3313 DNRCBM",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 58.7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 138,
    "static_load_kN": 122,
    "fatigue_load_limit_kN": 5.1,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 4000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3313 DNRCBM is SKF's 65 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 65×140×58.7 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. NR adds a snap-ring groove in the outer ring supplied with the appropriate snap ring, and CB gives controlled axial clearance. DNRCBM combines the split inner ring, snap ring (NR), controlled CB clearance and a machined brass ball-centred M cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 65×140×58.7 mm (2.559×5.512×2.311 in), 37.5 mm radial section height, C 138 kN, C0 122 kN, Pu 5.1 kN.reference speed 5,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 4000 g. Sizing arithmetic on the 65 mm bore: 138 kN C divided by the 37.5 mm radial section height gives 3.7 kN per section millimetre; the 4000 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 58.7 mm width over a 37.5 mm section yields 1.57 mm of ring width per section millimetre, and the bearing weighs 4000 g for 138 kN of dynamic capacity — about 29 g per rated kN. Bore-to-OD planning: OD 140 over bore 65 is a 2.15× step for this size, and the 58.7 mm width gives a bore/width ratio of 1.11; use these ratios when housing space around the 65 mm shaft is the first constraint.",
    "applications": [
      "cement and mineral processing drives",
      "heavy gearbox shafts carrying reversing thrust",
      "process pump and agitator drives"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "snap-ring groove distress or ring rotation if the NR snap ring is not seated fully in its groove",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Compared with a single-row pair of the same bore, the double-row 3313 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Controlled axial clearance is the heart of the design: CB denotes controlled Normal axial clearance between the two rows; check residual clearance after mounting and at operating temperature.",
      "The double-row 3313 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3313 DNRCBM as the double d nr cb m execution; the other order numbers of the 3313 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3313-DNRCBM?",
        "a": "3313 DNRCBM measures 65 mm bore × 140 mm OD × 58.7 mm width (2.559 × 5.512 × 2.311 in), mass about 4000 g. SKF 17000 ratings: C 138 kN, C0 122 kN, Pu 5.1 kN, reference speed 5,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical)."
      },
      {
        "q": "What does the DNRCBM suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. D marks a two-piece (split) inner ring that simplifies mounting of the heavy 33-series section. NR adds a snap-ring groove in the outer ring supplied with the appropriate snap ring, and CB gives controlled axial clearance. DNRCBM combines the split inner ring, snap ring (NR), controlled CB clearance and a machined brass ball-centred M cage. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding."
      },
      {
        "q": "Why choose the double-row 3313 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in DNRCBM?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3313-A",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×58.7 mm envelope, but catalogue C/C0 differ between executions (138/122 kN vs 146/110 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3313-A-2Z",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×58.7 mm envelope, but catalogue C/C0 differ between executions (138/122 kN vs 146/110 kN) — boundary dimensions match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3313-DNRCBM",
      "3313 DNRCBM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3313-A",
    "brand": "SKF",
    "manufacturer_designation": "3313 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 58.7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 146,
    "static_load_kN": 110,
    "fatigue_load_limit_kN": 4.55,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 4100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3313 A is SKF's 65 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 65×140×58.7 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 65×140×58.7 mm (2.559×5.512×2.311 in), 37.5 mm radial section height, C 146 kN, C0 110 kN, Pu 4.55 kN.reference speed 5,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 4100 g. Selection figures for 3313 A: the static-to-dynamic ratio C0/C is 0.75, Pu 4.55 kN is about 3 % of C, and catalogue mass works out to roughly 63 g per millimetre of bore. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,500 r/min while thermal balance under catalogue load sets the 5,300 r/min reference; at dm ≈ 102.5 mm the corresponding dn is approximately 461k mm·r/min. Bore-to-OD planning: OD 140 over bore 65 is a 2.15× step for this size, and the 58.7 mm width gives a bore/width ratio of 1.11; use these ratios when housing space around the 65 mm shaft is the first constraint.",
    "applications": [
      "heavy gearbox shafts carrying reversing thrust",
      "process pump and agitator drives",
      "crane and winch gearboxes"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "brinelling from pressing the ring home through the balls or from static overload",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Interference goes on the rotating ring (about k5 at 65 mm bore); the wide 58.7 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings of 146/110 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "A capped 3313-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3313 A as the double a steel execution; the other order numbers of the 3313 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3313-A?",
        "a": "3313 A measures 65 mm bore × 140 mm OD × 58.7 mm width (2.559 × 5.512 × 2.311 in), mass about 4100 g. SKF 17000 ratings: C 146 kN, C0 110 kN, Pu 4.55 kN, reference speed 5,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 65 mm shaft and H7 in the 140 mm housing; check the wide ring seats square because the 58.7 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3313 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3313-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×58.7 mm envelope, but catalogue C/C0 differ between executions (146/110 kN vs 138/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3313-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×58.7 mm envelope with catalogue ratings within 10 %; 3313 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3313-A",
      "3313 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3214-A",
    "brand": "SKF",
    "manufacturer_designation": "3214 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 39.7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 88.4,
    "static_load_kN": 80,
    "fatigue_load_limit_kN": 3.4,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3214 A is SKF's 70 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 70×125×39.7 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 70×125×39.7 mm (2.756×4.921×1.563 in), 27.5 mm radial section height, C 88.4 kN, C0 80 kN, Pu 3.4 kN.reference speed 5,600 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 1900 g. At the printed limiting speed of 4,500 r/min the mean pitch diameter dm ≈ 97.5 mm implies a dn value around 439k mm·r/min; the 5,600 r/min reference speed is the thermal-planning figure under catalogue load. Selection figures for 3214 A: the static-to-dynamic ratio C0/C is 0.90, Pu 3.4 kN is about 4 % of C, and catalogue mass works out to roughly 27 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 5,600 r/min against a 4,500 r/min limiting speed, i.e. a reference-to-limit ratio of 1.24.",
    "applications": [
      "crane and winch gearboxes",
      "paper-machine dryer-section gearing",
      "cement and mineral processing drives"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Catalogue ratings of 88.4/80 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Interference goes on the rotating ring (about k5 at 70 mm bore); the wide 39.7 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "The double-row 3214 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3214 A as the double a steel execution; the other order numbers of the 3214 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3214-A?",
        "a": "3214 A measures 70 mm bore × 125 mm OD × 39.7 mm width (2.756 × 4.921 × 1.563 in), mass about 1900 g. SKF 17000 ratings: C 88.4 kN, C0 80 kN, Pu 3.4 kN, reference speed 5,600 r/min (thermal) and limiting speed 4,500 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3214 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3214-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×39.7 mm envelope with catalogue ratings within 10 %; 3214 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3214-A",
      "3214 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3314-A",
    "brand": "SKF",
    "manufacturer_designation": "3314 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 63.5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 163,
    "static_load_kN": 125,
    "fatigue_load_limit_kN": 5,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 5050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3314 A is SKF's 70 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 70×150×63.5 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 70×150×63.5 mm (2.756×5.906×2.5 in), 40.0 mm radial section height, C 163 kN, C0 125 kN, Pu 5 kN.reference speed 5,000 r/min (thermal) and limiting speed 4,300 r/min (mechanical), catalogue mass 5050 g. Load balance: C0 125 kN against C 163 kN gives a 0.77 ratio, typical of a double-row bidirectional design; Pu 5 kN enters the SKF adjusted-life equation rather than the basic rating life. The 5 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 163/125 kN ratings and 5050 g mass this execution carries about 2.33 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 5,000 r/min against a 4,300 r/min limiting speed, i.e. a reference-to-limit ratio of 1.16.",
    "applications": [
      "heavy gearbox shafts carrying reversing thrust",
      "process pump and agitator drives",
      "crane and winch gearboxes"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Catalogue ratings of 163/125 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "A capped 3314-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Interference goes on the rotating ring (about k5 at 70 mm bore); the wide 63.5 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Interference goes on the rotating ring (about k5 at 70 mm bore); the wide 63.5 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3314 A as the double a steel execution; the other order numbers of the 3314 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3314-A?",
        "a": "3314 A measures 70 mm bore × 150 mm OD × 63.5 mm width (2.756 × 5.906 × 2.5 in), mass about 5050 g. SKF 17000 ratings: C 163 kN, C0 125 kN, Pu 5 kN, reference speed 5,000 r/min (thermal) and limiting speed 4,300 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Why choose the double-row 3314 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3314-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×63.5 mm envelope with catalogue ratings within 10 %; 3314 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3314-A",
      "3314 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3215-A",
    "brand": "SKF",
    "manufacturer_designation": "3215 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 41.3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 95.6,
    "static_load_kN": 88,
    "fatigue_load_limit_kN": 3.75,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3215 A is SKF's 75 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 75×130×41.3 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 75×130×41.3 mm (2.953×5.118×1.626 in), 27.5 mm radial section height, C 95.6 kN, C0 88 kN, Pu 3.75 kN.reference speed 5,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 2100 g. Mass and section check: 2100 g inside the 75×130×41.3 mm outline leaves a 27.5 mm radial section, and the 88 kN static rating is 0.92× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Sizing arithmetic on the 75 mm bore: 95.6 kN C divided by the 27.5 mm radial section height gives 3.5 kN per section millimetre; the 2100 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 5,300 r/min against a 4,500 r/min limiting speed, i.e. a reference-to-limit ratio of 1.18.",
    "applications": [
      "heavy gearbox shafts carrying reversing thrust",
      "process pump and agitator drives",
      "crane and winch gearboxes"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings of 95.6/88 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Interference goes on the rotating ring (about k5 at 75 mm bore); the wide 41.3 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3215 A as the double a steel execution; the other order numbers of the 3215 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3215-A?",
        "a": "3215 A measures 75 mm bore × 130 mm OD × 41.3 mm width (2.953 × 5.118 × 1.626 in), mass about 2100 g. SKF 17000 ratings: C 95.6 kN, C0 88 kN, Pu 3.75 kN, reference speed 5,300 r/min (thermal) and limiting speed 4,500 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Why choose the double-row 3215 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3215-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×41.3 mm envelope with catalogue ratings within 10 %; 3215 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3215-A",
      "3215 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3315-A",
    "brand": "SKF",
    "manufacturer_designation": "3315 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 68.3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 176,
    "static_load_kN": 140,
    "fatigue_load_limit_kN": 5.5,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 5550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3315 A is SKF's 75 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 75×160×68.3 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 75×160×68.3 mm (2.953×6.299×2.689 in), 42.5 mm radial section height, C 176 kN, C0 140 kN, Pu 5.5 kN.reference speed 4,500 r/min (thermal) and limiting speed 4,000 r/min (mechanical), catalogue mass 5550 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,000 r/min while thermal balance under catalogue load sets the 4,500 r/min reference; at dm ≈ 117.5 mm the corresponding dn is approximately 470k mm·r/min. Envelope economics: the 68.3 mm width over a 42.5 mm section yields 1.61 mm of ring width per section millimetre, and the bearing weighs 5550 g for 176 kN of dynamic capacity — about 32 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 4,500 r/min against a 4,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.13.",
    "applications": [
      "process pump and agitator drives",
      "crane and winch gearboxes",
      "paper-machine dryer-section gearing"
    ],
    "failure_modes": [
      "tilted mounting that loads one double row more heavily than the other",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "A capped 3315-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Interference goes on the rotating ring (about k5 at 75 mm bore); the wide 68.3 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "A capped 3315-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Compared with a single-row pair of the same bore, the double-row 3315 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3315 A as the double a steel execution; the other order numbers of the 3315 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3315-A?",
        "a": "3315 A measures 75 mm bore × 160 mm OD × 68.3 mm width (2.953 × 6.299 × 2.689 in), mass about 5550 g. SKF 17000 ratings: C 176 kN, C0 140 kN, Pu 5.5 kN, reference speed 4,500 r/min (thermal) and limiting speed 4,000 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3315 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3315-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×68.3 mm envelope with catalogue ratings within 10 %; 3315 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3315-A",
      "3315 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3216-A",
    "brand": "SKF",
    "manufacturer_designation": "3216 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 44.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 106,
    "static_load_kN": 95,
    "fatigue_load_limit_kN": 3.9,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3216 A is SKF's 80 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 80×140×44.4 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 80×140×44.4 mm (3.15×5.512×1.748 in), 30.0 mm radial section height, C 106 kN, C0 95 kN, Pu 3.9 kN.reference speed 5,000 r/min (thermal) and limiting speed 4,300 r/min (mechanical), catalogue mass 2650 g. Selection figures for 3216 A: the static-to-dynamic ratio C0/C is 0.90, Pu 3.9 kN is about 4 % of C, and catalogue mass works out to roughly 33 g per millimetre of bore. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,300 r/min while thermal balance under catalogue load sets the 5,000 r/min reference; at dm ≈ 110.0 mm the corresponding dn is approximately 473k mm·r/min. Bore-to-OD planning: OD 140 over bore 80 is a 1.75× step for this size, and the 44.4 mm width gives a bore/width ratio of 1.80; use these ratios when housing space around the 80 mm shaft is the first constraint.",
    "applications": [
      "heavy gearbox shafts carrying reversing thrust",
      "process pump and agitator drives",
      "crane and winch gearboxes"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "brinelling from pressing the ring home through the balls or from static overload",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Catalogue ratings of 106/95 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Compared with a single-row pair of the same bore, the double-row 3216 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Interference goes on the rotating ring (about k5 at 80 mm bore); the wide 44.4 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3216 A as the double a steel execution; the other order numbers of the 3216 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3216-A?",
        "a": "3216 A measures 80 mm bore × 140 mm OD × 44.4 mm width (3.15 × 5.512 × 1.748 in), mass about 2650 g. SKF 17000 ratings: C 106 kN, C0 95 kN, Pu 3.9 kN, reference speed 5,000 r/min (thermal) and limiting speed 4,300 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 80 mm shaft and H7 in the 140 mm housing; check the wide ring seats square because the 44.4 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3216 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3216",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3216-A",
      "3216 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3316-A",
    "brand": "SKF",
    "manufacturer_designation": "3316 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 68.3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 193,
    "static_load_kN": 156,
    "fatigue_load_limit_kN": 6,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 6800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3316 A is SKF's 80 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 80×170×68.3 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 80×170×68.3 mm (3.15×6.693×2.689 in), 45.0 mm radial section height, C 193 kN, C0 156 kN, Pu 6 kN.reference speed 4,300 r/min (thermal) and limiting speed 3,800 r/min (mechanical), catalogue mass 6800 g. Sizing arithmetic on the 80 mm bore: 193 kN C divided by the 45.0 mm radial section height gives 4.3 kN per section millimetre; the 6800 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 156 kN against C 193 kN gives a 0.81 ratio, typical of a double-row bidirectional design; Pu 6 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 170 over bore 80 is a 2.13× step for this size, and the 68.3 mm width gives a bore/width ratio of 1.17; use these ratios when housing space around the 80 mm shaft is the first constraint.",
    "applications": [
      "cement and mineral processing drives",
      "heavy gearbox shafts carrying reversing thrust",
      "process pump and agitator drives"
    ],
    "failure_modes": [
      "tilted mounting that loads one double row more heavily than the other",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "fretting corrosion on a loose rotating shaft seat",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "A capped 3316-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Interference goes on the rotating ring (about k5 at 80 mm bore); the wide 68.3 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Interference goes on the rotating ring (about k5 at 80 mm bore); the wide 68.3 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Compared with a single-row pair of the same bore, the double-row 3316 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3316 A as the double a steel execution; the other order numbers of the 3316 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3316-A?",
        "a": "3316 A measures 80 mm bore × 170 mm OD × 68.3 mm width (3.15 × 6.693 × 2.689 in), mass about 6800 g. SKF 17000 ratings: C 193 kN, C0 156 kN, Pu 6 kN, reference speed 4,300 r/min (thermal) and limiting speed 3,800 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Does the 3316 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 80 mm shaft and H7 in the 170 mm housing; check the wide ring seats square because the 68.3 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3316",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3316-A",
      "3316 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3217-A",
    "brand": "SKF",
    "manufacturer_designation": "3217 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 49.2,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 124,
    "static_load_kN": 110,
    "fatigue_load_limit_kN": 4.4,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 3400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3217 A is SKF's 85 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 85×150×49.2 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 85×150×49.2 mm (3.346×5.906×1.937 in), 32.5 mm radial section height, C 124 kN, C0 110 kN, Pu 4.4 kN.reference speed 4,500 r/min (thermal) and limiting speed 3,800 r/min (mechanical), catalogue mass 3400 g. The 4.4 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 124/110 kN ratings and 3400 g mass this execution carries about 1.46 kN of C per millimetre of bore. Mass and section check: 3400 g inside the 85×150×49.2 mm outline leaves a 32.5 mm radial section, and the 110 kN static rating is 0.89× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 150 over bore 85 is a 1.76× step for this size, and the 49.2 mm width gives a bore/width ratio of 1.73; use these ratios when housing space around the 85 mm shaft is the first constraint.",
    "applications": [
      "paper-machine dryer-section gearing",
      "cement and mineral processing drives",
      "heavy gearbox shafts carrying reversing thrust"
    ],
    "failure_modes": [
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "tilted mounting that loads one double row more heavily than the other",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "raceway staining from water in the lubricant during idle periods",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "A capped 3217-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "A capped 3217-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "A capped 3217-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "The double-row 3217 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3217 A as the double a steel execution; the other order numbers of the 3217 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3217-A?",
        "a": "3217 A measures 85 mm bore × 150 mm OD × 49.2 mm width (3.346 × 5.906 × 1.937 in), mass about 3400 g. SKF 17000 ratings: C 124 kN, C0 110 kN, Pu 4.4 kN, reference speed 4,500 r/min (thermal) and limiting speed 3,800 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Does the 3217 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 85 mm shaft and H7 in the 150 mm housing; check the wide ring seats square because the 49.2 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3217",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3217-A",
      "3217 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3317-A",
    "brand": "SKF",
    "manufacturer_designation": "3317 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 208,
    "static_load_kN": 176,
    "fatigue_load_limit_kN": 6.55,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 8300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3317 A is SKF's 85 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 85×180×73 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 85×180×73 mm (3.346×7.087×2.874 in), 47.5 mm radial section height, C 208 kN, C0 176 kN, Pu 6.55 kN.reference speed 4,000 r/min (thermal) and limiting speed 3,600 r/min (mechanical), catalogue mass 8300 g. Envelope economics: the 73 mm width over a 47.5 mm section yields 1.54 mm of ring width per section millimetre, and the bearing weighs 8300 g for 208 kN of dynamic capacity — about 40 g per rated kN. At the printed limiting speed of 3,600 r/min the mean pitch diameter dm ≈ 132.5 mm implies a dn value around 477k mm·r/min; the 4,000 r/min reference speed is the thermal-planning figure under catalogue load. Bore-to-OD planning: OD 180 over bore 85 is a 2.12× step for this size, and the 73 mm width gives a bore/width ratio of 1.16; use these ratios when housing space around the 85 mm shaft is the first constraint.",
    "applications": [
      "heavy gearbox shafts carrying reversing thrust",
      "process pump and agitator drives",
      "crane and winch gearboxes"
    ],
    "failure_modes": [
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "The double-row 3317 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Catalogue ratings of 208/176 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "The double-row 3317 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3317 A as the double a steel execution; the other order numbers of the 3317 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3317-A?",
        "a": "3317 A measures 85 mm bore × 180 mm OD × 73 mm width (3.346 × 7.087 × 2.874 in), mass about 8300 g. SKF 17000 ratings: C 208 kN, C0 176 kN, Pu 6.55 kN, reference speed 4,000 r/min (thermal) and limiting speed 3,600 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly k5 on the 85 mm shaft and H7 in the 180 mm housing; check the wide ring seats square because the 73 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3317 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3317",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3317-A",
      "3317 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3218-A",
    "brand": "SKF",
    "manufacturer_designation": "3218 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 52.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 130,
    "static_load_kN": 120,
    "fatigue_load_limit_kN": 4.55,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 4150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3218 A is SKF's 90 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 90×160×52.4 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 90×160×52.4 mm (3.543×6.299×2.063 in), 35.0 mm radial section height, C 130 kN, C0 120 kN, Pu 4.55 kN.reference speed 4,300 r/min (thermal) and limiting speed 3,600 r/min (mechanical), catalogue mass 4150 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 3,600 r/min while thermal balance under catalogue load sets the 4,300 r/min reference; at dm ≈ 125.0 mm the corresponding dn is approximately 450k mm·r/min. Envelope economics: the 52.4 mm width over a 35.0 mm section yields 1.50 mm of ring width per section millimetre, and the bearing weighs 4150 g for 130 kN of dynamic capacity — about 32 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 4,300 r/min against a 3,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.19.",
    "applications": [
      "process pump and agitator drives",
      "crane and winch gearboxes",
      "paper-machine dryer-section gearing"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "A capped 3218-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "A capped 3218-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "A capped 3218-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "The double-row 3218 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3218 A as the double a steel execution; the other order numbers of the 3218 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3218-A?",
        "a": "3218 A measures 90 mm bore × 160 mm OD × 52.4 mm width (3.543 × 6.299 × 2.063 in), mass about 4150 g. SKF 17000 ratings: C 130 kN, C0 120 kN, Pu 4.55 kN, reference speed 4,300 r/min (thermal) and limiting speed 3,600 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3218 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3218",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3218-A",
      "3218 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3318-A",
    "brand": "SKF",
    "manufacturer_designation": "3318 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 208,
    "static_load_kN": 180,
    "fatigue_load_limit_kN": 6.4,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 9250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3318 A is SKF's 90 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 90×190×73 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 90×190×73 mm (3.543×7.48×2.874 in), 50.0 mm radial section height, C 208 kN, C0 180 kN, Pu 6.4 kN.reference speed 3,800 r/min (thermal) and limiting speed 3,400 r/min (mechanical), catalogue mass 9250 g. Mass and section check: 9250 g inside the 90×190×73 mm outline leaves a 50.0 mm radial section, and the 180 kN static rating is 0.87× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Sizing arithmetic on the 90 mm bore: 208 kN C divided by the 50.0 mm radial section height gives 4.2 kN per section millimetre; the 9250 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: the reference speed is 3,800 r/min against a 3,400 r/min limiting speed, i.e. a reference-to-limit ratio of 1.12.",
    "applications": [
      "process pump and agitator drives",
      "crane and winch gearboxes",
      "paper-machine dryer-section gearing"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Catalogue ratings of 208/180 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3318 A as the double a steel execution; the other order numbers of the 3318 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3318-A?",
        "a": "3318 A measures 90 mm bore × 190 mm OD × 73 mm width (3.543 × 7.48 × 2.874 in), mass about 9250 g. SKF 17000 ratings: C 208 kN, C0 180 kN, Pu 6.4 kN, reference speed 3,800 r/min (thermal) and limiting speed 3,400 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Why choose the double-row 3318 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3318",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3318-A",
      "3318 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3219-A",
    "brand": "SKF",
    "manufacturer_designation": "3219 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 55.6,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 159,
    "static_load_kN": 146,
    "fatigue_load_limit_kN": 5.4,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "weight_g": 5000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3219 A is SKF's 95 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 95×170×55.6 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 95×170×55.6 mm (3.74×6.693×2.189 in), 37.5 mm radial section height, C 159 kN, C0 146 kN, Pu 5.4 kN.reference speed 4,000 r/min (thermal) and limiting speed 3,400 r/min (mechanical), catalogue mass 5000 g. Load balance: C0 146 kN against C 159 kN gives a 0.92 ratio, typical of a double-row bidirectional design; Pu 5.4 kN enters the SKF adjusted-life equation rather than the basic rating life. The 5.4 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 159/146 kN ratings and 5000 g mass this execution carries about 1.67 kN of C per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 4,000 r/min against a 3,400 r/min limiting speed, i.e. a reference-to-limit ratio of 1.18.",
    "applications": [
      "process pump and agitator drives",
      "crane and winch gearboxes",
      "paper-machine dryer-section gearing"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "A capped 3219-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Compared with a single-row pair of the same bore, the double-row 3219 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Catalogue ratings of 159/146 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3219 A as the double a steel execution; the other order numbers of the 3219 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3219-A?",
        "a": "3219 A measures 95 mm bore × 170 mm OD × 55.6 mm width (3.74 × 6.693 × 2.189 in), mass about 5000 g. SKF 17000 ratings: C 159 kN, C0 146 kN, Pu 5.4 kN, reference speed 4,000 r/min (thermal) and limiting speed 3,400 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Why choose the double-row 3219 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3219",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3219-A",
      "3219 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3319-A",
    "brand": "SKF",
    "manufacturer_designation": "3319 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 77.8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 240,
    "static_load_kN": 216,
    "fatigue_load_limit_kN": 7.5,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3319 A is SKF's 95 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 95×200×77.8 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 95×200×77.8 mm (3.74×7.874×3.063 in), 52.5 mm radial section height, C 240 kN, C0 216 kN, Pu 7.5 kN.reference speed 3,600 r/min (thermal) and limiting speed 3,200 r/min (mechanical), catalogue mass 11000 g. At the printed limiting speed of 3,200 r/min the mean pitch diameter dm ≈ 147.5 mm implies a dn value around 472k mm·r/min; the 3,600 r/min reference speed is the thermal-planning figure under catalogue load. Selection figures for 3319 A: the static-to-dynamic ratio C0/C is 0.90, Pu 7.5 kN is about 3 % of C, and catalogue mass works out to roughly 116 g per millimetre of bore. Speed-ratio note for this exact unit: the reference speed is 3,600 r/min against a 3,200 r/min limiting speed, i.e. a reference-to-limit ratio of 1.13.",
    "applications": [
      "heavy gearbox shafts carrying reversing thrust",
      "process pump and agitator drives",
      "crane and winch gearboxes"
    ],
    "failure_modes": [
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Interference goes on the rotating ring (about k5 at 95 mm bore); the wide 77.8 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings of 240/216 kN apply to the A execution; the D and DNRCBM two-piece-ring executions carry their own figures on their own pages.",
      "A capped 3319-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "The double-row 3319 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3319 A as the double a steel execution; the other order numbers of the 3319 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3319-A?",
        "a": "3319 A measures 95 mm bore × 200 mm OD × 77.8 mm width (3.74 × 7.874 × 3.063 in), mass about 11000 g. SKF 17000 ratings: C 240 kN, C0 216 kN, Pu 7.5 kN, reference speed 3,600 r/min (thermal) and limiting speed 3,200 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3319 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3319",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3319-A",
      "3319 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3220-A",
    "brand": "SKF",
    "manufacturer_designation": "3220 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 60.3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 178,
    "static_load_kN": 166,
    "fatigue_load_limit_kN": 6,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "weight_g": 6100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3220 A is SKF's 100 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 100×180×60.3 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 100×180×60.3 mm (3.937×7.087×2.374 in), 40.0 mm radial section height, C 178 kN, C0 166 kN, Pu 6 kN.reference speed 3,800 r/min (thermal) and limiting speed 3,200 r/min (mechanical), catalogue mass 6100 g. Load balance: C0 166 kN against C 178 kN gives a 0.93 ratio, typical of a double-row bidirectional design; Pu 6 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 100 mm bore: 178 kN C divided by the 40.0 mm radial section height gives 4.5 kN per section millimetre; the 6100 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 180 over bore 100 is a 1.80× step for this size, and the 60.3 mm width gives a bore/width ratio of 1.66; use these ratios when housing space around the 100 mm shaft is the first constraint.",
    "applications": [
      "process pump and agitator drives",
      "crane and winch gearboxes",
      "paper-machine dryer-section gearing"
    ],
    "failure_modes": [
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Interference goes on the rotating ring (about k5 at 100 mm bore); the wide 60.3 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "A capped 3220-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "A capped 3220-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3220 A as the double a steel execution; the other order numbers of the 3220 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3220-A?",
        "a": "3220 A measures 100 mm bore × 180 mm OD × 60.3 mm width (3.937 × 7.087 × 2.374 in), mass about 6100 g. SKF 17000 ratings: C 178 kN, C0 166 kN, Pu 6 kN, reference speed 3,800 r/min (thermal) and limiting speed 3,200 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Why choose the double-row 3220 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3220",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3220-A",
      "3220 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3320-A",
    "brand": "SKF",
    "manufacturer_designation": "3320 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 82.6,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 255,
    "static_load_kN": 255,
    "fatigue_load_limit_kN": 8.65,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 13500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3320 A is SKF's 100 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 100×215×82.6 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 100×215×82.6 mm (3.937×8.465×3.252 in), 57.5 mm radial section height, C 255 kN, C0 255 kN, Pu 8.65 kN.reference speed 3,400 r/min (thermal) and limiting speed 2,800 r/min (mechanical), catalogue mass 13500 g. At the printed limiting speed of 2,800 r/min the mean pitch diameter dm ≈ 157.5 mm implies a dn value around 441k mm·r/min; the 3,400 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 82.6 mm width over a 57.5 mm section yields 1.44 mm of ring width per section millimetre, and the bearing weighs 13500 g for 255 kN of dynamic capacity — about 53 g per rated kN. Bore-to-OD planning: OD 215 over bore 100 is a 2.15× step for this size, and the 82.6 mm width gives a bore/width ratio of 1.21; use these ratios when housing space around the 100 mm shaft is the first constraint.",
    "applications": [
      "paper-machine dryer-section gearing",
      "cement and mineral processing drives",
      "heavy gearbox shafts carrying reversing thrust"
    ],
    "failure_modes": [
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Compared with a single-row pair of the same bore, the double-row 3320 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Compared with a single-row pair of the same bore, the double-row 3320 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "A capped 3320-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.",
      "Interference goes on the rotating ring (about k5 at 100 mm bore); the wide 82.6 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3320 A as the double a steel execution; the other order numbers of the 3320 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3320-A?",
        "a": "3320 A measures 100 mm bore × 215 mm OD × 82.6 mm width (3.937 × 8.465 × 3.252 in), mass about 13500 g. SKF 17000 ratings: C 255 kN, C0 255 kN, Pu 8.65 kN, reference speed 3,400 r/min (thermal) and limiting speed 2,800 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "What does the D mean in A?",
        "a": "D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB)."
      },
      {
        "q": "Does the 3320 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3320",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3320-A",
      "3320 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3222-A",
    "brand": "SKF",
    "manufacturer_designation": "3222 A",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 69.8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 212,
    "static_load_kN": 212,
    "fatigue_load_limit_kN": 7.2,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "weight_g": 8800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3222 A is SKF's 110 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 110×200×69.8 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 110×200×69.8 mm (4.331×7.874×2.748 in), 45.0 mm radial section height, C 212 kN, C0 212 kN, Pu 7.2 kN.reference speed 3,400 r/min (thermal) and limiting speed 2,800 r/min (mechanical), catalogue mass 8800 g. Sizing arithmetic on the 110 mm bore: 212 kN C divided by the 45.0 mm radial section height gives 4.7 kN per section millimetre; the 8800 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Mass and section check: 8800 g inside the 110×200×69.8 mm outline leaves a 45.0 mm radial section, and the 212 kN static rating is 1.00× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: the reference speed is 3,400 r/min against a 2,800 r/min limiting speed, i.e. a reference-to-limit ratio of 1.21.",
    "applications": [
      "heavy gearbox shafts carrying reversing thrust",
      "process pump and agitator drives",
      "crane and winch gearboxes"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "fretting corrosion on a loose rotating shaft seat",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Interference goes on the rotating ring (about m6 at 110 mm bore); the wide 69.8 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Controlled axial clearance is the heart of the design: the A execution is produced to the standard double-row axial clearance; check residual clearance after mounting and at operating temperature.",
      "Compared with a single-row pair of the same bore, the double-row 3222 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.",
      "Interference goes on the rotating ring (about m6 at 110 mm bore); the wide 69.8 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3222 A as the double a steel execution; the other order numbers of the 3222 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3222-A?",
        "a": "3222 A measures 110 mm bore × 200 mm OD × 69.8 mm width (4.331 × 7.874 × 2.748 in), mass about 8800 g. SKF 17000 ratings: C 212 kN, C0 212 kN, Pu 7.2 kN, reference speed 3,400 r/min (thermal) and limiting speed 2,800 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Does the 3222 double-row bearing need pairing?",
        "a": "No — both ball rows are built into one bearing, so bidirectional location does not require a second unit. Controlled axial clearance is part of the design rather than a field adjustment."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly m6 on the 110 mm shaft and H7 in the 200 mm housing; check the wide ring seats square because the 69.8 mm width is sensitive to tilt."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3222",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3222-A",
      "3222 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3322-A",
    "brand": "SKF",
    "manufacturer_designation": "3322 A",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 92.1,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 291,
    "static_load_kN": 305,
    "fatigue_load_limit_kN": 9.8,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "weight_g": 19000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3322 A is SKF's 110 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 110×240×92.1 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 110×240×92.1 mm (4.331×9.449×3.626 in), 65.0 mm radial section height, C 291 kN, C0 305 kN, Pu 9.8 kN.reference speed 3,000 r/min (thermal) and limiting speed 2,600 r/min (mechanical), catalogue mass 19000 g. Selection figures for 3322 A: the static-to-dynamic ratio C0/C is 1.05, Pu 9.8 kN is about 3 % of C, and catalogue mass works out to roughly 173 g per millimetre of bore. At the printed limiting speed of 2,600 r/min the mean pitch diameter dm ≈ 175.0 mm implies a dn value around 455k mm·r/min; the 3,000 r/min reference speed is the thermal-planning figure under catalogue load. Speed-ratio note for this exact unit: the reference speed is 3,000 r/min against a 2,600 r/min limiting speed, i.e. a reference-to-limit ratio of 1.15.",
    "applications": [
      "cement and mineral processing drives",
      "heavy gearbox shafts carrying reversing thrust",
      "process pump and agitator drives"
    ],
    "failure_modes": [
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive",
      "brinelling from pressing the ring home through the balls or from static overload",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "The double-row 3322 takes thrust in both directions by itself — that is the reason to choose it over two single-row bearings: one housing bore, one fit, built-in set geometry.",
      "The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.",
      "Interference goes on the rotating ring (about m6 at 110 mm bore); the wide 92.1 mm ring is sensitive to tilted seats, so check squareness before clamping.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3322 A as the double a steel execution; the other order numbers of the 3322 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3322-A?",
        "a": "3322 A measures 110 mm bore × 240 mm OD × 92.1 mm width (4.331 × 9.449 × 3.626 in), mass about 19000 g. SKF 17000 ratings: C 291 kN, C0 305 kN, Pu 9.8 kN, reference speed 3,000 r/min (thermal) and limiting speed 2,600 r/min (mechanical)."
      },
      {
        "q": "What does the A suffix mean?",
        "a": "A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage."
      },
      {
        "q": "Which fits should I use?",
        "a": "With a rotating inner ring use roughly m6 on the 110 mm shaft and H7 in the 240 mm housing; check the wide ring seats square because the 92.1 mm width is sensitive to tilt."
      },
      {
        "q": "Why choose the double-row 3322 instead of two single-row bearings?",
        "a": "The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3322",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3322-A",
      "3322 A"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3200-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3200 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.61,
    "static_load_kN": 4.3,
    "fatigue_load_limit_kN": 0.183,
    "limiting_speed_rpm": 24000,
    "max_rpm": 24000,
    "weight_g": 51,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3200 A-2Z is the capped double-row angular-contact ball bearing for a 10 mm shaft, 10×30×14 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 10×30×14 mm (0.394×1.181×0.551 in), 10.0 mm radial section height, C 7.61 kN, C0 4.3 kN, Pu 0.183 kN.SKF publishes only the 24,000 r/min limiting speed for this execution, catalogue mass 51 g. Load balance: C0 4.3 kN against C 7.61 kN gives a 0.57 ratio, typical of a steep-angle axial-oriented design; Pu 0.183 kN enters the SKF adjusted-life equation rather than the basic rating life. The 0.183 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 7.61/4.3 kN ratings and 51 g mass this execution carries about 0.76 kN of C per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 24,000 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "conveyor idlers and small drives",
      "domestic-appliance motors",
      "maintenance-free small gear and pump shafts"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Fit and fillet rules are unchanged from the open double-row 3200: j5 on a 10 mm rotating shaft, radii clearing the chamfer.",
      "Never wash 3200-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3200 A-2Z as the double shielded execution; the other order numbers of the 3200 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3200-A-2Z?",
        "a": "3200 A-2Z measures 10 mm bore × 30 mm OD × 14 mm width (0.394 × 1.181 × 0.551 in), mass about 51 g. SKF 17000 ratings: C 7.61 kN, C0 4.3 kN, Pu 0.183 kN, SKF publishes only the 24,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Is 3200-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      },
      {
        "q": "What is the difference between 3200 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3200-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×30×14 mm envelope with catalogue ratings within 10 %; 3200 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3200-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×30×14 mm envelope with catalogue ratings within 10 %; 3200 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3200-A-2Z",
      "3200 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3200-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3200 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.61,
    "static_load_kN": 4.3,
    "fatigue_load_limit_kN": 0.183,
    "limiting_speed_rpm": 17000,
    "max_rpm": 17000,
    "weight_g": 51,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3200 A-2RS1 is the capped double-row angular-contact ball bearing for a 10 mm shaft, 10×30×14 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 10×30×14 mm (0.394×1.181×0.551 in), 10.0 mm radial section height, C 7.61 kN, C0 4.3 kN, Pu 0.183 kN.SKF publishes only the 17,000 r/min limiting speed for this execution, catalogue mass 51 g. Sizing arithmetic on the 10 mm bore: 7.61 kN C divided by the 10.0 mm radial section height gives 0.8 kN per section millimetre; the 51 g mass and 2 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 14 mm width over a 10.0 mm section yields 1.40 mm of ring width per section millimetre, and the bearing weighs 51 g for 7.61 kN of dynamic capacity — about 7 g per rated kN. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 17,000 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "conveyor idlers and small drives",
      "domestic-appliance motors",
      "maintenance-free small gear and pump shafts"
    ],
    "failure_modes": [
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "tilted mounting that loads one double row more heavily than the other",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The capped speed ceiling is 17,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "Fit and fillet rules are unchanged from the open double-row 3200: j5 on a 10 mm rotating shaft, radii clearing the chamfer.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Fit and fillet rules are unchanged from the open double-row 3200: j5 on a 10 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3200 A-2RS1 as the double contactsealed execution; the other order numbers of the 3200 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3200-A-2RS1?",
        "a": "3200 A-2RS1 measures 10 mm bore × 30 mm OD × 14 mm width (0.394 × 1.181 × 0.551 in), mass about 51 g. SKF 17000 ratings: C 7.61 kN, C0 4.3 kN, Pu 0.183 kN, SKF publishes only the 17,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "Is 3200-A-2RS1 sealed for life?",
        "a": "Yes — the two -2RS1 contact NBR seals enclose a lifetime grease fill; there is no relubrication provision, and the seals cap the limiting speed at 17,000 r/min."
      },
      {
        "q": "What is the difference between 3200 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3200-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×30×14 mm envelope with catalogue ratings within 10 %; 3200 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3200-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×30×14 mm envelope with catalogue ratings within 10 %; 3200 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3200-A-2RS1",
      "3200 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3201-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3201 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 15.9,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.1,
    "static_load_kN": 5.6,
    "fatigue_load_limit_kN": 0.24,
    "limiting_speed_rpm": 22000,
    "max_rpm": 22000,
    "weight_g": 58,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3201 A-2Z is the capped double-row angular-contact ball bearing for a 12 mm shaft, 12×32×15.9 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 12×32×15.9 mm (0.472×1.26×0.626 in), 10.0 mm radial section height, C 10.1 kN, C0 5.6 kN, Pu 0.24 kN.SKF publishes only the 22,000 r/min limiting speed for this execution, catalogue mass 58 g. At the printed limiting speed of 22,000 r/min the mean pitch diameter dm ≈ 22.0 mm implies a dn value around 484k mm·r/min; only the limiting speed is published for this execution. Selection figures for 3201 A-2Z: the static-to-dynamic ratio C0/C is 0.55, Pu 0.24 kN is about 2 % of C, and catalogue mass works out to roughly 5 g per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 22,000 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "domestic-appliance motors",
      "maintenance-free small gear and pump shafts",
      "textile and office machinery"
    ],
    "failure_modes": [
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Open 3201 and capped 3201-A-2Z share the 12×32×15.9 mm envelope and 10.1/5.6 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Never wash 3201-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3201 A-2Z as the double shielded execution; the other order numbers of the 3201 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3201-A-2Z?",
        "a": "3201 A-2Z measures 12 mm bore × 32 mm OD × 15.9 mm width (0.472 × 1.26 × 0.626 in), mass about 58 g. SKF 17000 ratings: C 10.1 kN, C0 5.6 kN, Pu 0.24 kN, SKF publishes only the 22,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What is the difference between 3201 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3201?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3201-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×32×15.9 mm envelope with catalogue ratings within 10 %; 3201 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3201-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×32×15.9 mm envelope with catalogue ratings within 10 %; 3201 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3201-A-2Z",
      "3201 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3201-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3201 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 15.9,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.1,
    "static_load_kN": 5.6,
    "fatigue_load_limit_kN": 0.24,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 58,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3201 A-2RS1 is the capped double-row angular-contact ball bearing for a 12 mm shaft, 12×32×15.9 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 12×32×15.9 mm (0.472×1.26×0.626 in), 10.0 mm radial section height, C 10.1 kN, C0 5.6 kN, Pu 0.24 kN.SKF publishes only the 15,000 r/min limiting speed for this execution, catalogue mass 58 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 15,000 r/min and no separate thermal reference is published; at dm ≈ 22.0 mm the corresponding dn is approximately 330k mm·r/min. At the printed limiting speed of 15,000 r/min the mean pitch diameter dm ≈ 22.0 mm implies a dn value around 330k mm·r/min; only the limiting speed is published for this execution. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 15,000 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "textile and office machinery",
      "conveyor idlers and small drives",
      "domestic-appliance motors"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Fit and fillet rules are unchanged from the open double-row 3201: j5 on a 12 mm rotating shaft, radii clearing the chamfer.",
      "Open 3201 and capped 3201-A-2RS1 share the 12×32×15.9 mm envelope and 10.1/5.6 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Never wash 3201-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3201 A-2RS1 as the double contactsealed execution; the other order numbers of the 3201 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3201-A-2RS1?",
        "a": "3201 A-2RS1 measures 12 mm bore × 32 mm OD × 15.9 mm width (0.472 × 1.26 × 0.626 in), mass about 58 g. SKF 17000 ratings: C 10.1 kN, C0 5.6 kN, Pu 0.24 kN, SKF publishes only the 15,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "What loads can 3201-A-2RS1 take?",
        "a": "The same bidirectional combined loads as the open double-row 3201: C 10.1 kN, C0 5.6 kN, Pu 0.24 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3201-A-2RS1 sealed for life?",
        "a": "Yes — the two -2RS1 contact NBR seals enclose a lifetime grease fill; there is no relubrication provision, and the seals cap the limiting speed at 15,000 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3201-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×32×15.9 mm envelope with catalogue ratings within 10 %; 3201 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3201-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×32×15.9 mm envelope with catalogue ratings within 10 %; 3201 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3201-A-2RS1",
      "3201 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3202-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3202 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 15.9,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 11.2,
    "static_load_kN": 6.8,
    "fatigue_load_limit_kN": 0.285,
    "limiting_speed_rpm": 18000,
    "max_rpm": 18000,
    "weight_g": 66,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3202 A-2Z is the capped double-row angular-contact ball bearing for a 15 mm shaft, 15×35×15.9 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 15×35×15.9 mm (0.591×1.378×0.626 in), 10.0 mm radial section height, C 11.2 kN, C0 6.8 kN, Pu 0.285 kN.SKF publishes only the 18,000 r/min limiting speed for this execution, catalogue mass 66 g. The 0.285 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 11.2/6.8 kN ratings and 66 g mass this execution carries about 0.75 kN of C per millimetre of bore. Mass and section check: 66 g inside the 15×35×15.9 mm outline leaves a 10.0 mm radial section, and the 6.8 kN static rating is 0.61× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 35 over bore 15 is a 2.33× step for this size, and the 15.9 mm width gives a bore/width ratio of 0.94; use these ratios when housing space around the 15 mm shaft is the first constraint. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "maintenance-free small gear and pump shafts",
      "textile and office machinery",
      "conveyor idlers and small drives"
    ],
    "failure_modes": [
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "raceway staining from water in the lubricant during idle periods",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Open 3202 and capped 3202-A-2Z share the 15×35×15.9 mm envelope and 11.2/6.8 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Fit and fillet rules are unchanged from the open double-row 3202: j5 on a 15 mm rotating shaft, radii clearing the chamfer.",
      "Fit and fillet rules are unchanged from the open double-row 3202: j5 on a 15 mm rotating shaft, radii clearing the chamfer.",
      "Never wash 3202-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3202 A-2Z as the double shielded execution; the other order numbers of the 3202 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3202-A-2Z?",
        "a": "3202 A-2Z measures 15 mm bore × 35 mm OD × 15.9 mm width (0.591 × 1.378 × 0.626 in), mass about 66 g. SKF 17000 ratings: C 11.2 kN, C0 6.8 kN, Pu 0.285 kN, SKF publishes only the 18,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Can I wash or repack a capped 3202?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3202-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3202: C 11.2 kN, C0 6.8 kN, Pu 0.285 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3202-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×15.9 mm envelope with catalogue ratings within 10 %; 3202 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3202-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×15.9 mm envelope with catalogue ratings within 10 %; 3202 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3202-A-2Z",
      "3202 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3202-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3202 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 15.9,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 11.2,
    "static_load_kN": 6.8,
    "fatigue_load_limit_kN": 0.285,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 66,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3202 A-2RS1 is the capped double-row angular-contact ball bearing for a 15 mm shaft, 15×35×15.9 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 15×35×15.9 mm (0.591×1.378×0.626 in), 10.0 mm radial section height, C 11.2 kN, C0 6.8 kN, Pu 0.285 kN.SKF publishes only the 14,000 r/min limiting speed for this execution, catalogue mass 66 g. Load balance: C0 6.8 kN against C 11.2 kN gives a 0.61 ratio, typical of a steep-angle axial-oriented design; Pu 0.285 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 14,000 r/min and no separate thermal reference is published; at dm ≈ 25.0 mm the corresponding dn is approximately 350k mm·r/min. Bore-to-OD planning: OD 35 over bore 15 is a 2.33× step for this size, and the 15.9 mm width gives a bore/width ratio of 0.94; use these ratios when housing space around the 15 mm shaft is the first constraint. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "maintenance-free small gear and pump shafts",
      "textile and office machinery",
      "conveyor idlers and small drives"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Never wash 3202-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3202 A-2RS1 as the double contactsealed execution; the other order numbers of the 3202 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3202-A-2RS1?",
        "a": "3202 A-2RS1 measures 15 mm bore × 35 mm OD × 15.9 mm width (0.591 × 1.378 × 0.626 in), mass about 66 g. SKF 17000 ratings: C 11.2 kN, C0 6.8 kN, Pu 0.285 kN, SKF publishes only the 14,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "Can I wash or repack a capped 3202?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3202-A-2RS1 take?",
        "a": "The same bidirectional combined loads as the open double-row 3202: C 11.2 kN, C0 6.8 kN, Pu 0.285 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3202-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×15.9 mm envelope with catalogue ratings within 10 %; 3202 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3202-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×15.9 mm envelope with catalogue ratings within 10 %; 3202 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3202-A-2RS1",
      "3202 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3302-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3302 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15.1,
    "static_load_kN": 9.3,
    "fatigue_load_limit_kN": 0.4,
    "limiting_speed_rpm": 16000,
    "max_rpm": 16000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3302 A-2Z is the capped double-row angular-contact ball bearing for a 15 mm shaft, 15×42×19 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 15×42×19 mm (0.591×1.654×0.748 in), 13.5 mm radial section height, C 15.1 kN, C0 9.3 kN, Pu 0.4 kN.SKF publishes only the 16,000 r/min limiting speed for this execution, catalogue mass 130 g. Envelope economics: the 19 mm width over a 13.5 mm section yields 1.41 mm of ring width per section millimetre, and the bearing weighs 130 g for 15.1 kN of dynamic capacity — about 9 g per rated kN. At the printed limiting speed of 16,000 r/min the mean pitch diameter dm ≈ 28.5 mm implies a dn value around 456k mm·r/min; only the limiting speed is published for this execution. Bore-to-OD planning: OD 42 over bore 15 is a 2.80× step for this size, and the 19 mm width gives a bore/width ratio of 0.79; use these ratios when housing space around the 15 mm shaft is the first constraint. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "textile and office machinery",
      "conveyor idlers and small drives",
      "domestic-appliance motors"
    ],
    "failure_modes": [
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Never wash 3302-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3302 A-2Z as the double shielded execution; the other order numbers of the 3302 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3302-A-2Z?",
        "a": "3302 A-2Z measures 15 mm bore × 42 mm OD × 19 mm width (0.591 × 1.654 × 0.748 in), mass about 130 g. SKF 17000 ratings: C 15.1 kN, C0 9.3 kN, Pu 0.4 kN, SKF publishes only the 16,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What loads can 3302-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3302: C 15.1 kN, C0 9.3 kN, Pu 0.4 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3302-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3302-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×19 mm envelope with catalogue ratings within 10 %; 3302 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3302-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×19 mm envelope with catalogue ratings within 10 %; 3302 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3302-A-2Z",
      "3302 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3302-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3302 A-2RS1",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15.1,
    "static_load_kN": 9.3,
    "fatigue_load_limit_kN": 0.4,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3302 A-2RS1 is the capped double-row angular-contact ball bearing for a 15 mm shaft, 15×42×19 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 15×42×19 mm (0.591×1.654×0.748 in), 13.5 mm radial section height, C 15.1 kN, C0 9.3 kN, Pu 0.4 kN.SKF publishes only the 12,000 r/min limiting speed for this execution, catalogue mass 130 g. Selection figures for 3302 A-2RS1: the static-to-dynamic ratio C0/C is 0.62, Pu 0.4 kN is about 3 % of C, and catalogue mass works out to roughly 9 g per millimetre of bore. Envelope economics: the 19 mm width over a 13.5 mm section yields 1.41 mm of ring width per section millimetre, and the bearing weighs 130 g for 15.1 kN of dynamic capacity — about 9 g per rated kN. Bore-to-OD planning: OD 42 over bore 15 is a 2.80× step for this size, and the 19 mm width gives a bore/width ratio of 0.79; use these ratios when housing space around the 15 mm shaft is the first constraint. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "domestic-appliance motors",
      "maintenance-free small gear and pump shafts",
      "textile and office machinery"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "tilted mounting that loads one double row more heavily than the other",
      "brinelling from pressing the ring home through the balls or from static overload",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Fit and fillet rules are unchanged from the open double-row 3302: j5 on a 15 mm rotating shaft, radii clearing the chamfer.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3302 A-2RS1 as the double contactsealed execution; the other order numbers of the 3302 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3302-A-2RS1?",
        "a": "3302 A-2RS1 measures 15 mm bore × 42 mm OD × 19 mm width (0.591 × 1.654 × 0.748 in), mass about 130 g. SKF 17000 ratings: C 15.1 kN, C0 9.3 kN, Pu 0.4 kN, SKF publishes only the 12,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "What is the difference between 3302 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3302?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3302-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×19 mm envelope with catalogue ratings within 10 %; 3302 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3302-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×19 mm envelope with catalogue ratings within 10 %; 3302 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3302-A-2RS1",
      "3302 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3203-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3203 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 17.5,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 8.8,
    "fatigue_load_limit_kN": 0.365,
    "limiting_speed_rpm": 16000,
    "max_rpm": 16000,
    "weight_g": 100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3203 A-2Z is the capped double-row angular-contact ball bearing for a 17 mm shaft, 17×40×17.5 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 17×40×17.5 mm (0.669×1.575×0.689 in), 11.5 mm radial section height, C 14.3 kN, C0 8.8 kN, Pu 0.365 kN.SKF publishes only the 16,000 r/min limiting speed for this execution, catalogue mass 100 g. Envelope economics: the 17.5 mm width over a 11.5 mm section yields 1.52 mm of ring width per section millimetre, and the bearing weighs 100 g for 14.3 kN of dynamic capacity — about 7 g per rated kN. At the printed limiting speed of 16,000 r/min the mean pitch diameter dm ≈ 28.5 mm implies a dn value around 456k mm·r/min; only the limiting speed is published for this execution. Bore-to-OD planning: OD 40 over bore 17 is a 2.35× step for this size, and the 17.5 mm width gives a bore/width ratio of 0.97; use these ratios when housing space around the 17 mm shaft is the first constraint. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "textile and office machinery",
      "conveyor idlers and small drives",
      "domestic-appliance motors"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Never wash 3203-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "The capped speed ceiling is 16,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Never wash 3203-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3203 A-2Z as the double shielded execution; the other order numbers of the 3203 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3203-A-2Z?",
        "a": "3203 A-2Z measures 17 mm bore × 40 mm OD × 17.5 mm width (0.669 × 1.575 × 0.689 in), mass about 100 g. SKF 17000 ratings: C 14.3 kN, C0 8.8 kN, Pu 0.365 kN, SKF publishes only the 16,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What loads can 3203-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3203: C 14.3 kN, C0 8.8 kN, Pu 0.365 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3203-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3203-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×17.5 mm envelope with catalogue ratings within 10 %; 3203 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3203-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×17.5 mm envelope with catalogue ratings within 10 %; 3203 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3203-A-2Z",
      "3203 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3203-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3203 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 17.5,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 14.3,
    "static_load_kN": 8.8,
    "fatigue_load_limit_kN": 0.365,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3203 A-2RS1 is the capped double-row angular-contact ball bearing for a 17 mm shaft, 17×40×17.5 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 17×40×17.5 mm (0.669×1.575×0.689 in), 11.5 mm radial section height, C 14.3 kN, C0 8.8 kN, Pu 0.365 kN.SKF publishes only the 12,000 r/min limiting speed for this execution, catalogue mass 100 g. Selection figures for 3203 A-2RS1: the static-to-dynamic ratio C0/C is 0.62, Pu 0.365 kN is about 3 % of C, and catalogue mass works out to roughly 6 g per millimetre of bore. Envelope economics: the 17.5 mm width over a 11.5 mm section yields 1.52 mm of ring width per section millimetre, and the bearing weighs 100 g for 14.3 kN of dynamic capacity — about 7 g per rated kN. Bore-to-OD planning: OD 40 over bore 17 is a 2.35× step for this size, and the 17.5 mm width gives a bore/width ratio of 0.97; use these ratios when housing space around the 17 mm shaft is the first constraint. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "domestic-appliance motors",
      "maintenance-free small gear and pump shafts",
      "textile and office machinery"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "tilted mounting that loads one double row more heavily than the other",
      "brinelling from pressing the ring home through the balls or from static overload",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The capped speed ceiling is 12,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "Never wash 3203-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3203 A-2RS1 as the double contactsealed execution; the other order numbers of the 3203 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3203-A-2RS1?",
        "a": "3203 A-2RS1 measures 17 mm bore × 40 mm OD × 17.5 mm width (0.669 × 1.575 × 0.689 in), mass about 100 g. SKF 17000 ratings: C 14.3 kN, C0 8.8 kN, Pu 0.365 kN, SKF publishes only the 12,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "What is the difference between 3203 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3203?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3203-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×17.5 mm envelope with catalogue ratings within 10 %; 3203 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3203-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×17.5 mm envelope with catalogue ratings within 10 %; 3203 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3203-A-2RS1",
      "3203 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3303-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3303 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 22.2,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.6,
    "static_load_kN": 12.7,
    "fatigue_load_limit_kN": 0.54,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3303 A-2Z is the capped double-row angular-contact ball bearing for a 17 mm shaft, 17×47×22.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 17×47×22.2 mm (0.669×1.85×0.874 in), 15.0 mm radial section height, C 21.6 kN, C0 12.7 kN, Pu 0.54 kN.SKF publishes only the 14,000 r/min limiting speed for this execution, catalogue mass 180 g. The 0.54 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 21.6/12.7 kN ratings and 180 g mass this execution carries about 1.27 kN of C per millimetre of bore. Mass and section check: 180 g inside the 17×47×22.2 mm outline leaves a 15.0 mm radial section, and the 12.7 kN static rating is 0.59× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 47 over bore 17 is a 2.76× step for this size, and the 22.2 mm width gives a bore/width ratio of 0.77; use these ratios when housing space around the 17 mm shaft is the first constraint. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "maintenance-free small gear and pump shafts",
      "textile and office machinery",
      "conveyor idlers and small drives"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "tilted mounting that loads one double row more heavily than the other",
      "raceway staining from water in the lubricant during idle periods",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "The capped speed ceiling is 14,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Fit and fillet rules are unchanged from the open double-row 3303: j5 on a 17 mm rotating shaft, radii clearing the chamfer.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3303 A-2Z as the double shielded execution; the other order numbers of the 3303 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3303-A-2Z?",
        "a": "3303 A-2Z measures 17 mm bore × 47 mm OD × 22.2 mm width (0.669 × 1.85 × 0.874 in), mass about 180 g. SKF 17000 ratings: C 21.6 kN, C0 12.7 kN, Pu 0.54 kN, SKF publishes only the 14,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Can I wash or repack a capped 3303?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3303-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3303: C 21.6 kN, C0 12.7 kN, Pu 0.54 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3303-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×22.2 mm envelope with catalogue ratings within 10 %; 3303 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3303-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×22.2 mm envelope with catalogue ratings within 10 %; 3303 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3303-A-2Z",
      "3303 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3303-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3303 A-2RS1",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 22.2,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.6,
    "static_load_kN": 12.7,
    "fatigue_load_limit_kN": 0.54,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3303 A-2RS1 is the capped double-row angular-contact ball bearing for a 17 mm shaft, 17×47×22.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 17×47×22.2 mm (0.669×1.85×0.874 in), 15.0 mm radial section height, C 21.6 kN, C0 12.7 kN, Pu 0.54 kN.SKF publishes only the 11,000 r/min limiting speed for this execution, catalogue mass 180 g. Load balance: C0 12.7 kN against C 21.6 kN gives a 0.59 ratio, typical of a steep-angle axial-oriented design; Pu 0.54 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 11,000 r/min and no separate thermal reference is published; at dm ≈ 32.0 mm the corresponding dn is approximately 352k mm·r/min. Bore-to-OD planning: OD 47 over bore 17 is a 2.76× step for this size, and the 22.2 mm width gives a bore/width ratio of 0.77; use these ratios when housing space around the 17 mm shaft is the first constraint. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "maintenance-free small gear and pump shafts",
      "textile and office machinery",
      "conveyor idlers and small drives"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "tilted mounting that loads one double row more heavily than the other",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Open 3303 and capped 3303-A-2RS1 share the 17×47×22.2 mm envelope and 21.6/12.7 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Never wash 3303-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Never wash 3303-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3303 A-2RS1 as the double contactsealed execution; the other order numbers of the 3303 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3303-A-2RS1?",
        "a": "3303 A-2RS1 measures 17 mm bore × 47 mm OD × 22.2 mm width (0.669 × 1.85 × 0.874 in), mass about 180 g. SKF 17000 ratings: C 21.6 kN, C0 12.7 kN, Pu 0.54 kN, SKF publishes only the 11,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "Can I wash or repack a capped 3303?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3303-A-2RS1 take?",
        "a": "The same bidirectional combined loads as the open double-row 3303: C 21.6 kN, C0 12.7 kN, Pu 0.54 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3303-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×22.2 mm envelope with catalogue ratings within 10 %; 3303 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3303-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×22.2 mm envelope with catalogue ratings within 10 %; 3303 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3303-A-2RS1",
      "3303 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3204-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3204 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 20.6,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 20.4,
    "static_load_kN": 12.9,
    "fatigue_load_limit_kN": 0.55,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3204 A-2Z is the capped double-row angular-contact ball bearing for a 20 mm shaft, 20×47×20.6 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 20×47×20.6 mm (0.787×1.85×0.811 in), 13.5 mm radial section height, C 20.4 kN, C0 12.9 kN, Pu 0.55 kN.SKF publishes only the 14,000 r/min limiting speed for this execution, catalogue mass 160 g. Mass and section check: 160 g inside the 20×47×20.6 mm outline leaves a 13.5 mm radial section, and the 12.9 kN static rating is 0.63× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Sizing arithmetic on the 20 mm bore: 20.4 kN C divided by the 13.5 mm radial section height gives 1.5 kN per section millimetre; the 160 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 14,000 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "conveyor idlers and small drives",
      "domestic-appliance motors",
      "maintenance-free small gear and pump shafts"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "tilted mounting that loads one double row more heavily than the other",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Fit and fillet rules are unchanged from the open double-row 3204: k5 on a 20 mm rotating shaft, radii clearing the chamfer.",
      "Never wash 3204-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3204 A-2Z as the double shielded execution; the other order numbers of the 3204 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3204-A-2Z?",
        "a": "3204 A-2Z measures 20 mm bore × 47 mm OD × 20.6 mm width (0.787 × 1.85 × 0.811 in), mass about 160 g. SKF 17000 ratings: C 20.4 kN, C0 12.9 kN, Pu 0.55 kN, SKF publishes only the 14,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Is 3204-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      },
      {
        "q": "What is the difference between 3204 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3204-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×20.6 mm envelope with catalogue ratings within 10 %; 3204 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3204-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×20.6 mm envelope with catalogue ratings within 10 %; 3204 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3204-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×20.6 mm envelope with catalogue ratings within 10 %; 3204 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3204-A-2Z",
      "3204 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3204-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3204 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 20.6,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 20.4,
    "static_load_kN": 12.9,
    "fatigue_load_limit_kN": 0.55,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3204 A-2RS1 is the capped double-row angular-contact ball bearing for a 20 mm shaft, 20×47×20.6 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 20×47×20.6 mm (0.787×1.85×0.811 in), 13.5 mm radial section height, C 20.4 kN, C0 12.9 kN, Pu 0.55 kN.SKF publishes only the 10,000 r/min limiting speed for this execution, catalogue mass 160 g. The 0.55 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 20.4/12.9 kN ratings and 160 g mass this execution carries about 1.02 kN of C per millimetre of bore. Selection figures for 3204 A-2RS1: the static-to-dynamic ratio C0/C is 0.63, Pu 0.55 kN is about 3 % of C, and catalogue mass works out to roughly 8 g per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 10,000 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "conveyor idlers and small drives",
      "domestic-appliance motors",
      "maintenance-free small gear and pump shafts"
    ],
    "failure_modes": [
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "tilted mounting that loads one double row more heavily than the other",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Open 3204 and capped 3204-A-2RS1 share the 20×47×20.6 mm envelope and 20.4/12.9 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Never wash 3204-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Fit and fillet rules are unchanged from the open double-row 3204: k5 on a 20 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3204 A-2RS1 as the double contactsealed execution; the other order numbers of the 3204 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3204-A-2RS1?",
        "a": "3204 A-2RS1 measures 20 mm bore × 47 mm OD × 20.6 mm width (0.787 × 1.85 × 0.811 in), mass about 160 g. SKF 17000 ratings: C 20.4 kN, C0 12.9 kN, Pu 0.55 kN, SKF publishes only the 10,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "Is 3204-A-2RS1 sealed for life?",
        "a": "Yes — the two -2RS1 contact NBR seals enclose a lifetime grease fill; there is no relubrication provision, and the seals cap the limiting speed at 10,000 r/min."
      },
      {
        "q": "What is the difference between 3204 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3204-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×20.6 mm envelope with catalogue ratings within 10 %; 3204 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3204-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×20.6 mm envelope with catalogue ratings within 10 %; 3204 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3204-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×20.6 mm envelope with catalogue ratings within 10 %; 3204 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3204-A-2RS1",
      "3204 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3304-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3304 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 22.2,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 23.6,
    "static_load_kN": 14.6,
    "fatigue_load_limit_kN": 0.62,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 220,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3304 A-2Z is the capped double-row angular-contact ball bearing for a 20 mm shaft, 20×52×22.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 20×52×22.2 mm (0.787×2.047×0.874 in), 16.0 mm radial section height, C 23.6 kN, C0 14.6 kN, Pu 0.62 kN.SKF publishes only the 13,000 r/min limiting speed for this execution, catalogue mass 220 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 13,000 r/min and no separate thermal reference is published; at dm ≈ 36.0 mm the corresponding dn is approximately 468k mm·r/min. Envelope economics: the 22.2 mm width over a 16.0 mm section yields 1.39 mm of ring width per section millimetre, and the bearing weighs 220 g for 23.6 kN of dynamic capacity — about 9 g per rated kN. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 13,000 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "domestic-appliance motors",
      "maintenance-free small gear and pump shafts",
      "textile and office machinery"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Open 3304 and capped 3304-A-2Z share the 20×52×22.2 mm envelope and 23.6/14.6 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Open 3304 and capped 3304-A-2Z share the 20×52×22.2 mm envelope and 23.6/14.6 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Fit and fillet rules are unchanged from the open double-row 3304: k5 on a 20 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3304 A-2Z as the double shielded execution; the other order numbers of the 3304 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3304-A-2Z?",
        "a": "3304 A-2Z measures 20 mm bore × 52 mm OD × 22.2 mm width (0.787 × 2.047 × 0.874 in), mass about 220 g. SKF 17000 ratings: C 23.6 kN, C0 14.6 kN, Pu 0.62 kN, SKF publishes only the 13,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What is the difference between 3304 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3304?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3304-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×22.2 mm envelope with catalogue ratings within 10 %; 3304 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3304-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×22.2 mm envelope with catalogue ratings within 10 %; 3304 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3304-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×22.2 mm envelope with catalogue ratings within 10 %; 3304 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3304-A-2Z",
      "3304 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3304-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3304 A-2RS1",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 22.2,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 23.6,
    "static_load_kN": 14.6,
    "fatigue_load_limit_kN": 0.62,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 220,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3304 A-2RS1 is the capped double-row angular-contact ball bearing for a 20 mm shaft, 20×52×22.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 20×52×22.2 mm (0.787×2.047×0.874 in), 16.0 mm radial section height, C 23.6 kN, C0 14.6 kN, Pu 0.62 kN.SKF publishes only the 9,000 r/min limiting speed for this execution, catalogue mass 220 g. At the printed limiting speed of 9,000 r/min the mean pitch diameter dm ≈ 36.0 mm implies a dn value around 324k mm·r/min; only the limiting speed is published for this execution. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 9,000 r/min and no separate thermal reference is published; at dm ≈ 36.0 mm the corresponding dn is approximately 324k mm·r/min. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 9,000 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "textile and office machinery",
      "conveyor idlers and small drives",
      "domestic-appliance motors"
    ],
    "failure_modes": [
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "tilted mounting that loads one double row more heavily than the other",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Open 3304 and capped 3304-A-2RS1 share the 20×52×22.2 mm envelope and 23.6/14.6 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Fit and fillet rules are unchanged from the open double-row 3304: k5 on a 20 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3304 A-2RS1 as the double contactsealed execution; the other order numbers of the 3304 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3304-A-2RS1?",
        "a": "3304 A-2RS1 measures 20 mm bore × 52 mm OD × 22.2 mm width (0.787 × 2.047 × 0.874 in), mass about 220 g. SKF 17000 ratings: C 23.6 kN, C0 14.6 kN, Pu 0.62 kN, SKF publishes only the 9,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "What loads can 3304-A-2RS1 take?",
        "a": "The same bidirectional combined loads as the open double-row 3304: C 23.6 kN, C0 14.6 kN, Pu 0.62 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3304-A-2RS1 sealed for life?",
        "a": "Yes — the two -2RS1 contact NBR seals enclose a lifetime grease fill; there is no relubrication provision, and the seals cap the limiting speed at 9,000 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3304-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×22.2 mm envelope with catalogue ratings within 10 %; 3304 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3304-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×22.2 mm envelope with catalogue ratings within 10 %; 3304 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3304-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×22.2 mm envelope with catalogue ratings within 10 %; 3304 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3304-A-2RS1",
      "3304 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3205-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3205 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 20.6,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.6,
    "static_load_kN": 14.3,
    "fatigue_load_limit_kN": 0.6,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3205 A-2Z is the capped double-row angular-contact ball bearing for a 25 mm shaft, 25×52×20.6 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 25×52×20.6 mm (0.984×2.047×0.811 in), 13.5 mm radial section height, C 21.6 kN, C0 14.3 kN, Pu 0.6 kN.SKF publishes only the 12,000 r/min limiting speed for this execution, catalogue mass 180 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 12,000 r/min and no separate thermal reference is published; at dm ≈ 38.5 mm the corresponding dn is approximately 462k mm·r/min. Envelope economics: the 20.6 mm width over a 13.5 mm section yields 1.53 mm of ring width per section millimetre, and the bearing weighs 180 g for 21.6 kN of dynamic capacity — about 8 g per rated kN. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 12,000 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "agricultural machinery drives",
      "conveyor drum shafts",
      "fan and blower positions"
    ],
    "failure_modes": [
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Open 3205 and capped 3205-A-2Z share the 25×52×20.6 mm envelope and 21.6/14.3 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "The capped speed ceiling is 12,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "Fit and fillet rules are unchanged from the open double-row 3205: k5 on a 25 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3205 A-2Z as the double shielded execution; the other order numbers of the 3205 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3205-A-2Z?",
        "a": "3205 A-2Z measures 25 mm bore × 52 mm OD × 20.6 mm width (0.984 × 2.047 × 0.811 in), mass about 180 g. SKF 17000 ratings: C 21.6 kN, C0 14.3 kN, Pu 0.6 kN, SKF publishes only the 12,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What is the difference between 3205 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3205?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3205-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×20.6 mm envelope with catalogue ratings within 10 %; 3205 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3205-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×20.6 mm envelope with catalogue ratings within 10 %; 3205 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3205-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×20.6 mm envelope with catalogue ratings within 10 %; 3205 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3205-A-2Z",
      "3205 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3205-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3205 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 20.6,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.6,
    "static_load_kN": 14.3,
    "fatigue_load_limit_kN": 0.6,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3205 A-2RS1 is the capped double-row angular-contact ball bearing for a 25 mm shaft, 25×52×20.6 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 25×52×20.6 mm (0.984×2.047×0.811 in), 13.5 mm radial section height, C 21.6 kN, C0 14.3 kN, Pu 0.6 kN.SKF publishes only the 8,500 r/min limiting speed for this execution, catalogue mass 180 g. At the printed limiting speed of 8,500 r/min the mean pitch diameter dm ≈ 38.5 mm implies a dn value around 327k mm·r/min; only the limiting speed is published for this execution. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 8,500 r/min and no separate thermal reference is published; at dm ≈ 38.5 mm the corresponding dn is approximately 327k mm·r/min. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 8,500 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "conveyor drum shafts",
      "fan and blower positions",
      "material-handling equipment"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "tilted mounting that loads one double row more heavily than the other",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Fit and fillet rules are unchanged from the open double-row 3205: k5 on a 25 mm rotating shaft, radii clearing the chamfer.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The capped speed ceiling is 8,500 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3205 A-2RS1 as the double contactsealed execution; the other order numbers of the 3205 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3205-A-2RS1?",
        "a": "3205 A-2RS1 measures 25 mm bore × 52 mm OD × 20.6 mm width (0.984 × 2.047 × 0.811 in), mass about 180 g. SKF 17000 ratings: C 21.6 kN, C0 14.3 kN, Pu 0.6 kN, SKF publishes only the 8,500 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "What loads can 3205-A-2RS1 take?",
        "a": "The same bidirectional combined loads as the open double-row 3205: C 21.6 kN, C0 14.3 kN, Pu 0.6 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3205-A-2RS1 sealed for life?",
        "a": "Yes — the two -2RS1 contact NBR seals enclose a lifetime grease fill; there is no relubrication provision, and the seals cap the limiting speed at 8,500 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3205-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×20.6 mm envelope with catalogue ratings within 10 %; 3205 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3205-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×20.6 mm envelope with catalogue ratings within 10 %; 3205 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3205-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×20.6 mm envelope with catalogue ratings within 10 %; 3205 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3205-A-2RS1",
      "3205 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3305-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3305 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 25.4,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32,
    "static_load_kN": 20.4,
    "fatigue_load_limit_kN": 0.865,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3305 A-2Z is the capped double-row angular-contact ball bearing for a 25 mm shaft, 25×62×25.4 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 25×62×25.4 mm (0.984×2.441×1 in), 18.5 mm radial section height, C 32 kN, C0 20.4 kN, Pu 0.865 kN.SKF publishes only the 11,000 r/min limiting speed for this execution, catalogue mass 350 g. Mass and section check: 350 g inside the 25×62×25.4 mm outline leaves a 18.5 mm radial section, and the 20.4 kN static rating is 0.64× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Sizing arithmetic on the 25 mm bore: 32 kN C divided by the 18.5 mm radial section height gives 1.7 kN per section millimetre; the 350 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 11,000 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "fan and blower positions",
      "material-handling equipment",
      "lifetime-lubricated electric motor and gearbox positions"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Never wash 3305-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Never wash 3305-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3305 A-2Z as the double shielded execution; the other order numbers of the 3305 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3305-A-2Z?",
        "a": "3305 A-2Z measures 25 mm bore × 62 mm OD × 25.4 mm width (0.984 × 2.441 × 1 in), mass about 350 g. SKF 17000 ratings: C 32 kN, C0 20.4 kN, Pu 0.865 kN, SKF publishes only the 11,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Is 3305-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      },
      {
        "q": "What is the difference between 3305 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3305-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×25.4 mm envelope with catalogue ratings within 10 %; 3305 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3305-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×25.4 mm envelope with catalogue ratings within 10 %; 3305 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3305-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×25.4 mm envelope with catalogue ratings within 10 %; 3305 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3305-A-2Z",
      "3305 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3305-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3305 A-2RS1",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 25.4,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32,
    "static_load_kN": 20.4,
    "fatigue_load_limit_kN": 0.865,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3305 A-2RS1 is the capped double-row angular-contact ball bearing for a 25 mm shaft, 25×62×25.4 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 25×62×25.4 mm (0.984×2.441×1 in), 18.5 mm radial section height, C 32 kN, C0 20.4 kN, Pu 0.865 kN.SKF publishes only the 7,500 r/min limiting speed for this execution, catalogue mass 350 g. The 0.865 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 32/20.4 kN ratings and 350 g mass this execution carries about 1.28 kN of C per millimetre of bore. Selection figures for 3305 A-2RS1: the static-to-dynamic ratio C0/C is 0.64, Pu 0.865 kN is about 3 % of C, and catalogue mass works out to roughly 14 g per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 7,500 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "agricultural machinery drives",
      "conveyor drum shafts",
      "fan and blower positions"
    ],
    "failure_modes": [
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Open 3305 and capped 3305-A-2RS1 share the 25×62×25.4 mm envelope and 32/20.4 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Never wash 3305-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Fit and fillet rules are unchanged from the open double-row 3305: k5 on a 25 mm rotating shaft, radii clearing the chamfer.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3305 A-2RS1 as the double contactsealed execution; the other order numbers of the 3305 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3305-A-2RS1?",
        "a": "3305 A-2RS1 measures 25 mm bore × 62 mm OD × 25.4 mm width (0.984 × 2.441 × 1 in), mass about 350 g. SKF 17000 ratings: C 32 kN, C0 20.4 kN, Pu 0.865 kN, SKF publishes only the 7,500 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "Is 3305-A-2RS1 sealed for life?",
        "a": "Yes — the two -2RS1 contact NBR seals enclose a lifetime grease fill; there is no relubrication provision, and the seals cap the limiting speed at 7,500 r/min."
      },
      {
        "q": "What is the difference between 3305 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3305-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×25.4 mm envelope with catalogue ratings within 10 %; 3305 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3305-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×25.4 mm envelope with catalogue ratings within 10 %; 3305 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3305-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×25.4 mm envelope with catalogue ratings within 10 %; 3305 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3305-A-2RS1",
      "3305 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3206-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3206 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 23.8,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 30,
    "static_load_kN": 20.4,
    "fatigue_load_limit_kN": 0.865,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3206 A-2Z is the capped double-row angular-contact ball bearing for a 30 mm shaft, 30×62×23.8 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 30×62×23.8 mm (1.181×2.441×0.937 in), 16.0 mm radial section height, C 30 kN, C0 20.4 kN, Pu 0.865 kN.SKF publishes only the 10,000 r/min limiting speed for this execution, catalogue mass 290 g. Sizing arithmetic on the 30 mm bore: 30 kN C divided by the 16.0 mm radial section height gives 1.9 kN per section millimetre; the 290 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 20.4 kN against C 30 kN gives a 0.68 ratio, typical of a steep-angle axial-oriented design; Pu 0.865 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 62 over bore 30 is a 2.07× step for this size, and the 23.8 mm width gives a bore/width ratio of 1.26; use these ratios when housing space around the 30 mm shaft is the first constraint. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "lifetime-lubricated electric motor and gearbox positions",
      "agricultural machinery drives",
      "conveyor drum shafts"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "fretting corrosion on a loose rotating shaft seat",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Open 3206 and capped 3206-A-2Z share the 30×62×23.8 mm envelope and 30/20.4 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Fit and fillet rules are unchanged from the open double-row 3206: k5 on a 30 mm rotating shaft, radii clearing the chamfer.",
      "Fit and fillet rules are unchanged from the open double-row 3206: k5 on a 30 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3206 A-2Z as the double shielded execution; the other order numbers of the 3206 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3206-A-2Z?",
        "a": "3206 A-2Z measures 30 mm bore × 62 mm OD × 23.8 mm width (1.181 × 2.441 × 0.937 in), mass about 290 g. SKF 17000 ratings: C 30 kN, C0 20.4 kN, Pu 0.865 kN, SKF publishes only the 10,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Can I wash or repack a capped 3206?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3206-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3206: C 30 kN, C0 20.4 kN, Pu 0.865 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3206-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×23.8 mm envelope with catalogue ratings within 10 %; 3206 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3206-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×23.8 mm envelope with catalogue ratings within 10 %; 3206 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3206-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×23.8 mm envelope with catalogue ratings within 10 %; 3206 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3206-A-2Z",
      "3206 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3206-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3206 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 23.8,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 30,
    "static_load_kN": 20.4,
    "fatigue_load_limit_kN": 0.865,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3206 A-2RS1 is the capped double-row angular-contact ball bearing for a 30 mm shaft, 30×62×23.8 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 30×62×23.8 mm (1.181×2.441×0.937 in), 16.0 mm radial section height, C 30 kN, C0 20.4 kN, Pu 0.865 kN.SKF publishes only the 7,500 r/min limiting speed for this execution, catalogue mass 290 g. Mass and section check: 290 g inside the 30×62×23.8 mm outline leaves a 16.0 mm radial section, and the 20.4 kN static rating is 0.68× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 7,500 r/min the mean pitch diameter dm ≈ 46.0 mm implies a dn value around 345k mm·r/min; only the limiting speed is published for this execution. Bore-to-OD planning: OD 62 over bore 30 is a 2.07× step for this size, and the 23.8 mm width gives a bore/width ratio of 1.26; use these ratios when housing space around the 30 mm shaft is the first constraint. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "material-handling equipment",
      "lifetime-lubricated electric motor and gearbox positions",
      "agricultural machinery drives"
    ],
    "failure_modes": [
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "The capped speed ceiling is 7,500 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "Never wash 3206-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Fit and fillet rules are unchanged from the open double-row 3206: k5 on a 30 mm rotating shaft, radii clearing the chamfer.",
      "Never wash 3206-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3206 A-2RS1 as the double contactsealed execution; the other order numbers of the 3206 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3206-A-2RS1?",
        "a": "3206 A-2RS1 measures 30 mm bore × 62 mm OD × 23.8 mm width (1.181 × 2.441 × 0.937 in), mass about 290 g. SKF 17000 ratings: C 30 kN, C0 20.4 kN, Pu 0.865 kN, SKF publishes only the 7,500 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "Can I wash or repack a capped 3206?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3206-A-2RS1 take?",
        "a": "The same bidirectional combined loads as the open double-row 3206: C 30 kN, C0 20.4 kN, Pu 0.865 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3206-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×23.8 mm envelope with catalogue ratings within 10 %; 3206 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3206-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×23.8 mm envelope with catalogue ratings within 10 %; 3206 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3206-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×23.8 mm envelope with catalogue ratings within 10 %; 3206 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3206-A-2RS1",
      "3206 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3306-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3306 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 42.5,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 1.27,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 520,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3306 A-2Z is the capped double-row angular-contact ball bearing for a 30 mm shaft, 30×72×30.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 30×72×30.2 mm (1.181×2.835×1.189 in), 21.0 mm radial section height, C 42.5 kN, C0 30 kN, Pu 1.27 kN.SKF publishes only the 9,000 r/min limiting speed for this execution, catalogue mass 520 g. Selection figures for 3306 A-2Z: the static-to-dynamic ratio C0/C is 0.71, Pu 1.27 kN is about 3 % of C, and catalogue mass works out to roughly 17 g per millimetre of bore. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 9,000 r/min and no separate thermal reference is published; at dm ≈ 51.0 mm the corresponding dn is approximately 459k mm·r/min. Bore-to-OD planning: OD 72 over bore 30 is a 2.40× step for this size, and the 30.2 mm width gives a bore/width ratio of 0.99; use these ratios when housing space around the 30 mm shaft is the first constraint. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "lifetime-lubricated electric motor and gearbox positions",
      "agricultural machinery drives",
      "conveyor drum shafts"
    ],
    "failure_modes": [
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "brinelling from pressing the ring home through the balls or from static overload",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Never wash 3306-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3306 A-2Z as the double shielded execution; the other order numbers of the 3306 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3306-A-2Z?",
        "a": "3306 A-2Z measures 30 mm bore × 72 mm OD × 30.2 mm width (1.181 × 2.835 × 1.189 in), mass about 520 g. SKF 17000 ratings: C 42.5 kN, C0 30 kN, Pu 1.27 kN, SKF publishes only the 9,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What loads can 3306-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3306: C 42.5 kN, C0 30 kN, Pu 1.27 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3306-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3306-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×30.2 mm envelope with catalogue ratings within 10 %; 3306 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3306-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×30.2 mm envelope with catalogue ratings within 10 %; 3306 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3306-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×30.2 mm envelope with catalogue ratings within 10 %; 3306 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3306-A-2Z",
      "3306 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3306-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3306 A-2RS1",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 42.5,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 1.27,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 520,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3306 A-2RS1 is the capped double-row angular-contact ball bearing for a 30 mm shaft, 30×72×30.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 30×72×30.2 mm (1.181×2.835×1.189 in), 21.0 mm radial section height, C 42.5 kN, C0 30 kN, Pu 1.27 kN.SKF publishes only the 6,300 r/min limiting speed for this execution, catalogue mass 520 g. Envelope economics: the 30.2 mm width over a 21.0 mm section yields 1.44 mm of ring width per section millimetre, and the bearing weighs 520 g for 42.5 kN of dynamic capacity — about 12 g per rated kN. Selection figures for 3306 A-2RS1: the static-to-dynamic ratio C0/C is 0.71, Pu 1.27 kN is about 3 % of C, and catalogue mass works out to roughly 17 g per millimetre of bore. Bore-to-OD planning: OD 72 over bore 30 is a 2.40× step for this size, and the 30.2 mm width gives a bore/width ratio of 0.99; use these ratios when housing space around the 30 mm shaft is the first constraint. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "material-handling equipment",
      "lifetime-lubricated electric motor and gearbox positions",
      "agricultural machinery drives"
    ],
    "failure_modes": [
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Never wash 3306-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Open 3306 and capped 3306-A-2RS1 share the 30×72×30.2 mm envelope and 42.5/30 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Open 3306 and capped 3306-A-2RS1 share the 30×72×30.2 mm envelope and 42.5/30 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3306 A-2RS1 as the double contactsealed execution; the other order numbers of the 3306 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3306-A-2RS1?",
        "a": "3306 A-2RS1 measures 30 mm bore × 72 mm OD × 30.2 mm width (1.181 × 2.835 × 1.189 in), mass about 520 g. SKF 17000 ratings: C 42.5 kN, C0 30 kN, Pu 1.27 kN, SKF publishes only the 6,300 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "What is the difference between 3306 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3306?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3306-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×30.2 mm envelope with catalogue ratings within 10 %; 3306 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3306-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×30.2 mm envelope with catalogue ratings within 10 %; 3306 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3306-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×30.2 mm envelope with catalogue ratings within 10 %; 3306 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3306-A-2RS1",
      "3306 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3207-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3207 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 40,
    "static_load_kN": 28,
    "fatigue_load_limit_kN": 1.18,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 440,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3207 A-2Z is the capped double-row angular-contact ball bearing for a 35 mm shaft, 35×72×27 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 35×72×27 mm (1.378×2.835×1.063 in), 18.5 mm radial section height, C 40 kN, C0 28 kN, Pu 1.18 kN.SKF publishes only the 9,000 r/min limiting speed for this execution, catalogue mass 440 g. Selection figures for 3207 A-2Z: the static-to-dynamic ratio C0/C is 0.70, Pu 1.18 kN is about 3 % of C, and catalogue mass works out to roughly 13 g per millimetre of bore. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 9,000 r/min and no separate thermal reference is published; at dm ≈ 53.5 mm the corresponding dn is approximately 482k mm·r/min. Bore-to-OD planning: OD 72 over bore 35 is a 2.06× step for this size, and the 27 mm width gives a bore/width ratio of 1.30; use these ratios when housing space around the 35 mm shaft is the first constraint. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "conveyor drum shafts",
      "fan and blower positions",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "tilted mounting that loads one double row more heavily than the other",
      "brinelling from pressing the ring home through the balls or from static overload",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Open 3207 and capped 3207-A-2Z share the 35×72×27 mm envelope and 40/28 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Fit and fillet rules are unchanged from the open double-row 3207: k5 on a 35 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3207 A-2Z as the double shielded execution; the other order numbers of the 3207 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3207-A-2Z?",
        "a": "3207 A-2Z measures 35 mm bore × 72 mm OD × 27 mm width (1.378 × 2.835 × 1.063 in), mass about 440 g. SKF 17000 ratings: C 40 kN, C0 28 kN, Pu 1.18 kN, SKF publishes only the 9,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What loads can 3207-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3207: C 40 kN, C0 28 kN, Pu 1.18 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3207-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3207-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3207-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3207-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3207-A-2Z",
      "3207 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3207-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3207 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 40,
    "static_load_kN": 28,
    "fatigue_load_limit_kN": 1.18,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 440,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3207 A-2RS1 is the capped double-row angular-contact ball bearing for a 35 mm shaft, 35×72×27 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 35×72×27 mm (1.378×2.835×1.063 in), 18.5 mm radial section height, C 40 kN, C0 28 kN, Pu 1.18 kN.SKF publishes only the 6,300 r/min limiting speed for this execution, catalogue mass 440 g. Envelope economics: the 27 mm width over a 18.5 mm section yields 1.46 mm of ring width per section millimetre, and the bearing weighs 440 g for 40 kN of dynamic capacity — about 11 g per rated kN. Selection figures for 3207 A-2RS1: the static-to-dynamic ratio C0/C is 0.70, Pu 1.18 kN is about 3 % of C, and catalogue mass works out to roughly 13 g per millimetre of bore. Bore-to-OD planning: OD 72 over bore 35 is a 2.06× step for this size, and the 27 mm width gives a bore/width ratio of 1.30; use these ratios when housing space around the 35 mm shaft is the first constraint. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "fan and blower positions",
      "material-handling equipment",
      "lifetime-lubricated electric motor and gearbox positions"
    ],
    "failure_modes": [
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Fit and fillet rules are unchanged from the open double-row 3207: k5 on a 35 mm rotating shaft, radii clearing the chamfer.",
      "The capped speed ceiling is 6,300 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "Open 3207 and capped 3207-A-2RS1 share the 35×72×27 mm envelope and 40/28 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Fit and fillet rules are unchanged from the open double-row 3207: k5 on a 35 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3207 A-2RS1 as the double contactsealed execution; the other order numbers of the 3207 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3207-A-2RS1?",
        "a": "3207 A-2RS1 measures 35 mm bore × 72 mm OD × 27 mm width (1.378 × 2.835 × 1.063 in), mass about 440 g. SKF 17000 ratings: C 40 kN, C0 28 kN, Pu 1.18 kN, SKF publishes only the 6,300 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "What is the difference between 3207 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3207?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3207-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3207-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3207-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×27 mm envelope with catalogue ratings within 10 %; 3207 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3207-A-2RS1",
      "3207 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3307-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3307 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 34.9,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 52,
    "static_load_kN": 35.5,
    "fatigue_load_limit_kN": 1.5,
    "limiting_speed_rpm": 8500,
    "max_rpm": 8500,
    "weight_g": 740,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3307 A-2Z is the capped double-row angular-contact ball bearing for a 35 mm shaft, 35×80×34.9 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 35×80×34.9 mm (1.378×3.15×1.374 in), 22.5 mm radial section height, C 52 kN, C0 35.5 kN, Pu 1.5 kN.SKF publishes only the 8,500 r/min limiting speed for this execution, catalogue mass 740 g. Sizing arithmetic on the 35 mm bore: 52 kN C divided by the 22.5 mm radial section height gives 2.3 kN per section millimetre; the 740 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 35.5 kN against C 52 kN gives a 0.68 ratio, typical of a steep-angle axial-oriented design; Pu 1.5 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 80 over bore 35 is a 2.29× step for this size, and the 34.9 mm width gives a bore/width ratio of 1.00; use these ratios when housing space around the 35 mm shaft is the first constraint. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "conveyor drum shafts",
      "fan and blower positions",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "tilted mounting that loads one double row more heavily than the other",
      "fretting corrosion on a loose rotating shaft seat",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Fit and fillet rules are unchanged from the open double-row 3307: k5 on a 35 mm rotating shaft, radii clearing the chamfer.",
      "Fit and fillet rules are unchanged from the open double-row 3307: k5 on a 35 mm rotating shaft, radii clearing the chamfer.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3307 A-2Z as the double shielded execution; the other order numbers of the 3307 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3307-A-2Z?",
        "a": "3307 A-2Z measures 35 mm bore × 80 mm OD × 34.9 mm width (1.378 × 3.15 × 1.374 in), mass about 740 g. SKF 17000 ratings: C 52 kN, C0 35.5 kN, Pu 1.5 kN, SKF publishes only the 8,500 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Can I wash or repack a capped 3307?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3307-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3307: C 52 kN, C0 35.5 kN, Pu 1.5 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3307-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×34.9 mm envelope with catalogue ratings within 10 %; 3307 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3307-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×34.9 mm envelope with catalogue ratings within 10 %; 3307 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3307-DJ1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×34.9 mm envelope, but catalogue C/C0 differ between executions (52/35.5 kN vs 52.7/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3307-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×34.9 mm envelope with catalogue ratings within 10 %; 3307 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3307-A-2Z",
      "3307 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3307-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3307 A-2RS1",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 34.9,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 52,
    "static_load_kN": 35.5,
    "fatigue_load_limit_kN": 1.5,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 740,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3307 A-2RS1 is the capped double-row angular-contact ball bearing for a 35 mm shaft, 35×80×34.9 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 35×80×34.9 mm (1.378×3.15×1.374 in), 22.5 mm radial section height, C 52 kN, C0 35.5 kN, Pu 1.5 kN.SKF publishes only the 6,000 r/min limiting speed for this execution, catalogue mass 740 g. Mass and section check: 740 g inside the 35×80×34.9 mm outline leaves a 22.5 mm radial section, and the 35.5 kN static rating is 0.68× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 6,000 r/min the mean pitch diameter dm ≈ 57.5 mm implies a dn value around 345k mm·r/min; only the limiting speed is published for this execution. Bore-to-OD planning: OD 80 over bore 35 is a 2.29× step for this size, and the 34.9 mm width gives a bore/width ratio of 1.00; use these ratios when housing space around the 35 mm shaft is the first constraint. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "material-handling equipment",
      "lifetime-lubricated electric motor and gearbox positions",
      "agricultural machinery drives"
    ],
    "failure_modes": [
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "The capped speed ceiling is 6,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "Fit and fillet rules are unchanged from the open double-row 3307: k5 on a 35 mm rotating shaft, radii clearing the chamfer.",
      "Fit and fillet rules are unchanged from the open double-row 3307: k5 on a 35 mm rotating shaft, radii clearing the chamfer.",
      "Fit and fillet rules are unchanged from the open double-row 3307: k5 on a 35 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3307 A-2RS1 as the double contactsealed execution; the other order numbers of the 3307 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3307-A-2RS1?",
        "a": "3307 A-2RS1 measures 35 mm bore × 80 mm OD × 34.9 mm width (1.378 × 3.15 × 1.374 in), mass about 740 g. SKF 17000 ratings: C 52 kN, C0 35.5 kN, Pu 1.5 kN, SKF publishes only the 6,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "Can I wash or repack a capped 3307?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3307-A-2RS1 take?",
        "a": "The same bidirectional combined loads as the open double-row 3307: C 52 kN, C0 35.5 kN, Pu 1.5 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3307-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×34.9 mm envelope with catalogue ratings within 10 %; 3307 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3307-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×34.9 mm envelope with catalogue ratings within 10 %; 3307 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3307-DJ1",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×34.9 mm envelope, but catalogue C/C0 differ between executions (52/35.5 kN vs 52.7/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3307-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×34.9 mm envelope with catalogue ratings within 10 %; 3307 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3307-A-2RS1",
      "3307 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3208-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3208 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 48,
    "static_load_kN": 36.5,
    "fatigue_load_limit_kN": 1.56,
    "limiting_speed_rpm": 8000,
    "max_rpm": 8000,
    "weight_g": 570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3208 A-2Z is the capped double-row angular-contact ball bearing for a 40 mm shaft, 40×80×30.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 40×80×30.2 mm (1.575×3.15×1.189 in), 20.0 mm radial section height, C 48 kN, C0 36.5 kN, Pu 1.56 kN.SKF publishes only the 8,000 r/min limiting speed for this execution, catalogue mass 570 g. Load balance: C0 36.5 kN against C 48 kN gives a 0.76 ratio, typical of a steep-angle axial-oriented design; Pu 1.56 kN enters the SKF adjusted-life equation rather than the basic rating life. The 1.56 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 48/36.5 kN ratings and 570 g mass this execution carries about 1.20 kN of C per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 8,000 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "conveyor drum shafts",
      "fan and blower positions",
      "material-handling equipment"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "tilted mounting that loads one double row more heavily than the other",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The capped speed ceiling is 8,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "Fit and fillet rules are unchanged from the open double-row 3208: k5 on a 40 mm rotating shaft, radii clearing the chamfer.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Fit and fillet rules are unchanged from the open double-row 3208: k5 on a 40 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3208 A-2Z as the double shielded execution; the other order numbers of the 3208 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3208-A-2Z?",
        "a": "3208 A-2Z measures 40 mm bore × 80 mm OD × 30.2 mm width (1.575 × 3.15 × 1.189 in), mass about 570 g. SKF 17000 ratings: C 48 kN, C0 36.5 kN, Pu 1.56 kN, SKF publishes only the 8,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Is 3208-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      },
      {
        "q": "What is the difference between 3208 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3208-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3208-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3208-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3208-A-2Z",
      "3208 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3208-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3208 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 48,
    "static_load_kN": 36.5,
    "fatigue_load_limit_kN": 1.56,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3208 A-2RS1 is the capped double-row angular-contact ball bearing for a 40 mm shaft, 40×80×30.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 40×80×30.2 mm (1.575×3.15×1.189 in), 20.0 mm radial section height, C 48 kN, C0 36.5 kN, Pu 1.56 kN.SKF publishes only the 5,600 r/min limiting speed for this execution, catalogue mass 570 g. Sizing arithmetic on the 40 mm bore: 48 kN C divided by the 20.0 mm radial section height gives 2.4 kN per section millimetre; the 570 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 30.2 mm width over a 20.0 mm section yields 1.51 mm of ring width per section millimetre, and the bearing weighs 570 g for 48 kN of dynamic capacity — about 12 g per rated kN. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 5,600 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "agricultural machinery drives",
      "conveyor drum shafts",
      "fan and blower positions"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Open 3208 and capped 3208-A-2RS1 share the 40×80×30.2 mm envelope and 48/36.5 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Fit and fillet rules are unchanged from the open double-row 3208: k5 on a 40 mm rotating shaft, radii clearing the chamfer.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Never wash 3208-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3208 A-2RS1 as the double contactsealed execution; the other order numbers of the 3208 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3208-A-2RS1?",
        "a": "3208 A-2RS1 measures 40 mm bore × 80 mm OD × 30.2 mm width (1.575 × 3.15 × 1.189 in), mass about 570 g. SKF 17000 ratings: C 48 kN, C0 36.5 kN, Pu 1.56 kN, SKF publishes only the 5,600 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "Is 3208-A-2RS1 sealed for life?",
        "a": "Yes — the two -2RS1 contact NBR seals enclose a lifetime grease fill; there is no relubrication provision, and the seals cap the limiting speed at 5,600 r/min."
      },
      {
        "q": "What is the difference between 3208 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3208-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3208-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3208-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×30.2 mm envelope with catalogue ratings within 10 %; 3208 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3208-A-2RS1",
      "3208 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3308-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3308 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 36.5,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 64,
    "static_load_kN": 44,
    "fatigue_load_limit_kN": 1.86,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 930,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3308 A-2Z is the capped double-row angular-contact ball bearing for a 40 mm shaft, 40×90×36.5 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 40×90×36.5 mm (1.575×3.543×1.437 in), 25.0 mm radial section height, C 64 kN, C0 44 kN, Pu 1.86 kN.SKF publishes only the 7,500 r/min limiting speed for this execution, catalogue mass 930 g. At the printed limiting speed of 7,500 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 488k mm·r/min; only the limiting speed is published for this execution. Selection figures for 3308 A-2Z: the static-to-dynamic ratio C0/C is 0.69, Pu 1.86 kN is about 3 % of C, and catalogue mass works out to roughly 23 g per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 7,500 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "agricultural machinery drives",
      "conveyor drum shafts",
      "fan and blower positions"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "The capped speed ceiling is 7,500 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "The capped speed ceiling is 7,500 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3308 A-2Z as the double shielded execution; the other order numbers of the 3308 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3308-A-2Z?",
        "a": "3308 A-2Z measures 40 mm bore × 90 mm OD × 36.5 mm width (1.575 × 3.543 × 1.437 in), mass about 930 g. SKF 17000 ratings: C 64 kN, C0 44 kN, Pu 1.86 kN, SKF publishes only the 7,500 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What is the difference between 3308 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3308?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3308-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (64/44 kN vs 49.4/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3308-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3308-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (64/44 kN vs 68.9/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-DTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (64/44 kN vs 68.9/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3308-A-2Z",
      "3308 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3308-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3308 A-2RS1",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 36.5,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 64,
    "static_load_kN": 44,
    "fatigue_load_limit_kN": 1.86,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 930,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3308 A-2RS1 is the capped double-row angular-contact ball bearing for a 40 mm shaft, 40×90×36.5 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 40×90×36.5 mm (1.575×3.543×1.437 in), 25.0 mm radial section height, C 64 kN, C0 44 kN, Pu 1.86 kN.SKF publishes only the 5,000 r/min limiting speed for this execution, catalogue mass 930 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,000 r/min and no separate thermal reference is published; at dm ≈ 65.0 mm the corresponding dn is approximately 325k mm·r/min. At the printed limiting speed of 5,000 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 325k mm·r/min; only the limiting speed is published for this execution. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 5,000 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "fan and blower positions",
      "material-handling equipment",
      "lifetime-lubricated electric motor and gearbox positions"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Never wash 3308-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3308 A-2RS1 as the double contactsealed execution; the other order numbers of the 3308 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3308-A-2RS1?",
        "a": "3308 A-2RS1 measures 40 mm bore × 90 mm OD × 36.5 mm width (1.575 × 3.543 × 1.437 in), mass about 930 g. SKF 17000 ratings: C 64 kN, C0 44 kN, Pu 1.86 kN, SKF publishes only the 5,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "What loads can 3308-A-2RS1 take?",
        "a": "The same bidirectional combined loads as the open double-row 3308: C 64 kN, C0 44 kN, Pu 1.86 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3308-A-2RS1 sealed for life?",
        "a": "Yes — the two -2RS1 contact NBR seals enclose a lifetime grease fill; there is no relubrication provision, and the seals cap the limiting speed at 5,000 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3308-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (64/44 kN vs 49.4/41.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3308-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3308-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (64/44 kN vs 68.9/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-DTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×36.5 mm envelope, but catalogue C/C0 differ between executions (64/44 kN vs 68.9/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3308-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×36.5 mm envelope with catalogue ratings within 10 %; 3308 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3308-A-2RS1",
      "3308 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3209-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3209 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 51,
    "static_load_kN": 39,
    "fatigue_load_limit_kN": 1.63,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "weight_g": 630,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3209 A-2Z is the capped double-row angular-contact ball bearing for a 45 mm shaft, 45×85×30.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 45×85×30.2 mm (1.772×3.346×1.189 in), 20.0 mm radial section height, C 51 kN, C0 39 kN, Pu 1.63 kN.SKF publishes only the 7,500 r/min limiting speed for this execution, catalogue mass 630 g. At the printed limiting speed of 7,500 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 488k mm·r/min; only the limiting speed is published for this execution. Selection figures for 3209 A-2Z: the static-to-dynamic ratio C0/C is 0.76, Pu 1.63 kN is about 3 % of C, and catalogue mass works out to roughly 14 g per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 7,500 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "lifetime-lubricated electric motor and gearbox positions",
      "agricultural machinery drives",
      "conveyor drum shafts"
    ],
    "failure_modes": [
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "edge loading from shaft deflection or housing misalignment",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Open 3209 and capped 3209-A-2Z share the 45×85×30.2 mm envelope and 51/39 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Never wash 3209-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3209 A-2Z as the double shielded execution; the other order numbers of the 3209 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3209-A-2Z?",
        "a": "3209 A-2Z measures 45 mm bore × 85 mm OD × 30.2 mm width (1.772 × 3.346 × 1.189 in), mass about 630 g. SKF 17000 ratings: C 51 kN, C0 39 kN, Pu 1.63 kN, SKF publishes only the 7,500 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What is the difference between 3209 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3209?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3209-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×30.2 mm envelope with catalogue ratings within 10 %; 3209 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3209-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×30.2 mm envelope with catalogue ratings within 10 %; 3209 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3209-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×30.2 mm envelope with catalogue ratings within 10 %; 3209 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3209-A-2Z",
      "3209 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3209-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3209 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 51,
    "static_load_kN": 39,
    "fatigue_load_limit_kN": 1.63,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 630,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3209 A-2RS1 is the capped double-row angular-contact ball bearing for a 45 mm shaft, 45×85×30.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 45×85×30.2 mm (1.772×3.346×1.189 in), 20.0 mm radial section height, C 51 kN, C0 39 kN, Pu 1.63 kN.SKF publishes only the 5,300 r/min limiting speed for this execution, catalogue mass 630 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,300 r/min and no separate thermal reference is published; at dm ≈ 65.0 mm the corresponding dn is approximately 345k mm·r/min. At the printed limiting speed of 5,300 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 345k mm·r/min; only the limiting speed is published for this execution. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 5,300 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "material-handling equipment",
      "lifetime-lubricated electric motor and gearbox positions",
      "agricultural machinery drives"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Never wash 3209-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Open 3209 and capped 3209-A-2RS1 share the 45×85×30.2 mm envelope and 51/39 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "The capped speed ceiling is 5,300 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3209 A-2RS1 as the double contactsealed execution; the other order numbers of the 3209 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3209-A-2RS1?",
        "a": "3209 A-2RS1 measures 45 mm bore × 85 mm OD × 30.2 mm width (1.772 × 3.346 × 1.189 in), mass about 630 g. SKF 17000 ratings: C 51 kN, C0 39 kN, Pu 1.63 kN, SKF publishes only the 5,300 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "What loads can 3209-A-2RS1 take?",
        "a": "The same bidirectional combined loads as the open double-row 3209: C 51 kN, C0 39 kN, Pu 1.63 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3209-A-2RS1 sealed for life?",
        "a": "Yes — the two -2RS1 contact NBR seals enclose a lifetime grease fill; there is no relubrication provision, and the seals cap the limiting speed at 5,300 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3209-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×30.2 mm envelope with catalogue ratings within 10 %; 3209 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3209-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×30.2 mm envelope with catalogue ratings within 10 %; 3209 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3209-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×30.2 mm envelope with catalogue ratings within 10 %; 3209 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3209-A-2RS1",
      "3209 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3309-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3309 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 39.7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 75,
    "static_load_kN": 53,
    "fatigue_load_limit_kN": 2.24,
    "limiting_speed_rpm": 6700,
    "max_rpm": 6700,
    "weight_g": 1250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3309 A-2Z is the capped double-row angular-contact ball bearing for a 45 mm shaft, 45×100×39.7 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 45×100×39.7 mm (1.772×3.937×1.563 in), 27.5 mm radial section height, C 75 kN, C0 53 kN, Pu 2.24 kN.SKF publishes only the 6,700 r/min limiting speed for this execution, catalogue mass 1250 g. Load balance: C0 53 kN against C 75 kN gives a 0.71 ratio, typical of a steep-angle axial-oriented design; Pu 2.24 kN enters the SKF adjusted-life equation rather than the basic rating life. The 2.24 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 75/53 kN ratings and 1250 g mass this execution carries about 1.67 kN of C per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 6,700 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "agricultural machinery drives",
      "conveyor drum shafts",
      "fan and blower positions"
    ],
    "failure_modes": [
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The capped speed ceiling is 6,700 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Never wash 3309-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3309 A-2Z as the double shielded execution; the other order numbers of the 3309 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3309-A-2Z?",
        "a": "3309 A-2Z measures 45 mm bore × 100 mm OD × 39.7 mm width (1.772 × 3.937 × 1.563 in), mass about 1250 g. SKF 17000 ratings: C 75 kN, C0 53 kN, Pu 2.24 kN, SKF publishes only the 6,700 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Is 3309-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      },
      {
        "q": "What is the difference between 3309 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3309-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (75/53 kN vs 61.8/52 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×39.7 mm envelope with catalogue ratings within 10 %; 3309 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3309-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×39.7 mm envelope with catalogue ratings within 10 %; 3309 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3309-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (75/53 kN vs 79.3/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×39.7 mm envelope with catalogue ratings within 10 %; 3309 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3309-A-2Z",
      "3309 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3309-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3309 A-2RS1",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 39.7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 75,
    "static_load_kN": 53,
    "fatigue_load_limit_kN": 2.24,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 1250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3309 A-2RS1 is the capped double-row angular-contact ball bearing for a 45 mm shaft, 45×100×39.7 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 45×100×39.7 mm (1.772×3.937×1.563 in), 27.5 mm radial section height, C 75 kN, C0 53 kN, Pu 2.24 kN.SKF publishes only the 4,800 r/min limiting speed for this execution, catalogue mass 1250 g. Sizing arithmetic on the 45 mm bore: 75 kN C divided by the 27.5 mm radial section height gives 2.7 kN per section millimetre; the 1250 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 39.7 mm width over a 27.5 mm section yields 1.44 mm of ring width per section millimetre, and the bearing weighs 1250 g for 75 kN of dynamic capacity — about 17 g per rated kN. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 4,800 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "agricultural machinery drives",
      "conveyor drum shafts",
      "fan and blower positions"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The capped speed ceiling is 4,800 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "Never wash 3309-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Never wash 3309-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3309 A-2RS1 as the double contactsealed execution; the other order numbers of the 3309 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3309-A-2RS1?",
        "a": "3309 A-2RS1 measures 45 mm bore × 100 mm OD × 39.7 mm width (1.772 × 3.937 × 1.563 in), mass about 1250 g. SKF 17000 ratings: C 75 kN, C0 53 kN, Pu 2.24 kN, SKF publishes only the 4,800 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "Is 3309-A-2RS1 sealed for life?",
        "a": "Yes — the two -2RS1 contact NBR seals enclose a lifetime grease fill; there is no relubrication provision, and the seals cap the limiting speed at 4,800 r/min."
      },
      {
        "q": "What is the difference between 3309 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3309-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (75/53 kN vs 61.8/52 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×39.7 mm envelope with catalogue ratings within 10 %; 3309 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3309-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×39.7 mm envelope with catalogue ratings within 10 %; 3309 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3309-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×39.7 mm envelope, but catalogue C/C0 differ between executions (75/53 kN vs 79.3/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3309-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×39.7 mm envelope with catalogue ratings within 10 %; 3309 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3309-A-2RS1",
      "3309 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3210-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3210 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 51,
    "static_load_kN": 42.5,
    "fatigue_load_limit_kN": 1.8,
    "limiting_speed_rpm": 7000,
    "max_rpm": 7000,
    "weight_g": 650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3210 A-2Z is the capped double-row angular-contact ball bearing for a 50 mm shaft, 50×90×30.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 50×90×30.2 mm (1.969×3.543×1.189 in), 20.0 mm radial section height, C 51 kN, C0 42.5 kN, Pu 1.8 kN.SKF publishes only the 7,000 r/min limiting speed for this execution, catalogue mass 650 g. Selection figures for 3210 A-2Z: the static-to-dynamic ratio C0/C is 0.83, Pu 1.8 kN is about 4 % of C, and catalogue mass works out to roughly 13 g per millimetre of bore. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 7,000 r/min and no separate thermal reference is published; at dm ≈ 70.0 mm the corresponding dn is approximately 490k mm·r/min. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 7,000 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "agricultural machinery drives",
      "conveyor drum shafts",
      "fan and blower positions"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Fit and fillet rules are unchanged from the open double-row 3210: k5 on a 50 mm rotating shaft, radii clearing the chamfer.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Open 3210 and capped 3210-A-2Z share the 50×90×30.2 mm envelope and 51/42.5 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3210 A-2Z as the double shielded execution; the other order numbers of the 3210 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3210-A-2Z?",
        "a": "3210 A-2Z measures 50 mm bore × 90 mm OD × 30.2 mm width (1.969 × 3.543 × 1.189 in), mass about 650 g. SKF 17000 ratings: C 51 kN, C0 42.5 kN, Pu 1.8 kN, SKF publishes only the 7,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What loads can 3210-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3210: C 51 kN, C0 42.5 kN, Pu 1.8 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3210-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3210-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3210-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3210-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3210-A-2Z",
      "3210 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3210-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3210 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 30.2,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 51,
    "static_load_kN": 42.5,
    "fatigue_load_limit_kN": 1.8,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3210 A-2RS1 is the capped double-row angular-contact ball bearing for a 50 mm shaft, 50×90×30.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 50×90×30.2 mm (1.969×3.543×1.189 in), 20.0 mm radial section height, C 51 kN, C0 42.5 kN, Pu 1.8 kN.SKF publishes only the 4,800 r/min limiting speed for this execution, catalogue mass 650 g. Envelope economics: the 30.2 mm width over a 20.0 mm section yields 1.51 mm of ring width per section millimetre, and the bearing weighs 650 g for 51 kN of dynamic capacity — about 13 g per rated kN. Selection figures for 3210 A-2RS1: the static-to-dynamic ratio C0/C is 0.83, Pu 1.8 kN is about 4 % of C, and catalogue mass works out to roughly 13 g per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 4,800 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "material-handling equipment",
      "lifetime-lubricated electric motor and gearbox positions",
      "agricultural machinery drives"
    ],
    "failure_modes": [
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Never wash 3210-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The capped speed ceiling is 4,800 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "Fit and fillet rules are unchanged from the open double-row 3210: k5 on a 50 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3210 A-2RS1 as the double contactsealed execution; the other order numbers of the 3210 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3210-A-2RS1?",
        "a": "3210 A-2RS1 measures 50 mm bore × 90 mm OD × 30.2 mm width (1.969 × 3.543 × 1.189 in), mass about 650 g. SKF 17000 ratings: C 51 kN, C0 42.5 kN, Pu 1.8 kN, SKF publishes only the 4,800 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "What is the difference between 3210 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3210?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3210-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3210-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3210-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×30.2 mm envelope with catalogue ratings within 10 %; 3210 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3210-A-2RS1",
      "3210 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3310-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3310 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 44.4,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 90,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 2.75,
    "limiting_speed_rpm": 6000,
    "max_rpm": 6000,
    "weight_g": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3310 A-2Z is the capped double-row angular-contact ball bearing for a 50 mm shaft, 50×110×44.4 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 50×110×44.4 mm (1.969×4.331×1.748 in), 30.0 mm radial section height, C 90 kN, C0 64 kN, Pu 2.75 kN.SKF publishes only the 6,000 r/min limiting speed for this execution, catalogue mass 1700 g. The 2.75 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 90/64 kN ratings and 1700 g mass this execution carries about 1.80 kN of C per millimetre of bore. Mass and section check: 1700 g inside the 50×110×44.4 mm outline leaves a 30.0 mm radial section, and the 64 kN static rating is 0.71× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 6,000 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "fan and blower positions",
      "material-handling equipment",
      "lifetime-lubricated electric motor and gearbox positions"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Never wash 3310-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3310 A-2Z as the double shielded execution; the other order numbers of the 3310 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3310-A-2Z?",
        "a": "3310 A-2Z measures 50 mm bore × 110 mm OD × 44.4 mm width (1.969 × 4.331 × 1.748 in), mass about 1700 g. SKF 17000 ratings: C 90 kN, C0 64 kN, Pu 2.75 kN, SKF publishes only the 6,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Can I wash or repack a capped 3310?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3310-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3310: C 90 kN, C0 64 kN, Pu 2.75 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3310-DNRCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 DNRCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×44.4 mm envelope, but catalogue C/C0 differ between executions (90/64 kN vs 93.6/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3310-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3310-A-2Z",
      "3310 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3310-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3310 A-2RS1",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 44.4,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 90,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 2.75,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3310 A-2RS1 is the capped double-row angular-contact ball bearing for a 50 mm shaft, 50×110×44.4 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 50×110×44.4 mm (1.969×4.331×1.748 in), 30.0 mm radial section height, C 90 kN, C0 64 kN, Pu 2.75 kN.SKF publishes only the 4,300 r/min limiting speed for this execution, catalogue mass 1700 g. Load balance: C0 64 kN against C 90 kN gives a 0.71 ratio, typical of a steep-angle axial-oriented design; Pu 2.75 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,300 r/min and no separate thermal reference is published; at dm ≈ 80.0 mm the corresponding dn is approximately 344k mm·r/min. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 4,300 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "material-handling equipment",
      "lifetime-lubricated electric motor and gearbox positions",
      "agricultural machinery drives"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "The capped speed ceiling is 4,300 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "Fit and fillet rules are unchanged from the open double-row 3310: k5 on a 50 mm rotating shaft, radii clearing the chamfer.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Fit and fillet rules are unchanged from the open double-row 3310: k5 on a 50 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3310 A-2RS1 as the double contactsealed execution; the other order numbers of the 3310 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3310-A-2RS1?",
        "a": "3310 A-2RS1 measures 50 mm bore × 110 mm OD × 44.4 mm width (1.969 × 4.331 × 1.748 in), mass about 1700 g. SKF 17000 ratings: C 90 kN, C0 64 kN, Pu 2.75 kN, SKF publishes only the 4,300 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "Can I wash or repack a capped 3310?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3310-A-2RS1 take?",
        "a": "The same bidirectional combined loads as the open double-row 3310: C 90 kN, C0 64 kN, Pu 2.75 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3310-DNRCBM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 DNRCBM is the brass cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3310-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×44.4 mm envelope, but catalogue C/C0 differ between executions (90/64 kN vs 93.6/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3310-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×44.4 mm envelope with catalogue ratings within 10 %; 3310 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3310-A-2RS1",
      "3310 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3211-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3211 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 33.3,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 60,
    "static_load_kN": 47.5,
    "fatigue_load_limit_kN": 2,
    "limiting_speed_rpm": 6300,
    "max_rpm": 6300,
    "weight_g": 910,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3211 A-2Z is the capped double-row angular-contact ball bearing for a 55 mm shaft, 55×100×33.3 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 55×100×33.3 mm (2.165×3.937×1.311 in), 22.5 mm radial section height, C 60 kN, C0 47.5 kN, Pu 2 kN.SKF publishes only the 6,300 r/min limiting speed for this execution, catalogue mass 910 g. Sizing arithmetic on the 55 mm bore: 60 kN C divided by the 22.5 mm radial section height gives 2.7 kN per section millimetre; the 910 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 47.5 kN against C 60 kN gives a 0.79 ratio, typical of a steep-angle axial-oriented design; Pu 2 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 6,300 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "lifetime-lubricated electric motor and gearbox positions",
      "agricultural machinery drives",
      "conveyor drum shafts"
    ],
    "failure_modes": [
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "The capped speed ceiling is 6,300 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Fit and fillet rules are unchanged from the open double-row 3211: k5 on a 55 mm rotating shaft, radii clearing the chamfer.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3211 A-2Z as the double shielded execution; the other order numbers of the 3211 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3211-A-2Z?",
        "a": "3211 A-2Z measures 55 mm bore × 100 mm OD × 33.3 mm width (2.165 × 3.937 × 1.311 in), mass about 910 g. SKF 17000 ratings: C 60 kN, C0 47.5 kN, Pu 2 kN, SKF publishes only the 6,300 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Can I wash or repack a capped 3211?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3211-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3211: C 60 kN, C0 47.5 kN, Pu 2 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3211-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3211-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3211-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3211-A-2Z",
      "3211 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3211-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3211 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 33.3,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 60,
    "static_load_kN": 47.5,
    "fatigue_load_limit_kN": 2,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 910,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3211 A-2RS1 is the capped double-row angular-contact ball bearing for a 55 mm shaft, 55×100×33.3 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 55×100×33.3 mm (2.165×3.937×1.311 in), 22.5 mm radial section height, C 60 kN, C0 47.5 kN, Pu 2 kN.SKF publishes only the 4,500 r/min limiting speed for this execution, catalogue mass 910 g. Mass and section check: 910 g inside the 55×100×33.3 mm outline leaves a 22.5 mm radial section, and the 47.5 kN static rating is 0.79× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 4,500 r/min the mean pitch diameter dm ≈ 77.5 mm implies a dn value around 349k mm·r/min; only the limiting speed is published for this execution. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 4,500 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "agricultural machinery drives",
      "conveyor drum shafts",
      "fan and blower positions"
    ],
    "failure_modes": [
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Fit and fillet rules are unchanged from the open double-row 3211: k5 on a 55 mm rotating shaft, radii clearing the chamfer.",
      "Fit and fillet rules are unchanged from the open double-row 3211: k5 on a 55 mm rotating shaft, radii clearing the chamfer.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3211 A-2RS1 as the double contactsealed execution; the other order numbers of the 3211 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3211-A-2RS1?",
        "a": "3211 A-2RS1 measures 55 mm bore × 100 mm OD × 33.3 mm width (2.165 × 3.937 × 1.311 in), mass about 910 g. SKF 17000 ratings: C 60 kN, C0 47.5 kN, Pu 2 kN, SKF publishes only the 4,500 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "Can I wash or repack a capped 3211?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3211-A-2RS1 take?",
        "a": "The same bidirectional combined loads as the open double-row 3211: C 60 kN, C0 47.5 kN, Pu 2 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3211-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3211-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3211-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×33.3 mm envelope with catalogue ratings within 10 %; 3211 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3211-A-2RS1",
      "3211 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3311-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3311 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 49.2,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 112,
    "static_load_kN": 81.5,
    "fatigue_load_limit_kN": 3.45,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3311 A-2Z is the capped double-row angular-contact ball bearing for a 55 mm shaft, 55×120×49.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 55×120×49.2 mm (2.165×4.724×1.937 in), 32.5 mm radial section height, C 112 kN, C0 81.5 kN, Pu 3.45 kN.SKF publishes only the 5,300 r/min limiting speed for this execution, catalogue mass 2650 g. Envelope economics: the 49.2 mm width over a 32.5 mm section yields 1.51 mm of ring width per section millimetre, and the bearing weighs 2650 g for 112 kN of dynamic capacity — about 24 g per rated kN. At the printed limiting speed of 5,300 r/min the mean pitch diameter dm ≈ 87.5 mm implies a dn value around 464k mm·r/min; only the limiting speed is published for this execution. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 5,300 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "conveyor drum shafts",
      "fan and blower positions",
      "material-handling equipment"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "tilted mounting that loads one double row more heavily than the other",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Never wash 3311-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "The capped speed ceiling is 5,300 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "Open 3311 and capped 3311-A-2Z share the 55×120×49.2 mm envelope and 112/81.5 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Never wash 3311-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3311 A-2Z as the double shielded execution; the other order numbers of the 3311 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3311-A-2Z?",
        "a": "3311 A-2Z measures 55 mm bore × 120 mm OD × 49.2 mm width (2.165 × 4.724 × 1.937 in), mass about 2650 g. SKF 17000 ratings: C 112 kN, C0 81.5 kN, Pu 3.45 kN, SKF publishes only the 5,300 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What loads can 3311-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3311: C 112 kN, C0 81.5 kN, Pu 3.45 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3311-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3311-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (112/81.5 kN vs 95.6/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (112/81.5 kN vs 111/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×49.2 mm envelope with catalogue ratings within 10 %; 3311 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3311-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×49.2 mm envelope with catalogue ratings within 10 %; 3311 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3311-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×49.2 mm envelope with catalogue ratings within 10 %; 3311 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3311-A-2Z",
      "3311 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3311-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3311 A-2RS1",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 49.2,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 112,
    "static_load_kN": 81.5,
    "fatigue_load_limit_kN": 3.45,
    "limiting_speed_rpm": 3800,
    "max_rpm": 3800,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3311 A-2RS1 is the capped double-row angular-contact ball bearing for a 55 mm shaft, 55×120×49.2 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 55×120×49.2 mm (2.165×4.724×1.937 in), 32.5 mm radial section height, C 112 kN, C0 81.5 kN, Pu 3.45 kN.SKF publishes only the 3,800 r/min limiting speed for this execution, catalogue mass 2650 g. Selection figures for 3311 A-2RS1: the static-to-dynamic ratio C0/C is 0.73, Pu 3.45 kN is about 3 % of C, and catalogue mass works out to roughly 48 g per millimetre of bore. Envelope economics: the 49.2 mm width over a 32.5 mm section yields 1.51 mm of ring width per section millimetre, and the bearing weighs 2650 g for 112 kN of dynamic capacity — about 24 g per rated kN. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 3,800 r/min limiting value is the single published ceiling. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "conveyor drum shafts",
      "fan and blower positions",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "tilted mounting that loads one double row more heavily than the other",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Fit and fillet rules are unchanged from the open double-row 3311: k5 on a 55 mm rotating shaft, radii clearing the chamfer.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Open 3311 and capped 3311-A-2RS1 share the 55×120×49.2 mm envelope and 112/81.5 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "The contact NBR seals add drag and a lower speed ceiling: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3311 A-2RS1 as the double contactsealed execution; the other order numbers of the 3311 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3311-A-2RS1?",
        "a": "3311 A-2RS1 measures 55 mm bore × 120 mm OD × 49.2 mm width (2.165 × 4.724 × 1.937 in), mass about 2650 g. SKF 17000 ratings: C 112 kN, C0 81.5 kN, Pu 3.45 kN, SKF publishes only the 3,800 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "What is the difference between 3311 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3311?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3311-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (112/81.5 kN vs 95.6/83 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-DMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×49.2 mm envelope, but catalogue C/C0 differ between executions (112/81.5 kN vs 111/100 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3311-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×49.2 mm envelope with catalogue ratings within 10 %; 3311 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3311-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×49.2 mm envelope with catalogue ratings within 10 %; 3311 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3311-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×49.2 mm envelope with catalogue ratings within 10 %; 3311 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3311-A-2RS1",
      "3311 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3212-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3212 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 36.5,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 58.5,
    "fatigue_load_limit_kN": 2.5,
    "limiting_speed_rpm": 5600,
    "max_rpm": 5600,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3212 A-2Z is the capped double-row angular-contact ball bearing for a 60 mm shaft, 60×110×36.5 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 60×110×36.5 mm (2.362×4.331×1.437 in), 25.0 mm radial section height, C 73.5 kN, C0 58.5 kN, Pu 2.5 kN.SKF publishes only the 5,600 r/min limiting speed for this execution, catalogue mass 1200 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 5,600 r/min and no separate thermal reference is published; at dm ≈ 85.0 mm the corresponding dn is approximately 476k mm·r/min. Envelope economics: the 36.5 mm width over a 25.0 mm section yields 1.46 mm of ring width per section millimetre, and the bearing weighs 1200 g for 73.5 kN of dynamic capacity — about 16 g per rated kN. Bore-to-OD planning: OD 110 over bore 60 is a 1.83× step for this size, and the 36.5 mm width gives a bore/width ratio of 1.64; use these ratios when housing space around the 60 mm shaft is the first constraint. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "crusher auxiliary drives",
      "sealed-for-life process-side gear shafts",
      "agricultural and construction machinery drives"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The capped speed ceiling is 5,600 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "Never wash 3212-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3212 A-2Z as the double shielded execution; the other order numbers of the 3212 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3212-A-2Z?",
        "a": "3212 A-2Z measures 60 mm bore × 110 mm OD × 36.5 mm width (2.362 × 4.331 × 1.437 in), mass about 1200 g. SKF 17000 ratings: C 73.5 kN, C0 58.5 kN, Pu 2.5 kN, SKF publishes only the 5,600 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What is the difference between 3212 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3212?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3212-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3212-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3212-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3212-A-2Z",
      "3212 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3212-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3212 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 36.5,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 58.5,
    "fatigue_load_limit_kN": 2.5,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3212 A-2RS1 is the capped double-row angular-contact ball bearing for a 60 mm shaft, 60×110×36.5 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 60×110×36.5 mm (2.362×4.331×1.437 in), 25.0 mm radial section height, C 73.5 kN, C0 58.5 kN, Pu 2.5 kN.SKF publishes only the 4,000 r/min limiting speed for this execution, catalogue mass 1200 g. At the printed limiting speed of 4,000 r/min the mean pitch diameter dm ≈ 85.0 mm implies a dn value around 340k mm·r/min; only the limiting speed is published for this execution. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,000 r/min and no separate thermal reference is published; at dm ≈ 85.0 mm the corresponding dn is approximately 340k mm·r/min. Bore-to-OD planning: OD 110 over bore 60 is a 1.83× step for this size, and the 36.5 mm width gives a bore/width ratio of 1.64; use these ratios when housing space around the 60 mm shaft is the first constraint. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "agricultural and construction machinery drives",
      "conveyor pulleys in dusty duty",
      "crusher auxiliary drives"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "edge loading from shaft deflection or housing misalignment",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Never wash 3212-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "The capped speed ceiling is 4,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "The capped speed ceiling is 4,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "Never wash 3212-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3212 A-2RS1 as the double contactsealed execution; the other order numbers of the 3212 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3212-A-2RS1?",
        "a": "3212 A-2RS1 measures 60 mm bore × 110 mm OD × 36.5 mm width (2.362 × 4.331 × 1.437 in), mass about 1200 g. SKF 17000 ratings: C 73.5 kN, C0 58.5 kN, Pu 2.5 kN, SKF publishes only the 4,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "What loads can 3212-A-2RS1 take?",
        "a": "The same bidirectional combined loads as the open double-row 3212: C 73.5 kN, C0 58.5 kN, Pu 2.5 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3212-A-2RS1 sealed for life?",
        "a": "Yes — the two -2RS1 contact NBR seals enclose a lifetime grease fill; there is no relubrication provision, and the seals cap the limiting speed at 4,000 r/min."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3212-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3212-ATN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 ATN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3212-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×36.5 mm envelope with catalogue ratings within 10 %; 3212 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3212-A-2RS1",
      "3212 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3312-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3312 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 54,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 127,
    "static_load_kN": 95,
    "fatigue_load_limit_kN": 4.05,
    "limiting_speed_rpm": 5000,
    "max_rpm": 5000,
    "weight_g": 2800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3312 A-2Z is the capped double-row angular-contact ball bearing for a 60 mm shaft, 60×130×54 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 60×130×54 mm (2.362×5.118×2.126 in), 35.0 mm radial section height, C 127 kN, C0 95 kN, Pu 4.05 kN.SKF publishes only the 5,000 r/min limiting speed for this execution, catalogue mass 2800 g. Load balance: C0 95 kN against C 127 kN gives a 0.75 ratio, typical of a steep-angle axial-oriented design; Pu 4.05 kN enters the SKF adjusted-life equation rather than the basic rating life. The 4.05 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 127/95 kN ratings and 2800 g mass this execution carries about 2.12 kN of C per millimetre of bore. Bore-to-OD planning: OD 130 over bore 60 is a 2.17× step for this size, and the 54 mm width gives a bore/width ratio of 1.11; use these ratios when housing space around the 60 mm shaft is the first constraint. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "conveyor pulleys in dusty duty",
      "crusher auxiliary drives",
      "sealed-for-life process-side gear shafts"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "false brinelling on the loaded row while the shaft stands idle under vibration",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "Never wash 3312-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Fit and fillet rules are unchanged from the open double-row 3312: k5 on a 60 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3312 A-2Z as the double shielded execution; the other order numbers of the 3312 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3312-A-2Z?",
        "a": "3312 A-2Z measures 60 mm bore × 130 mm OD × 54 mm width (2.362 × 5.118 × 2.126 in), mass about 2800 g. SKF 17000 ratings: C 127 kN, C0 95 kN, Pu 4.05 kN, SKF publishes only the 5,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Is 3312-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      },
      {
        "q": "What is the difference between 3312 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3312-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×54 mm envelope with catalogue ratings within 10 %; 3312 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3312-A-2Z",
      "3312 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3213-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3213 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 38.1,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 80.6,
    "static_load_kN": 73.5,
    "fatigue_load_limit_kN": 3.1,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3213 A-2Z is the capped double-row angular-contact ball bearing for a 65 mm shaft, 65×120×38.1 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 65×120×38.1 mm (2.559×4.724×1.5 in), 27.5 mm radial section height, C 80.6 kN, C0 73.5 kN, Pu 3.1 kN.SKF publishes only the 4,800 r/min limiting speed for this execution, catalogue mass 1750 g. Mass and section check: 1750 g inside the 65×120×38.1 mm outline leaves a 27.5 mm radial section, and the 73.5 kN static rating is 0.91× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Sizing arithmetic on the 65 mm bore: 80.6 kN C divided by the 27.5 mm radial section height gives 2.9 kN per section millimetre; the 1750 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 120 over bore 65 is a 1.85× step for this size, and the 38.1 mm width gives a bore/width ratio of 1.71; use these ratios when housing space around the 65 mm shaft is the first constraint. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "conveyor pulleys in dusty duty",
      "crusher auxiliary drives",
      "sealed-for-life process-side gear shafts"
    ],
    "failure_modes": [
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The shields/seals do not make the bearing waterproof under immersion or pressure washing; select external sealing for wet or wash-down duty.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Never wash 3213-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Never wash 3213-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3213 A-2Z as the double shielded execution; the other order numbers of the 3213 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3213-A-2Z?",
        "a": "3213 A-2Z measures 65 mm bore × 120 mm OD × 38.1 mm width (2.559 × 4.724 × 1.5 in), mass about 1750 g. SKF 17000 ratings: C 80.6 kN, C0 73.5 kN, Pu 3.1 kN, SKF publishes only the 4,800 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Is 3213-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      },
      {
        "q": "What is the difference between 3213 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3213-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×38.1 mm envelope with catalogue ratings within 10 %; 3213 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3213-A-2RS1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×38.1 mm envelope with catalogue ratings within 10 %; 3213 A-2RS1 is the stamped steel cage, contact NBR seals (-2RS1) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3213-A-2Z",
      "3213 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3213-A-2RS1",
    "brand": "SKF",
    "manufacturer_designation": "3213 A-2RS1",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 38.1,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 80.6,
    "static_load_kN": 73.5,
    "fatigue_load_limit_kN": 3.1,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3213 A-2RS1 is the capped double-row angular-contact ball bearing for a 65 mm shaft, 65×120×38.1 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling. Envelope 65×120×38.1 mm (2.559×4.724×1.5 in), 27.5 mm radial section height, C 80.6 kN, C0 73.5 kN, Pu 3.1 kN.SKF publishes only the 3,600 r/min limiting speed for this execution, catalogue mass 1750 g. The 3.1 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 80.6/73.5 kN ratings and 1750 g mass this execution carries about 1.24 kN of C per millimetre of bore. Selection figures for 3213 A-2RS1: the static-to-dynamic ratio C0/C is 0.91, Pu 3.1 kN is about 4 % of C, and catalogue mass works out to roughly 27 g per millimetre of bore. Bore-to-OD planning: OD 120 over bore 65 is a 1.85× step for this size, and the 38.1 mm width gives a bore/width ratio of 1.71; use these ratios when housing space around the 65 mm shaft is the first constraint. Contact-seal execution note: the two NBR -2RS1 lips ride the inner-ring lands, sealing the factory grease against moisture and fine dust; the lips add running torque and set the lower limiting speed printed for this size, and the sealed cavity is maintenance-free by design (no relubrication path). The A-2Z shielded order number is the low-drag alternative for cleaner positions.",
    "applications": [
      "conveyor pulleys in dusty duty",
      "crusher auxiliary drives",
      "sealed-for-life process-side gear shafts"
    ],
    "failure_modes": [
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "seal-lip wear and grease loss after fine abrasive dust reaches the lip contact",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "raceway staining from water in the lubricant during idle periods",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The capped speed ceiling is 3,600 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2RS1.",
      "Never wash 3213-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Never wash 3213-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Never wash 3213-A-2RS1 in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3213 A-2RS1 as the double contactsealed execution; the other order numbers of the 3213 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3213-A-2RS1?",
        "a": "3213 A-2RS1 measures 65 mm bore × 120 mm OD × 38.1 mm width (2.559 × 4.724 × 1.5 in), mass about 1750 g. SKF 17000 ratings: C 80.6 kN, C0 73.5 kN, Pu 3.1 kN, SKF publishes only the 3,600 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2RS1 suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2RS1 marks a contact NBR elastomer seal on each side, riding the inner ring: better fine-dust and moisture protection than a shield at the cost of seal drag and a lower speed ceiling."
      },
      {
        "q": "Is 3213-A-2RS1 sealed for life?",
        "a": "Yes — the two -2RS1 contact NBR seals enclose a lifetime grease fill; there is no relubrication provision, and the seals cap the limiting speed at 3,600 r/min."
      },
      {
        "q": "What is the difference between 3213 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3213-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×38.1 mm envelope with catalogue ratings within 10 %; 3213 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "3213-A-2Z",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×38.1 mm envelope with catalogue ratings within 10 %; 3213 A-2Z is the stamped steel cage, shields (-2Z) execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3213-A-2RS1",
      "3213 A-2RS1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3313-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3313 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 58.7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 146,
    "static_load_kN": 110,
    "fatigue_load_limit_kN": 4.55,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 4100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3313 A-2Z is the capped double-row angular-contact ball bearing for a 65 mm shaft, 65×140×58.7 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 65×140×58.7 mm (2.559×5.512×2.311 in), 37.5 mm radial section height, C 146 kN, C0 110 kN, Pu 4.55 kN.SKF publishes only the 4,500 r/min limiting speed for this execution, catalogue mass 4100 g. At the printed limiting speed of 4,500 r/min the mean pitch diameter dm ≈ 102.5 mm implies a dn value around 461k mm·r/min; only the limiting speed is published for this execution. Selection figures for 3313 A-2Z: the static-to-dynamic ratio C0/C is 0.75, Pu 4.55 kN is about 3 % of C, and catalogue mass works out to roughly 63 g per millimetre of bore. Bore-to-OD planning: OD 140 over bore 65 is a 2.15× step for this size, and the 58.7 mm width gives a bore/width ratio of 1.11; use these ratios when housing space around the 65 mm shaft is the first constraint. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "crusher auxiliary drives",
      "sealed-for-life process-side gear shafts",
      "agricultural and construction machinery drives"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "edge loading from shaft deflection or housing misalignment",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Open 3313 and capped 3313-A-2Z share the 65×140×58.7 mm envelope and 146/110 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Open 3313 and capped 3313-A-2Z share the 65×140×58.7 mm envelope and 146/110 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Fit and fillet rules are unchanged from the open double-row 3313: k5 on a 65 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3313 A-2Z as the double shielded execution; the other order numbers of the 3313 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3313-A-2Z?",
        "a": "3313 A-2Z measures 65 mm bore × 140 mm OD × 58.7 mm width (2.559 × 5.512 × 2.311 in), mass about 4100 g. SKF 17000 ratings: C 146 kN, C0 110 kN, Pu 4.55 kN, SKF publishes only the 4,500 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What is the difference between 3313 A-2Z and A-2RS1?",
        "a": "Both share the double-row A geometry, dimensions and ratings; A-2Z uses non-contact metal shields (lower drag, higher speed, dust protection), A-2RS1 uses contact NBR rubber seals (better moisture and fine-dust protection, lower speed ceiling and more drag)."
      },
      {
        "q": "Can I wash or repack a capped 3313?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3313-DNRCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×58.7 mm envelope, but catalogue C/C0 differ between executions (146/110 kN vs 138/122 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "3313-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×58.7 mm envelope with catalogue ratings within 10 %; 3313 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3313-A-2Z",
      "3313 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3214-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3214 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 39.7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 88.4,
    "static_load_kN": 80,
    "fatigue_load_limit_kN": 3.4,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3214 A-2Z is the capped double-row angular-contact ball bearing for a 70 mm shaft, 70×125×39.7 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 70×125×39.7 mm (2.756×4.921×1.563 in), 27.5 mm radial section height, C 88.4 kN, C0 80 kN, Pu 3.4 kN.SKF publishes only the 4,500 r/min limiting speed for this execution, catalogue mass 1900 g. Envelope economics: the 39.7 mm width over a 27.5 mm section yields 1.44 mm of ring width per section millimetre, and the bearing weighs 1900 g for 88.4 kN of dynamic capacity — about 21 g per rated kN. At the printed limiting speed of 4,500 r/min the mean pitch diameter dm ≈ 97.5 mm implies a dn value around 439k mm·r/min; only the limiting speed is published for this execution. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 4,500 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "agricultural and construction machinery drives",
      "conveyor pulleys in dusty duty",
      "crusher auxiliary drives"
    ],
    "failure_modes": [
      "contact-seal lip hardening and grease-life expiry after long high-temperature service",
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Never wash 3214-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "The capped speed ceiling is 4,500 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "Open 3214 and capped 3214-A-2Z share the 70×125×39.7 mm envelope and 88.4/80 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Never wash 3214-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3214 A-2Z as the double shielded execution; the other order numbers of the 3214 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3214-A-2Z?",
        "a": "3214 A-2Z measures 70 mm bore × 125 mm OD × 39.7 mm width (2.756 × 4.921 × 1.563 in), mass about 1900 g. SKF 17000 ratings: C 88.4 kN, C0 80 kN, Pu 3.4 kN, SKF publishes only the 4,500 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What loads can 3214-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3214: C 88.4 kN, C0 80 kN, Pu 3.4 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3214-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3214-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×39.7 mm envelope with catalogue ratings within 10 %; 3214 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3214-A-2Z",
      "3214 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3314-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3314 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 63.5,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 163,
    "static_load_kN": 125,
    "fatigue_load_limit_kN": 5,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "weight_g": 5050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3314 A-2Z is the capped double-row angular-contact ball bearing for a 70 mm shaft, 70×150×63.5 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 70×150×63.5 mm (2.756×5.906×2.5 in), 40.0 mm radial section height, C 163 kN, C0 125 kN, Pu 5 kN.SKF publishes only the 4,300 r/min limiting speed for this execution, catalogue mass 5050 g. Sizing arithmetic on the 70 mm bore: 163 kN C divided by the 40.0 mm radial section height gives 4.1 kN per section millimetre; the 5050 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Load balance: C0 125 kN against C 163 kN gives a 0.77 ratio, typical of a steep-angle axial-oriented design; Pu 5 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 4,300 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "sealed-for-life process-side gear shafts",
      "agricultural and construction machinery drives",
      "conveyor pulleys in dusty duty"
    ],
    "failure_modes": [
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "loss of controlled axial clearance (CB) after thermal growth removes residual play",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Open 3314 and capped 3314-A-2Z share the 70×150×63.5 mm envelope and 163/125 kN ratings — the choice is maintenance access and contamination, not capacity.",
      "Fit and fillet rules are unchanged from the open double-row 3314: k5 on a 70 mm rotating shaft, radii clearing the chamfer.",
      "Never wash 3314-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Never wash 3314-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3314 A-2Z as the double shielded execution; the other order numbers of the 3314 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3314-A-2Z?",
        "a": "3314 A-2Z measures 70 mm bore × 150 mm OD × 63.5 mm width (2.756 × 5.906 × 2.5 in), mass about 5050 g. SKF 17000 ratings: C 163 kN, C0 125 kN, Pu 5 kN, SKF publishes only the 4,300 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Can I wash or repack a capped 3314?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3314-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3314: C 163 kN, C0 125 kN, Pu 5 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3314-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×63.5 mm envelope with catalogue ratings within 10 %; 3314 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3314-A-2Z",
      "3314 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3215-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3215 A-2Z",
    "series": "3200-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 41.3,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 95.6,
    "static_load_kN": 88,
    "fatigue_load_limit_kN": 3.75,
    "limiting_speed_rpm": 4500,
    "max_rpm": 4500,
    "weight_g": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3215 A-2Z is the capped double-row angular-contact ball bearing for a 75 mm shaft, 75×130×41.3 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 75×130×41.3 mm (2.953×5.118×1.626 in), 27.5 mm radial section height, C 95.6 kN, C0 88 kN, Pu 3.75 kN.SKF publishes only the 4,500 r/min limiting speed for this execution, catalogue mass 2100 g. The 3.75 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 95.6/88 kN ratings and 2100 g mass this execution carries about 1.27 kN of C per millimetre of bore. Mass and section check: 2100 g inside the 75×130×41.3 mm outline leaves a 27.5 mm radial section, and the 88 kN static rating is 0.92× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 4,500 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "sealed-for-life process-side gear shafts",
      "agricultural and construction machinery drives",
      "conveyor pulleys in dusty duty"
    ],
    "failure_modes": [
      "grease loss when the sealed-for-life cavity is overheated with no relubrication path",
      "contamination trapped for life when a capped bearing is mounted with dirty hands or tools",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "two-direction thrust overload concentrating load on one row and spalling its raceway",
      "raceway staining from water in the lubricant during idle periods",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "The capped speed ceiling is 4,500 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Never wash 3215-A-2Z in solvent: the lifetime grease fill cannot be replaced once flushed out.",
      "The non-contact shields cap the speed with negligible drag: no relubrication is provided for, so mounting cleanliness decides much of the real grease life.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3215 A-2Z as the double shielded execution; the other order numbers of the 3215 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3215-A-2Z?",
        "a": "3215 A-2Z measures 75 mm bore × 130 mm OD × 41.3 mm width (2.953 × 5.118 × 1.626 in), mass about 2100 g. SKF 17000 ratings: C 95.6 kN, C0 88 kN, Pu 3.75 kN, SKF publishes only the 4,500 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "Can I wash or repack a capped 3215?",
        "a": "No — solvent flushes the factory grease with no way to replace it fully; keep the original protection in place and mount the bearing with clean tools."
      },
      {
        "q": "What loads can 3215-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3215: C 95.6 kN, C0 88 kN, Pu 3.75 kN. Capping changes sealing and speed, not the basic ratings."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3215-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×41.3 mm envelope with catalogue ratings within 10 %; 3215 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3215-A-2Z",
      "3215 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "3315-A-2Z",
    "brand": "SKF",
    "manufacturer_designation": "3315 A-2Z",
    "series": "3300-series",
    "type": "angular_contact",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 68.3,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 176,
    "static_load_kN": 140,
    "fatigue_load_limit_kN": 5.5,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "weight_g": 5600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "3315 A-2Z is the capped double-row angular-contact ball bearing for a 75 mm shaft, 75×160×68.3 mm, greased and sealed (or shielded) for life at the SKF works. A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance. Envelope 75×160×68.3 mm (2.953×6.299×2.689 in), 42.5 mm radial section height, C 176 kN, C0 140 kN, Pu 5.5 kN.SKF publishes only the 4,000 r/min limiting speed for this execution, catalogue mass 5600 g. Selection figures for 3315 A-2Z: the static-to-dynamic ratio C0/C is 0.80, Pu 5.5 kN is about 3 % of C, and catalogue mass works out to roughly 75 g per millimetre of bore. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,000 r/min and no separate thermal reference is published; at dm ≈ 117.5 mm the corresponding dn is approximately 470k mm·r/min. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 4,000 r/min limiting value is the single published ceiling. Shielded execution note: the two sheet-metal -2Z covers clip into the outer ring without contacting the inner ring, giving grease retention and coarse-dust protection at virtually no friction; the cavity is factory-greased and the shield arrangement suits dry, moderately dusty positions rather than wash-down duty, where the A-2RS1 contact-seal order number is the alternative.",
    "applications": [
      "agricultural and construction machinery drives",
      "conveyor pulleys in dusty duty",
      "crusher auxiliary drives"
    ],
    "failure_modes": [
      "fine dust or moisture bypassing a worn 2RS1 lip in dirty or wet duty",
      "shield rubbing after misalignment or overheating of a 2Z execution",
      "grease escape past the non-contact shields in an overfilled or vertically mounted position",
      "tilted mounting that loads one double row more heavily than the other",
      "brinelling from pressing the ring home through the balls or from static overload",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Fit and fillet rules are unchanged from the open double-row 3315: k5 on a 75 mm rotating shaft, radii clearing the chamfer.",
      "The capped speed ceiling is 4,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "The capped speed ceiling is 4,000 r/min — seal drag and grease life govern, which is why SKF publishes no thermal reference speed for A-2Z.",
      "Fit and fillet rules are unchanged from the open double-row 3315: k5 on a 75 mm rotating shaft, radii clearing the chamfer.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for 3315 A-2Z as the double shielded execution; the other order numbers of the 3315 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 3315-A-2Z?",
        "a": "3315 A-2Z measures 75 mm bore × 160 mm OD × 68.3 mm width (2.953 × 6.299 × 2.689 in), mass about 5600 g. SKF 17000 ratings: C 176 kN, C0 140 kN, Pu 5.5 kN, SKF publishes only the 4,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the A-2Z suffix mean?",
        "a": "A on this double-row bearing means no filling slots, so both ball rows retain their full complement. -2Z marks a sheet-metal shield on each side: non-contacting, grease-retention and dust protection with negligible drag, the bearing remaining open-style relubricatable only through the shield clearance."
      },
      {
        "q": "What loads can 3315-A-2Z take?",
        "a": "The same bidirectional combined loads as the open double-row 3315: C 176 kN, C0 140 kN, Pu 5.5 kN. Capping changes sealing and speed, not the basic ratings."
      },
      {
        "q": "Is 3315-A-2Z sealed for life?",
        "a": "It is shielded on both sides (-2Z) and delivered filled with the appropriate SKF grease; the non-contact shields give low-drag grease retention and dust protection, but the arrangement is not a contact-sealed cavity."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "3315-A",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×68.3 mm envelope with catalogue ratings within 10 %; 3315 A is the stamped steel cage, open arrangement execution of this size — boundary dimensions interchangeable, execution differs."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "3315-A-2Z",
      "3315 A-2Z"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-202-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 202 N2MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 12.7,
    "static_load_kN": 8.3,
    "fatigue_load_limit_kN": 0.355,
    "limiting_speed_rpm": 36000,
    "max_rpm": 36000,
    "weight_g": 62,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 202 N2MA is SKF's 15 mm-bore QJ four-point contact ball bearing of the QJ200 series, 15×35×11 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 15×35×11 mm (0.591×1.378×0.433 in), 10.0 mm radial section height, C 12.7 kN, C0 8.3 kN, Pu 0.355 kN.SKF publishes only the 36,000 r/min limiting speed for this execution, catalogue mass 62 g. Sizing arithmetic on the 15 mm bore: 12.7 kN C divided by the 10.0 mm radial section height gives 1.3 kN per section millimetre; the 62 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 11 mm width over a 10.0 mm section yields 1.10 mm of ring width per section millimetre, and the bearing weighs 62 g for 12.7 kN of dynamic capacity — about 5 g per rated kN. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 36,000 r/min limiting value is the single published ceiling. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "compact thrust-carrying positions paired with a deep-groove radial bearing",
      "gear selector and indexing mechanisms",
      "small screw and cam drives"
    ],
    "failure_modes": [
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Anti-rotation is built into QJ-202-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-202-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 202 N2MA as the qj slotted execution; the other order numbers of the QJ 202 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-202-N2MA?",
        "a": "QJ 202 N2MA measures 15 mm bore × 35 mm OD × 11 mm width (0.591 × 1.378 × 0.433 in), mass about 62 g. SKF 17000 ratings: C 12.7 kN, C0 8.3 kN, Pu 0.355 kN, SKF publishes only the 36,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      },
      {
        "q": "What does QJ mean in QJ 202 N2MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7202-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (12.7/8.3 kN vs 8.32/4.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7202-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (12.7/8.3 kN vs 8.32/4.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7202-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (12.7/8.3 kN vs 8.8/4.65 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7202-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope, but catalogue C/C0 differ between executions (12.7/8.3 kN vs 10.2/5.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7202",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7202 BEP shares the 15×35×11 mm angular-contact envelope, but catalogue C/C0 differ (12.7/8.3 kN vs 8.32/4.4 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-202-N2MA",
      "QJ 202 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-203-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 203 N2MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 17,
    "static_load_kN": 11.4,
    "fatigue_load_limit_kN": 0.48,
    "limiting_speed_rpm": 30000,
    "max_rpm": 30000,
    "weight_g": 82,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 203 N2MA is SKF's 17 mm-bore QJ four-point contact ball bearing of the QJ200 series, 17×40×12 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 17×40×12 mm (0.669×1.575×0.472 in), 11.5 mm radial section height, C 17 kN, C0 11.4 kN, Pu 0.48 kN.SKF publishes only the 30,000 r/min limiting speed for this execution, catalogue mass 82 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 30,000 r/min and no separate thermal reference is published; at dm ≈ 28.5 mm the corresponding dn is approximately 855k mm·r/min. At the printed limiting speed of 30,000 r/min the mean pitch diameter dm ≈ 28.5 mm implies a dn value around 855k mm·r/min; only the limiting speed is published for this execution. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 30,000 r/min limiting value is the single published ceiling. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "gear selector and indexing mechanisms",
      "small screw and cam drives",
      "compact thrust-carrying positions paired with a deep-groove radial bearing"
    ],
    "failure_modes": [
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "outer-ring creep and seat fretting where a N2-locating-slot bearing is not positively stopped",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Engage the N2 slots with housing dogs at assembly — a radially loose outer ring without positive anti-rotation creeps its seat",
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "Anti-rotation is built into QJ-203-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-203-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 203 N2MA as the qj slotted execution; the other order numbers of the QJ 203 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-203-N2MA?",
        "a": "QJ 203 N2MA measures 17 mm bore × 40 mm OD × 12 mm width (0.669 × 1.575 × 0.472 in), mass about 82 g. SKF 17000 ratings: C 17 kN, C0 11.4 kN, Pu 0.48 kN, SKF publishes only the 30,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What minimum axial load does QJ-203-N2MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7203-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (17/11.4 kN vs 10.4/5.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (17/11.4 kN vs 10.4/5.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (17/11.4 kN vs 11/5.85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (17/11.4 kN vs 11/5.85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-BEY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (17/11.4 kN vs 11.1/6.1 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope, but catalogue C/C0 differ between executions (17/11.4 kN vs 12.5/6.7 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7203",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7203 BEP shares the 17×40×12 mm angular-contact envelope, but catalogue C/C0 differ (17/11.4 kN vs 10.4/5.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-203-N2MA",
      "QJ 203 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-303-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 303 N2MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 23.4,
    "static_load_kN": 15,
    "fatigue_load_limit_kN": 0.64,
    "limiting_speed_rpm": 28000,
    "max_rpm": 28000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 303 N2MA is SKF's 17 mm-bore QJ four-point contact ball bearing of the QJ300 series, 17×47×14 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 17×47×14 mm (0.669×1.85×0.551 in), 15.0 mm radial section height, C 23.4 kN, C0 15 kN, Pu 0.64 kN.SKF publishes only the 28,000 r/min limiting speed for this execution, catalogue mass 140 g. Sizing arithmetic on the 17 mm bore: 23.4 kN C divided by the 15.0 mm radial section height gives 1.6 kN per section millimetre; the 140 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Envelope economics: the 14 mm width over a 15.0 mm section yields 0.93 mm of ring width per section millimetre, and the bearing weighs 140 g for 23.4 kN of dynamic capacity — about 6 g per rated kN. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 28,000 r/min limiting value is the single published ceiling. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "gear selector and indexing mechanisms",
      "small screw and cam drives",
      "compact thrust-carrying positions paired with a deep-groove radial bearing"
    ],
    "failure_modes": [
      "outer-ring creep and seat fretting where a N2-locating-slot bearing is not positively stopped",
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Anti-rotation is built into QJ-303-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-303-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 303 N2MA as the qj slotted execution; the other order numbers of the QJ 303 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-303-N2MA?",
        "a": "QJ 303 N2MA measures 17 mm bore × 47 mm OD × 14 mm width (0.669 × 1.85 × 0.551 in), mass about 140 g. SKF 17000 ratings: C 23.4 kN, C0 15 kN, Pu 0.64 kN, SKF publishes only the 28,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      },
      {
        "q": "What does QJ mean in QJ 303 N2MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7303-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope, but catalogue C/C0 differ between executions (23.4/15 kN vs 15.9/8.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7303-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope, but catalogue C/C0 differ between executions (23.4/15 kN vs 15.9/8.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7303-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope, but catalogue C/C0 differ between executions (23.4/15 kN vs 15.9/8.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7303",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7303 BEP shares the 17×47×14 mm angular-contact envelope, but catalogue C/C0 differ (23.4/15 kN vs 15.9/8.3 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-303-N2MA",
      "QJ 303 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-304-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 304 N2MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 32,
    "static_load_kN": 21.6,
    "fatigue_load_limit_kN": 0.93,
    "limiting_speed_rpm": 24000,
    "max_rpm": 24000,
    "weight_g": 180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 304 N2MA is SKF's 20 mm-bore QJ four-point contact ball bearing of the QJ300 series, 20×52×15 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 20×52×15 mm (0.787×2.047×0.591 in), 16.0 mm radial section height, C 32 kN, C0 21.6 kN, Pu 0.93 kN.SKF publishes only the 24,000 r/min limiting speed for this execution, catalogue mass 180 g. Selection figures for QJ 304 N2MA: the static-to-dynamic ratio C0/C is 0.68, Pu 0.93 kN is about 3 % of C, and catalogue mass works out to roughly 9 g per millimetre of bore. Envelope economics: the 15 mm width over a 16.0 mm section yields 0.94 mm of ring width per section millimetre, and the bearing weighs 180 g for 32 kN of dynamic capacity — about 6 g per rated kN. Bore-to-OD planning: OD 52 over bore 20 is a 2.60× step for this size, and the 15 mm width gives a bore/width ratio of 1.33; use these ratios when housing space around the 20 mm shaft is the first constraint. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "compact thrust-carrying positions paired with a deep-groove radial bearing",
      "gear selector and indexing mechanisms",
      "small screw and cam drives"
    ],
    "failure_modes": [
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "outer-ring creep and seat fretting where a N2-locating-slot bearing is not positively stopped",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "brinelling from pressing the ring home through the balls or from static overload",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Anti-rotation is built into QJ-304-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-304-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 304 N2MA as the qj slotted execution; the other order numbers of the QJ 304 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-304-N2MA?",
        "a": "QJ 304 N2MA measures 20 mm bore × 52 mm OD × 15 mm width (0.787 × 2.047 × 0.591 in), mass about 180 g. SKF 17000 ratings: C 32 kN, C0 21.6 kN, Pu 0.93 kN, SKF publishes only the 24,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What does QJ mean in QJ 304 N2MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7304-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 17.4/9.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 17.4/9.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 20.4/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 20.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; QJ 304 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-304-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; QJ 304 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7304 BEP shares the 20×52×15 mm angular-contact envelope, but catalogue C/C0 differ (32/21.6 kN vs 17.4/9.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-304-N2MA",
      "QJ 304 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-304-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 304 MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 32,
    "static_load_kN": 21.6,
    "fatigue_load_limit_kN": 0.93,
    "limiting_speed_rpm": 24000,
    "max_rpm": 24000,
    "weight_g": 180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 304 MA is SKF's 20 mm-bore QJ four-point contact ball bearing of the QJ300 series, 20×52×15 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 20×52×15 mm (0.787×2.047×0.591 in), 16.0 mm radial section height, C 32 kN, C0 21.6 kN, Pu 0.93 kN.SKF publishes only the 24,000 r/min limiting speed for this execution, catalogue mass 180 g. Sizing arithmetic on the 20 mm bore: 32 kN C divided by the 16.0 mm radial section height gives 2.0 kN per section millimetre; the 180 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. The 0.93 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 32/21.6 kN ratings and 180 g mass this execution carries about 1.60 kN of C per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 24,000 r/min limiting value is the single published ceiling. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "small screw and cam drives",
      "compact thrust-carrying positions paired with a deep-groove radial bearing",
      "gear selector and indexing mechanisms"
    ],
    "failure_modes": [
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "Anti-rotation is NOT built into QJ-304-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-304-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 304 MA as the qj plain execution; the other order numbers of the QJ 304 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-304-MA?",
        "a": "QJ 304 MA measures 20 mm bore × 52 mm OD × 15 mm width (0.787 × 2.047 × 0.591 in), mass about 180 g. SKF 17000 ratings: C 32 kN, C0 21.6 kN, Pu 0.93 kN, SKF publishes only the 24,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      },
      {
        "q": "What does QJ mean in QJ 304 MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7304-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 17.4/9.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 17.4/9.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 20.4/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 20.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; QJ 304 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-304-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; QJ 304 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7304 BEP shares the 20×52×15 mm angular-contact envelope, but catalogue C/C0 differ (32/21.6 kN vs 17.4/9.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-304-MA",
      "QJ 304 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-304-N2PHAS",
    "brand": "SKF",
    "manufacturer_designation": "QJ 304 N2PHAS",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 32,
    "static_load_kN": 21.6,
    "fatigue_load_limit_kN": 0.93,
    "limiting_speed_rpm": 24000,
    "max_rpm": 24000,
    "weight_g": 180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 304 N2PHAS is SKF's 20 mm-bore QJ four-point contact ball bearing of the QJ300 series, 20×52×15 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication. Envelope 20×52×15 mm (0.787×2.047×0.591 in), 16.0 mm radial section height, C 32 kN, C0 21.6 kN, Pu 0.93 kN.SKF publishes only the 24,000 r/min limiting speed for this execution, catalogue mass 180 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 24,000 r/min and no separate thermal reference is published; at dm ≈ 36.0 mm the corresponding dn is approximately 864k mm·r/min. Sizing arithmetic on the 20 mm bore: 32 kN C divided by the 16.0 mm radial section height gives 2.0 kN per section millimetre; the 180 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 24,000 r/min limiting value is the single published ceiling. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "small screw and cam drives",
      "compact thrust-carrying positions paired with a deep-groove radial bearing",
      "gear selector and indexing mechanisms"
    ],
    "failure_modes": [
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "The PHAS PEEK outer-ring-centred cage with lubrication grooves suits the highest speeds with oil-air lubrication",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Anti-rotation is built into QJ-304-N2PHAS: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The PHAS PEEK cage of QJ-304-N2PHAS is outer-ring-centred with lubrication grooves: feed clean oil-air or appropriate grease to the guide land and inspect groove filling at overhaul.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 304 N2PHAS as the qj slotted execution; the other order numbers of the QJ 304 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-304-N2PHAS?",
        "a": "QJ 304 N2PHAS measures 20 mm bore × 52 mm OD × 15 mm width (0.787 × 2.047 × 0.591 in), mass about 180 g. SKF 17000 ratings: C 32 kN, C0 21.6 kN, Pu 0.93 kN, SKF publishes only the 24,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2PHAS suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication."
      },
      {
        "q": "What minimum axial load does QJ-304-N2PHAS require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7304-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 17.4/9.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 17.4/9.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 19/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 20.4/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7304-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope, but catalogue C/C0 differ between executions (32/21.6 kN vs 20.8/11.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-304-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; QJ 304 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-304-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope with catalogue ratings within 10 %; QJ 304 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7304 BEP shares the 20×52×15 mm angular-contact envelope, but catalogue C/C0 differ (32/21.6 kN vs 17.4/9.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-304-N2PHAS",
      "QJ 304 N2PHAS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-205-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 205 N2MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 27,
    "static_load_kN": 21.2,
    "fatigue_load_limit_kN": 0.9,
    "limiting_speed_rpm": 22000,
    "max_rpm": 22000,
    "weight_g": 160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 205 N2MA is SKF's 25 mm-bore QJ four-point contact ball bearing of the QJ200 series, 25×52×15 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 25×52×15 mm (0.984×2.047×0.591 in), 13.5 mm radial section height, C 27 kN, C0 21.2 kN, Pu 0.9 kN.SKF publishes only the 22,000 r/min limiting speed for this execution, catalogue mass 160 g. Selection figures for QJ 205 N2MA: the static-to-dynamic ratio C0/C is 0.79, Pu 0.9 kN is about 3 % of C, and catalogue mass works out to roughly 6 g per millimetre of bore. Envelope economics: the 15 mm width over a 13.5 mm section yields 1.11 mm of ring width per section millimetre, and the bearing weighs 160 g for 27 kN of dynamic capacity — about 6 g per rated kN. Bore-to-OD planning: OD 52 over bore 25 is a 2.08× step for this size, and the 15 mm width gives a bore/width ratio of 1.67; use these ratios when housing space around the 25 mm shaft is the first constraint. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives",
      "pump thrust positions"
    ],
    "failure_modes": [
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "brinelling from pressing the ring home through the balls or from static overload",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Anti-rotation is built into QJ-205-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-205-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 205 N2MA as the qj slotted execution; the other order numbers of the QJ 205 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-205-N2MA?",
        "a": "QJ 205 N2MA measures 25 mm bore × 52 mm OD × 15 mm width (0.984 × 2.047 × 0.591 in), mass about 160 g. SKF 17000 ratings: C 27 kN, C0 21.2 kN, Pu 0.9 kN, SKF publishes only the 22,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What does QJ mean in QJ 205 N2MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7205-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (27/21.2 kN vs 14.8/9.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (27/21.2 kN vs 14.8/9.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-BEY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (27/21.2 kN vs 14.8/9.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (27/21.2 kN vs 15.6/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (27/21.2 kN vs 15.6/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (27/21.2 kN vs 15.6/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (27/21.2 kN vs 15.6/10 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope, but catalogue C/C0 differ between executions (27/21.2 kN vs 18/11.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7205 BEP shares the 25×52×15 mm angular-contact envelope, but catalogue C/C0 differ (27/21.2 kN vs 14.8/9.3 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-205-N2MA",
      "QJ 205 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-305-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 305 N2MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 42.5,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 1.27,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 305 N2MA is SKF's 25 mm-bore QJ four-point contact ball bearing of the QJ300 series, 25×62×17 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 25×62×17 mm (0.984×2.441×0.669 in), 18.5 mm radial section height, C 42.5 kN, C0 30 kN, Pu 1.27 kN.SKF publishes only the 20,000 r/min limiting speed for this execution, catalogue mass 290 g. Load balance: C0 30 kN against C 42.5 kN gives a 0.71 ratio, typical of a four-point thrust-oriented design; Pu 1.27 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 20,000 r/min and no separate thermal reference is published; at dm ≈ 43.5 mm the corresponding dn is approximately 870k mm·r/min. Bore-to-OD planning: OD 62 over bore 25 is a 2.48× step for this size, and the 17 mm width gives a bore/width ratio of 1.47; use these ratios when housing space around the 25 mm shaft is the first constraint. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives"
    ],
    "failure_modes": [
      "outer-ring creep and seat fretting where a N2-locating-slot bearing is not positively stopped",
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Anti-rotation is built into QJ-305-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-305-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 305 N2MA as the qj slotted execution; the other order numbers of the QJ 305 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-305-N2MA?",
        "a": "QJ 305 N2MA measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 290 g. SKF 17000 ratings: C 42.5 kN, C0 30 kN, Pu 1.27 kN, SKF publishes only the 20,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      },
      {
        "q": "What minimum axial load does QJ-305-N2MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7305-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 24.2/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 24.2/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BEY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 24.2/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 26.5/15.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 26.5/15.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 26.5/15.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 26.5/15.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 29/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; QJ 305 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7305 BEP shares the 25×62×17 mm angular-contact envelope, but catalogue C/C0 differ (42.5/30 kN vs 24.2/14 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-305-N2MA",
      "QJ 305 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-305-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 305 MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 42.5,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 1.27,
    "limiting_speed_rpm": 20000,
    "max_rpm": 20000,
    "weight_g": 290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 305 MA is SKF's 25 mm-bore QJ four-point contact ball bearing of the QJ300 series, 25×62×17 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 25×62×17 mm (0.984×2.441×0.669 in), 18.5 mm radial section height, C 42.5 kN, C0 30 kN, Pu 1.27 kN.SKF publishes only the 20,000 r/min limiting speed for this execution, catalogue mass 290 g. At the printed limiting speed of 20,000 r/min the mean pitch diameter dm ≈ 43.5 mm implies a dn value around 870k mm·r/min; only the limiting speed is published for this execution. The 1.27 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 42.5/30 kN ratings and 290 g mass this execution carries about 1.70 kN of C per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 20,000 r/min limiting value is the single published ceiling. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "screw and worm drives",
      "pump thrust positions",
      "clutch and brake assemblies"
    ],
    "failure_modes": [
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "edge loading from shaft deflection or housing misalignment",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Anti-rotation is NOT built into QJ-305-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-305-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 305 MA as the qj plain execution; the other order numbers of the QJ 305 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-305-MA?",
        "a": "QJ 305 MA measures 25 mm bore × 62 mm OD × 17 mm width (0.984 × 2.441 × 0.669 in), mass about 290 g. SKF 17000 ratings: C 42.5 kN, C0 30 kN, Pu 1.27 kN, SKF publishes only the 20,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What minimum axial load does QJ-305-MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7305-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 24.2/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 24.2/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BEY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 24.2/14 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 26.5/15.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 26.5/15.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 26.5/15.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 26.5/15.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7305-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope, but catalogue C/C0 differ between executions (42.5/30 kN vs 29/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-305-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope with catalogue ratings within 10 %; QJ 305 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7305 BEP shares the 25×62×17 mm angular-contact envelope, but catalogue C/C0 differ (42.5/30 kN vs 24.2/14 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-305-MA",
      "QJ 305 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-206-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 206 N2MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 37.5,
    "static_load_kN": 30.5,
    "fatigue_load_limit_kN": 1.29,
    "limiting_speed_rpm": 19000,
    "max_rpm": 19000,
    "weight_g": 240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 206 N2MA is SKF's 30 mm-bore QJ four-point contact ball bearing of the QJ200 series, 30×62×16 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 30×62×16 mm (1.181×2.441×0.63 in), 16.0 mm radial section height, C 37.5 kN, C0 30.5 kN, Pu 1.29 kN.SKF publishes only the 19,000 r/min limiting speed for this execution, catalogue mass 240 g. The 1.29 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 37.5/30.5 kN ratings and 240 g mass this execution carries about 1.25 kN of C per millimetre of bore. Selection figures for QJ 206 N2MA: the static-to-dynamic ratio C0/C is 0.81, Pu 1.29 kN is about 3 % of C, and catalogue mass works out to roughly 8 g per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 19,000 r/min limiting value is the single published ceiling. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives",
      "pump thrust positions"
    ],
    "failure_modes": [
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Anti-rotation is built into QJ-206-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-206-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 206 N2MA as the qj slotted execution; the other order numbers of the QJ 206 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-206-N2MA?",
        "a": "QJ 206 N2MA measures 30 mm bore × 62 mm OD × 16 mm width (1.181 × 2.441 × 0.63 in), mass about 240 g. SKF 17000 ratings: C 37.5 kN, C0 30.5 kN, Pu 1.29 kN, SKF publishes only the 19,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      },
      {
        "q": "What does QJ mean in QJ 206 N2MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7206-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 22.5/14.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 22.5/14.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 24/15.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 24/15.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 24/15.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 25.5/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 27.5/17.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; QJ 206 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7206 BEP shares the 30×62×16 mm angular-contact envelope, but catalogue C/C0 differ (37.5/30.5 kN vs 22.5/14.3 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-206-N2MA",
      "QJ 206 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-206-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 206 MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 37.5,
    "static_load_kN": 30.5,
    "fatigue_load_limit_kN": 1.29,
    "limiting_speed_rpm": 19000,
    "max_rpm": 19000,
    "weight_g": 240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 206 MA is SKF's 30 mm-bore QJ four-point contact ball bearing of the QJ200 series, 30×62×16 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 30×62×16 mm (1.181×2.441×0.63 in), 16.0 mm radial section height, C 37.5 kN, C0 30.5 kN, Pu 1.29 kN.SKF publishes only the 19,000 r/min limiting speed for this execution, catalogue mass 240 g. Selection figures for QJ 206 MA: the static-to-dynamic ratio C0/C is 0.81, Pu 1.29 kN is about 3 % of C, and catalogue mass works out to roughly 8 g per millimetre of bore. Load balance: C0 30.5 kN against C 37.5 kN gives a 0.81 ratio, typical of a four-point thrust-oriented design; Pu 1.29 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 62 over bore 30 is a 2.07× step for this size, and the 16 mm width gives a bore/width ratio of 1.88; use these ratios when housing space around the 30 mm shaft is the first constraint. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives"
    ],
    "failure_modes": [
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Without N2 slots, provide another positive anti-rotation feature for the radially loose outer ring",
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Anti-rotation is NOT built into QJ-206-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-206-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 206 MA as the qj plain execution; the other order numbers of the QJ 206 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-206-MA?",
        "a": "QJ 206 MA measures 30 mm bore × 62 mm OD × 16 mm width (1.181 × 2.441 × 0.63 in), mass about 240 g. SKF 17000 ratings: C 37.5 kN, C0 30.5 kN, Pu 1.29 kN, SKF publishes only the 19,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What does QJ mean in QJ 206 MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7206-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 22.5/14.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 22.5/14.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 24/15.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 24/15.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 24/15.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 25.5/17 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7206-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope, but catalogue C/C0 differ between executions (37.5/30.5 kN vs 27.5/17.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-206-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope with catalogue ratings within 10 %; QJ 206 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7206 BEP shares the 30×62×16 mm angular-contact envelope, but catalogue C/C0 differ (37.5/30.5 kN vs 22.5/14.3 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-206-MA",
      "QJ 206 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-306-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 306 N2MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 53,
    "static_load_kN": 41.5,
    "fatigue_load_limit_kN": 1.76,
    "limiting_speed_rpm": 17000,
    "max_rpm": 17000,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 306 N2MA is SKF's 30 mm-bore QJ four-point contact ball bearing of the QJ300 series, 30×72×19 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 30×72×19 mm (1.181×2.835×0.748 in), 21.0 mm radial section height, C 53 kN, C0 41.5 kN, Pu 1.76 kN.SKF publishes only the 17,000 r/min limiting speed for this execution, catalogue mass 420 g. At the printed limiting speed of 17,000 r/min the mean pitch diameter dm ≈ 51.0 mm implies a dn value around 867k mm·r/min; only the limiting speed is published for this execution. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 17,000 r/min and no separate thermal reference is published; at dm ≈ 51.0 mm the corresponding dn is approximately 867k mm·r/min. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 17,000 r/min limiting value is the single published ceiling. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives"
    ],
    "failure_modes": [
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "Anti-rotation is built into QJ-306-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-306-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 306 N2MA as the qj slotted execution; the other order numbers of the QJ 306 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-306-N2MA?",
        "a": "QJ 306 N2MA measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 420 g. SKF 17000 ratings: C 53 kN, C0 41.5 kN, Pu 1.76 kN, SKF publishes only the 17,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What minimum axial load does QJ-306-N2MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7306-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 32.5/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 32.5/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 35.5/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 35.5/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 35.5/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 37.5/23.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 39/23.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; QJ 306 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-306-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; QJ 306 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7306 BEP shares the 30×72×19 mm angular-contact envelope, but catalogue C/C0 differ (53/41.5 kN vs 32.5/19.3 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-306-N2MA",
      "QJ 306 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-306-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 306 MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 53,
    "static_load_kN": 41.5,
    "fatigue_load_limit_kN": 1.76,
    "limiting_speed_rpm": 17000,
    "max_rpm": 17000,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 306 MA is SKF's 30 mm-bore QJ four-point contact ball bearing of the QJ300 series, 30×72×19 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 30×72×19 mm (1.181×2.835×0.748 in), 21.0 mm radial section height, C 53 kN, C0 41.5 kN, Pu 1.76 kN.SKF publishes only the 17,000 r/min limiting speed for this execution, catalogue mass 420 g. Mass and section check: 420 g inside the 30×72×19 mm outline leaves a 21.0 mm radial section, and the 41.5 kN static rating is 0.78× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 41.5 kN against C 53 kN gives a 0.78 ratio, typical of a four-point thrust-oriented design; Pu 1.76 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 72 over bore 30 is a 2.40× step for this size, and the 19 mm width gives a bore/width ratio of 1.58; use these ratios when housing space around the 30 mm shaft is the first constraint. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "pump thrust positions",
      "clutch and brake assemblies",
      "textile machinery traverse drives"
    ],
    "failure_modes": [
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Anti-rotation is NOT built into QJ-306-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-306-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 306 MA as the qj plain execution; the other order numbers of the QJ 306 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-306-MA?",
        "a": "QJ 306 MA measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 420 g. SKF 17000 ratings: C 53 kN, C0 41.5 kN, Pu 1.76 kN, SKF publishes only the 17,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      },
      {
        "q": "What minimum axial load does QJ-306-MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7306-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 32.5/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 32.5/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 35.5/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 35.5/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 35.5/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 37.5/23.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 39/23.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; QJ 306 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-306-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; QJ 306 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7306 BEP shares the 30×72×19 mm angular-contact envelope, but catalogue C/C0 differ (53/41.5 kN vs 32.5/19.3 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-306-MA",
      "QJ 306 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-306-N2PHAS",
    "brand": "SKF",
    "manufacturer_designation": "QJ 306 N2PHAS",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 53,
    "static_load_kN": 41.5,
    "fatigue_load_limit_kN": 1.76,
    "limiting_speed_rpm": 17000,
    "max_rpm": 17000,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 306 N2PHAS is SKF's 30 mm-bore QJ four-point contact ball bearing of the QJ300 series, 30×72×19 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication. Envelope 30×72×19 mm (1.181×2.835×0.748 in), 21.0 mm radial section height, C 53 kN, C0 41.5 kN, Pu 1.76 kN.SKF publishes only the 17,000 r/min limiting speed for this execution, catalogue mass 420 g. Envelope economics: the 19 mm width over a 21.0 mm section yields 0.90 mm of ring width per section millimetre, and the bearing weighs 420 g for 53 kN of dynamic capacity — about 8 g per rated kN. Mass and section check: 420 g inside the 30×72×19 mm outline leaves a 21.0 mm radial section, and the 41.5 kN static rating is 0.78× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 72 over bore 30 is a 2.40× step for this size, and the 19 mm width gives a bore/width ratio of 1.58; use these ratios when housing space around the 30 mm shaft is the first constraint. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives",
      "pump thrust positions"
    ],
    "failure_modes": [
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Anti-rotation is built into QJ-306-N2PHAS: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The PHAS PEEK cage of QJ-306-N2PHAS is outer-ring-centred with lubrication grooves: feed clean oil-air or appropriate grease to the guide land and inspect groove filling at overhaul.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 306 N2PHAS as the qj slotted execution; the other order numbers of the QJ 306 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-306-N2PHAS?",
        "a": "QJ 306 N2PHAS measures 30 mm bore × 72 mm OD × 19 mm width (1.181 × 2.835 × 0.748 in), mass about 420 g. SKF 17000 ratings: C 53 kN, C0 41.5 kN, Pu 1.76 kN, SKF publishes only the 17,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2PHAS suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication."
      },
      {
        "q": "What does QJ mean in QJ 306 N2PHAS?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7306-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 32.5/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 32.5/19.3 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 35.5/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 35.5/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 35.5/21.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 37.5/23.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7306-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope, but catalogue C/C0 differ between executions (53/41.5 kN vs 39/23.6 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-306-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; QJ 306 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-306-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope with catalogue ratings within 10 %; QJ 306 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7306 BEP shares the 30×72×19 mm angular-contact envelope, but catalogue C/C0 differ (53/41.5 kN vs 32.5/19.3 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-306-N2PHAS",
      "QJ 306 N2PHAS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-207-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 207 N2MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 49,
    "static_load_kN": 41.5,
    "fatigue_load_limit_kN": 1.76,
    "limiting_speed_rpm": 17000,
    "max_rpm": 17000,
    "weight_g": 350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 207 N2MA is SKF's 35 mm-bore QJ four-point contact ball bearing of the QJ200 series, 35×72×17 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 35×72×17 mm (1.378×2.835×0.669 in), 18.5 mm radial section height, C 49 kN, C0 41.5 kN, Pu 1.76 kN.SKF publishes only the 17,000 r/min limiting speed for this execution, catalogue mass 350 g. At the printed limiting speed of 17,000 r/min the mean pitch diameter dm ≈ 53.5 mm implies a dn value around 910k mm·r/min; only the limiting speed is published for this execution. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 17,000 r/min and no separate thermal reference is published; at dm ≈ 53.5 mm the corresponding dn is approximately 910k mm·r/min. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 17,000 r/min limiting value is the single published ceiling. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives",
      "pump thrust positions"
    ],
    "failure_modes": [
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "edge loading from shaft deflection or housing misalignment",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Anti-rotation is built into QJ-207-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-207-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 207 N2MA as the qj slotted execution; the other order numbers of the QJ 207 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-207-N2MA?",
        "a": "QJ 207 N2MA measures 35 mm bore × 72 mm OD × 17 mm width (1.378 × 2.835 × 0.669 in), mass about 350 g. SKF 17000 ratings: C 49 kN, C0 41.5 kN, Pu 1.76 kN, SKF publishes only the 17,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What minimum axial load does QJ-207-N2MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7207-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (49/41.5 kN vs 29.1/19 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (49/41.5 kN vs 29.1/19 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (49/41.5 kN vs 31/20.8 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (49/41.5 kN vs 31/20.8 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (49/41.5 kN vs 32.5/22.4 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope, but catalogue C/C0 differ between executions (49/41.5 kN vs 35.5/23.2 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7207 BEP shares the 35×72×17 mm angular-contact envelope, but catalogue C/C0 differ (49/41.5 kN vs 29.1/19 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-207-N2MA",
      "QJ 207 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-307-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 307 N2MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 64,
    "static_load_kN": 51,
    "fatigue_load_limit_kN": 2.16,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 307 N2MA is SKF's 35 mm-bore QJ four-point contact ball bearing of the QJ300 series, 35×80×21 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 35×80×21 mm (1.378×3.15×0.827 in), 22.5 mm radial section height, C 64 kN, C0 51 kN, Pu 2.16 kN.SKF publishes only the 15,000 r/min limiting speed for this execution, catalogue mass 570 g. The 2.16 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 64/51 kN ratings and 570 g mass this execution carries about 1.83 kN of C per millimetre of bore. Selection figures for QJ 307 N2MA: the static-to-dynamic ratio C0/C is 0.80, Pu 2.16 kN is about 3 % of C, and catalogue mass works out to roughly 16 g per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 15,000 r/min limiting value is the single published ceiling. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "screw and worm drives",
      "pump thrust positions",
      "clutch and brake assemblies"
    ],
    "failure_modes": [
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Anti-rotation is built into QJ-307-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-307-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 307 N2MA as the qj slotted execution; the other order numbers of the QJ 307 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-307-N2MA?",
        "a": "QJ 307 N2MA measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 570 g. SKF 17000 ratings: C 64 kN, C0 51 kN, Pu 2.16 kN, SKF publishes only the 15,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      },
      {
        "q": "What does QJ mean in QJ 307 N2MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7307-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 39/24.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 39/24.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 46.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; QJ 307 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-307-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; QJ 307 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7307 BEP shares the 35×80×21 mm angular-contact envelope, but catalogue C/C0 differ (64/51 kN vs 39/24.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-307-N2MA",
      "QJ 307 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-307-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 307 MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 64,
    "static_load_kN": 51,
    "fatigue_load_limit_kN": 2.16,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 307 MA is SKF's 35 mm-bore QJ four-point contact ball bearing of the QJ300 series, 35×80×21 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 35×80×21 mm (1.378×3.15×0.827 in), 22.5 mm radial section height, C 64 kN, C0 51 kN, Pu 2.16 kN.SKF publishes only the 15,000 r/min limiting speed for this execution, catalogue mass 570 g. Selection figures for QJ 307 MA: the static-to-dynamic ratio C0/C is 0.80, Pu 2.16 kN is about 3 % of C, and catalogue mass works out to roughly 16 g per millimetre of bore. Load balance: C0 51 kN against C 64 kN gives a 0.80 ratio, typical of a four-point thrust-oriented design; Pu 2.16 kN enters the SKF adjusted-life equation rather than the basic rating life. Bore-to-OD planning: OD 80 over bore 35 is a 2.29× step for this size, and the 21 mm width gives a bore/width ratio of 1.67; use these ratios when housing space around the 35 mm shaft is the first constraint. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "clutch and brake assemblies",
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing"
    ],
    "failure_modes": [
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "Anti-rotation is NOT built into QJ-307-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-307-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 307 MA as the qj plain execution; the other order numbers of the QJ 307 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-307-MA?",
        "a": "QJ 307 MA measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 570 g. SKF 17000 ratings: C 64 kN, C0 51 kN, Pu 2.16 kN, SKF publishes only the 15,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What does QJ mean in QJ 307 MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7307-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 39/24.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 39/24.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 46.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; QJ 307 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-307-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; QJ 307 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7307 BEP shares the 35×80×21 mm angular-contact envelope, but catalogue C/C0 differ (64/51 kN vs 39/24.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-307-MA",
      "QJ 307 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-307-N2PHAS",
    "brand": "SKF",
    "manufacturer_designation": "QJ 307 N2PHAS",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 64,
    "static_load_kN": 51,
    "fatigue_load_limit_kN": 2.16,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 307 N2PHAS is SKF's 35 mm-bore QJ four-point contact ball bearing of the QJ300 series, 35×80×21 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication. Envelope 35×80×21 mm (1.378×3.15×0.827 in), 22.5 mm radial section height, C 64 kN, C0 51 kN, Pu 2.16 kN.SKF publishes only the 15,000 r/min limiting speed for this execution, catalogue mass 570 g. Load balance: C0 51 kN against C 64 kN gives a 0.80 ratio, typical of a four-point thrust-oriented design; Pu 2.16 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 570 g inside the 35×80×21 mm outline leaves a 22.5 mm radial section, and the 51 kN static rating is 0.80× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Bore-to-OD planning: OD 80 over bore 35 is a 2.29× step for this size, and the 21 mm width gives a bore/width ratio of 1.67; use these ratios when housing space around the 35 mm shaft is the first constraint. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives",
      "pump thrust positions"
    ],
    "failure_modes": [
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Anti-rotation is built into QJ-307-N2PHAS: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The PHAS PEEK cage of QJ-307-N2PHAS is outer-ring-centred with lubrication grooves: feed clean oil-air or appropriate grease to the guide land and inspect groove filling at overhaul.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 307 N2PHAS as the qj slotted execution; the other order numbers of the QJ 307 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-307-N2PHAS?",
        "a": "QJ 307 N2PHAS measures 35 mm bore × 80 mm OD × 21 mm width (1.378 × 3.15 × 0.827 in), mass about 570 g. SKF 17000 ratings: C 64 kN, C0 51 kN, Pu 2.16 kN, SKF publishes only the 15,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2PHAS suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      },
      {
        "q": "What minimum axial load does QJ-307-N2PHAS require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7307-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 39/24.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 39/24.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 41.5/26.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7307-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope, but catalogue C/C0 differ between executions (64/51 kN vs 46.5/30 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-307-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; QJ 307 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-307-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope with catalogue ratings within 10 %; QJ 307 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7307 BEP shares the 35×80×21 mm angular-contact envelope, but catalogue C/C0 differ (64/51 kN vs 39/24.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-307-N2PHAS",
      "QJ 307 N2PHAS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-208-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 208 MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 56,
    "static_load_kN": 49,
    "fatigue_load_limit_kN": 2.08,
    "limiting_speed_rpm": 15000,
    "max_rpm": 15000,
    "weight_g": 450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 208 MA is SKF's 40 mm-bore QJ four-point contact ball bearing of the QJ200 series, 40×80×18 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 40×80×18 mm (1.575×3.15×0.709 in), 20.0 mm radial section height, C 56 kN, C0 49 kN, Pu 2.08 kN.SKF publishes only the 15,000 r/min limiting speed for this execution, catalogue mass 450 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 15,000 r/min and no separate thermal reference is published; at dm ≈ 60.0 mm the corresponding dn is approximately 900k mm·r/min. Sizing arithmetic on the 40 mm bore: 56 kN C divided by the 20.0 mm radial section height gives 2.8 kN per section millimetre; the 450 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 15,000 r/min limiting value is the single published ceiling. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives",
      "pump thrust positions"
    ],
    "failure_modes": [
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Anti-rotation is NOT built into QJ-208-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-208-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 208 MA as the qj plain execution; the other order numbers of the QJ 208 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-208-MA?",
        "a": "QJ 208 MA measures 40 mm bore × 80 mm OD × 18 mm width (1.575 × 3.15 × 0.709 in), mass about 450 g. SKF 17000 ratings: C 56 kN, C0 49 kN, Pu 2.08 kN, SKF publishes only the 15,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What minimum axial load does QJ-208-MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7208-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (56/49 kN vs 34.5/24 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (56/49 kN vs 34.5/24 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (56/49 kN vs 36.5/26 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (56/49 kN vs 36.5/26 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (56/49 kN vs 36.5/26 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (56/49 kN vs 39/28 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope, but catalogue C/C0 differ between executions (56/49 kN vs 41.5/29 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7208 BEP shares the 40×80×18 mm angular-contact envelope, but catalogue C/C0 differ (56/49 kN vs 34.5/24 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-208-MA",
      "QJ 208 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-308-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 308 N2MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 78,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 2.7,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 780,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 308 N2MA is SKF's 40 mm-bore QJ four-point contact ball bearing of the QJ300 series, 40×90×23 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 40×90×23 mm (1.575×3.543×0.906 in), 25.0 mm radial section height, C 78 kN, C0 64 kN, Pu 2.7 kN.SKF publishes only the 14,000 r/min limiting speed for this execution, catalogue mass 780 g. Envelope economics: the 23 mm width over a 25.0 mm section yields 0.92 mm of ring width per section millimetre, and the bearing weighs 780 g for 78 kN of dynamic capacity — about 10 g per rated kN. Selection figures for QJ 308 N2MA: the static-to-dynamic ratio C0/C is 0.82, Pu 2.7 kN is about 3 % of C, and catalogue mass works out to roughly 20 g per millimetre of bore. Bore-to-OD planning: OD 90 over bore 40 is a 2.25× step for this size, and the 23 mm width gives a bore/width ratio of 1.74; use these ratios when housing space around the 40 mm shaft is the first constraint. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives"
    ],
    "failure_modes": [
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Engage the N2 slots with housing dogs at assembly — a radially loose outer ring without positive anti-rotation creeps its seat",
      "Anti-rotation is built into QJ-308-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-308-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 308 N2MA as the qj slotted execution; the other order numbers of the QJ 308 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-308-N2MA?",
        "a": "QJ 308 N2MA measures 40 mm bore × 90 mm OD × 23 mm width (1.575 × 3.543 × 0.906 in), mass about 780 g. SKF 17000 ratings: C 78 kN, C0 64 kN, Pu 2.7 kN, SKF publishes only the 14,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What does QJ mean in QJ 308 N2MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7308-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 46.2/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 46.2/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 50/32.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 50/32.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 50/32.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 53/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 56/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; QJ 308 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-308-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; QJ 308 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7308 BEP shares the 40×90×23 mm angular-contact envelope, but catalogue C/C0 differ (78/64 kN vs 46.2/30.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-308-N2MA",
      "QJ 308 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-308-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 308 MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 78,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 2.7,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 780,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 308 MA is SKF's 40 mm-bore QJ four-point contact ball bearing of the QJ300 series, 40×90×23 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 40×90×23 mm (1.575×3.543×0.906 in), 25.0 mm radial section height, C 78 kN, C0 64 kN, Pu 2.7 kN.SKF publishes only the 14,000 r/min limiting speed for this execution, catalogue mass 780 g. The 2.7 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 78/64 kN ratings and 780 g mass this execution carries about 1.95 kN of C per millimetre of bore. Sizing arithmetic on the 40 mm bore: 78 kN C divided by the 25.0 mm radial section height gives 3.1 kN per section millimetre; the 780 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 14,000 r/min limiting value is the single published ceiling. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "clutch and brake assemblies",
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing"
    ],
    "failure_modes": [
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "raceway staining from water in the lubricant during idle periods",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Without N2 slots, provide another positive anti-rotation feature for the radially loose outer ring",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Anti-rotation is NOT built into QJ-308-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-308-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 308 MA as the qj plain execution; the other order numbers of the QJ 308 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-308-MA?",
        "a": "QJ 308 MA measures 40 mm bore × 90 mm OD × 23 mm width (1.575 × 3.543 × 0.906 in), mass about 780 g. SKF 17000 ratings: C 78 kN, C0 64 kN, Pu 2.7 kN, SKF publishes only the 14,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      },
      {
        "q": "What does QJ mean in QJ 308 MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7308-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 46.2/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 46.2/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 50/32.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 50/32.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 50/32.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 53/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 56/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; QJ 308 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-308-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; QJ 308 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7308 BEP shares the 40×90×23 mm angular-contact envelope, but catalogue C/C0 differ (78/64 kN vs 46.2/30.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-308-MA",
      "QJ 308 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-308-N2PHAS",
    "brand": "SKF",
    "manufacturer_designation": "QJ 308 N2PHAS",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 78,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 2.7,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 780,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 308 N2PHAS is SKF's 40 mm-bore QJ four-point contact ball bearing of the QJ300 series, 40×90×23 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication. Envelope 40×90×23 mm (1.575×3.543×0.906 in), 25.0 mm radial section height, C 78 kN, C0 64 kN, Pu 2.7 kN.SKF publishes only the 14,000 r/min limiting speed for this execution, catalogue mass 780 g. At the printed limiting speed of 14,000 r/min the mean pitch diameter dm ≈ 65.0 mm implies a dn value around 910k mm·r/min; only the limiting speed is published for this execution. The 2.7 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 78/64 kN ratings and 780 g mass this execution carries about 1.95 kN of C per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 14,000 r/min limiting value is the single published ceiling. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "clutch and brake assemblies",
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing"
    ],
    "failure_modes": [
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "edge loading from shaft deflection or housing misalignment",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Engage the N2 slots with housing dogs at assembly — a radially loose outer ring without positive anti-rotation creeps its seat",
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Anti-rotation is built into QJ-308-N2PHAS: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The PHAS PEEK cage of QJ-308-N2PHAS is outer-ring-centred with lubrication grooves: feed clean oil-air or appropriate grease to the guide land and inspect groove filling at overhaul.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 308 N2PHAS as the qj slotted execution; the other order numbers of the QJ 308 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-308-N2PHAS?",
        "a": "QJ 308 N2PHAS measures 40 mm bore × 90 mm OD × 23 mm width (1.575 × 3.543 × 0.906 in), mass about 780 g. SKF 17000 ratings: C 78 kN, C0 64 kN, Pu 2.7 kN, SKF publishes only the 14,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2PHAS suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication."
      },
      {
        "q": "What minimum axial load does QJ-308-N2PHAS require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7308-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 46.2/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 46.2/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 50/32.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 50/32.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 50/32.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 53/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7308-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope, but catalogue C/C0 differ between executions (78/64 kN vs 56/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-308-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; QJ 308 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-308-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope with catalogue ratings within 10 %; QJ 308 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7308 BEP shares the 40×90×23 mm angular-contact envelope, but catalogue C/C0 differ (78/64 kN vs 46.2/30.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-308-N2PHAS",
      "QJ 308 N2PHAS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-209-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 209 MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 63,
    "static_load_kN": 56,
    "fatigue_load_limit_kN": 2.36,
    "limiting_speed_rpm": 14000,
    "max_rpm": 14000,
    "weight_g": 520,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 209 MA is SKF's 45 mm-bore QJ four-point contact ball bearing of the QJ200 series, 45×85×19 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 45×85×19 mm (1.772×3.346×0.748 in), 20.0 mm radial section height, C 63 kN, C0 56 kN, Pu 2.36 kN.SKF publishes only the 14,000 r/min limiting speed for this execution, catalogue mass 520 g. The 2.36 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 63/56 kN ratings and 520 g mass this execution carries about 1.40 kN of C per millimetre of bore. Sizing arithmetic on the 45 mm bore: 63 kN C divided by the 20.0 mm radial section height gives 3.1 kN per section millimetre; the 520 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 14,000 r/min limiting value is the single published ceiling. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "clutch and brake assemblies",
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing"
    ],
    "failure_modes": [
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "raceway staining from water in the lubricant during idle periods",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "Anti-rotation is NOT built into QJ-209-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-209-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 209 MA as the qj plain execution; the other order numbers of the QJ 209 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-209-MA?",
        "a": "QJ 209 MA measures 45 mm bore × 85 mm OD × 19 mm width (1.772 × 3.346 × 0.748 in), mass about 520 g. SKF 17000 ratings: C 63 kN, C0 56 kN, Pu 2.36 kN, SKF publishes only the 14,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      },
      {
        "q": "What does QJ mean in QJ 209 MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7209-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (63/56 kN vs 35.8/26 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (63/56 kN vs 38/28.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (63/56 kN vs 38/28.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (63/56 kN vs 38/28.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (63/56 kN vs 40/30.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope, but catalogue C/C0 differ between executions (63/56 kN vs 44/32 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7209",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7209 BECBP shares the 45×85×19 mm angular-contact envelope, but catalogue C/C0 differ (63/56 kN vs 38/28.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-209-MA",
      "QJ 209 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-309-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 309 N2MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 100,
    "static_load_kN": 83,
    "fatigue_load_limit_kN": 3.55,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 309 N2MA is SKF's 45 mm-bore QJ four-point contact ball bearing of the QJ300 series, 45×100×25 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 45×100×25 mm (1.772×3.937×0.984 in), 27.5 mm radial section height, C 100 kN, C0 83 kN, Pu 3.55 kN.SKF publishes only the 12,000 r/min limiting speed for this execution, catalogue mass 1050 g. Mass and section check: 1050 g inside the 45×100×25 mm outline leaves a 27.5 mm radial section, and the 83 kN static rating is 0.83× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 12,000 r/min the mean pitch diameter dm ≈ 72.5 mm implies a dn value around 870k mm·r/min; only the limiting speed is published for this execution. Bore-to-OD planning: OD 100 over bore 45 is a 2.22× step for this size, and the 25 mm width gives a bore/width ratio of 1.80; use these ratios when housing space around the 45 mm shaft is the first constraint. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "pump thrust positions",
      "clutch and brake assemblies",
      "textile machinery traverse drives"
    ],
    "failure_modes": [
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "Anti-rotation is built into QJ-309-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-309-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 309 N2MA as the qj slotted execution; the other order numbers of the QJ 309 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-309-N2MA?",
        "a": "QJ 309 N2MA measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 1050 g. SKF 17000 ratings: C 100 kN, C0 83 kN, Pu 3.55 kN, SKF publishes only the 12,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      },
      {
        "q": "What minimum axial load does QJ-309-N2MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7309-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 55.9/37.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 55.9/37.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 64/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 68/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; QJ 309 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-309-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; QJ 309 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-309-PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; QJ 309 PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7309 BEP shares the 45×100×25 mm angular-contact envelope, but catalogue C/C0 differ (100/83 kN vs 55.9/37.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-309-N2MA",
      "QJ 309 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-309-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 309 MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 100,
    "static_load_kN": 83,
    "fatigue_load_limit_kN": 3.55,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 309 MA is SKF's 45 mm-bore QJ four-point contact ball bearing of the QJ300 series, 45×100×25 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 45×100×25 mm (1.772×3.937×0.984 in), 27.5 mm radial section height, C 100 kN, C0 83 kN, Pu 3.55 kN.SKF publishes only the 12,000 r/min limiting speed for this execution, catalogue mass 1050 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 12,000 r/min and no separate thermal reference is published; at dm ≈ 72.5 mm the corresponding dn is approximately 870k mm·r/min. Sizing arithmetic on the 45 mm bore: 100 kN C divided by the 27.5 mm radial section height gives 3.6 kN per section millimetre; the 1050 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 12,000 r/min limiting value is the single published ceiling. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "clutch and brake assemblies",
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing"
    ],
    "failure_modes": [
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "Anti-rotation is NOT built into QJ-309-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-309-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 309 MA as the qj plain execution; the other order numbers of the QJ 309 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-309-MA?",
        "a": "QJ 309 MA measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 1050 g. SKF 17000 ratings: C 100 kN, C0 83 kN, Pu 3.55 kN, SKF publishes only the 12,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What minimum axial load does QJ-309-MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7309-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 55.9/37.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 55.9/37.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 64/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 68/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; QJ 309 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-309-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; QJ 309 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-309-PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; QJ 309 PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7309 BEP shares the 45×100×25 mm angular-contact envelope, but catalogue C/C0 differ (100/83 kN vs 55.9/37.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-309-MA",
      "QJ 309 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-309-N2PHAS",
    "brand": "SKF",
    "manufacturer_designation": "QJ 309 N2PHAS",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 100,
    "static_load_kN": 83,
    "fatigue_load_limit_kN": 3.55,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 309 N2PHAS is SKF's 45 mm-bore QJ four-point contact ball bearing of the QJ300 series, 45×100×25 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication. Envelope 45×100×25 mm (1.772×3.937×0.984 in), 27.5 mm radial section height, C 100 kN, C0 83 kN, Pu 3.55 kN.SKF publishes only the 12,000 r/min limiting speed for this execution, catalogue mass 1050 g. Sizing arithmetic on the 45 mm bore: 100 kN C divided by the 27.5 mm radial section height gives 3.6 kN per section millimetre; the 1050 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. The 3.55 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 100/83 kN ratings and 1050 g mass this execution carries about 2.22 kN of C per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 12,000 r/min limiting value is the single published ceiling. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives"
    ],
    "failure_modes": [
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Engage the N2 slots with housing dogs at assembly — a radially loose outer ring without positive anti-rotation creeps its seat",
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Engage the N2 slots with housing dogs at assembly — a radially loose outer ring without positive anti-rotation creeps its seat",
      "Anti-rotation is built into QJ-309-N2PHAS: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The PHAS PEEK cage of QJ-309-N2PHAS is outer-ring-centred with lubrication grooves: feed clean oil-air or appropriate grease to the guide land and inspect groove filling at overhaul.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 309 N2PHAS as the qj slotted execution; the other order numbers of the QJ 309 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-309-N2PHAS?",
        "a": "QJ 309 N2PHAS measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 1050 g. SKF 17000 ratings: C 100 kN, C0 83 kN, Pu 3.55 kN, SKF publishes only the 12,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2PHAS suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      },
      {
        "q": "What does QJ mean in QJ 309 N2PHAS?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7309-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 55.9/37.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 55.9/37.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 64/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 68/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; QJ 309 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-309-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; QJ 309 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-309-PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; QJ 309 PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7309 BEP shares the 45×100×25 mm angular-contact envelope, but catalogue C/C0 differ (100/83 kN vs 55.9/37.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-309-N2PHAS",
      "QJ 309 N2PHAS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-309-PHAS",
    "brand": "SKF",
    "manufacturer_designation": "QJ 309 PHAS",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 100,
    "static_load_kN": 83,
    "fatigue_load_limit_kN": 3.55,
    "limiting_speed_rpm": 12000,
    "max_rpm": 12000,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 309 PHAS is SKF's 45 mm-bore QJ four-point contact ball bearing of the QJ300 series, 45×100×25 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication. Envelope 45×100×25 mm (1.772×3.937×0.984 in), 27.5 mm radial section height, C 100 kN, C0 83 kN, Pu 3.55 kN.SKF publishes only the 12,000 r/min limiting speed for this execution, catalogue mass 1050 g. Envelope economics: the 25 mm width over a 27.5 mm section yields 0.91 mm of ring width per section millimetre, and the bearing weighs 1050 g for 100 kN of dynamic capacity — about 11 g per rated kN. Selection figures for QJ 309 PHAS: the static-to-dynamic ratio C0/C is 0.83, Pu 3.55 kN is about 4 % of C, and catalogue mass works out to roughly 23 g per millimetre of bore. Bore-to-OD planning: OD 100 over bore 45 is a 2.22× step for this size, and the 25 mm width gives a bore/width ratio of 1.80; use these ratios when housing space around the 45 mm shaft is the first constraint. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "pump thrust positions",
      "clutch and brake assemblies",
      "textile machinery traverse drives"
    ],
    "failure_modes": [
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Anti-rotation is NOT built into QJ-309-PHAS: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The PHAS PEEK cage of QJ-309-PHAS is outer-ring-centred with lubrication grooves: feed clean oil-air or appropriate grease to the guide land and inspect groove filling at overhaul.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 309 PHAS as the qj plain execution; the other order numbers of the QJ 309 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-309-PHAS?",
        "a": "QJ 309 PHAS measures 45 mm bore × 100 mm OD × 25 mm width (1.772 × 3.937 × 0.984 in), mass about 1050 g. SKF 17000 ratings: C 100 kN, C0 83 kN, Pu 3.55 kN, SKF publishes only the 12,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the PHAS suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication."
      },
      {
        "q": "What does QJ mean in QJ 309 PHAS?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7309-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 55.9/37.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 55.9/37.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 61/40.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 64/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7309-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope, but catalogue C/C0 differ between executions (100/83 kN vs 68/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-309-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; QJ 309 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-309-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; QJ 309 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-309-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope with catalogue ratings within 10 %; QJ 309 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7309 BEP shares the 45×100×25 mm angular-contact envelope, but catalogue C/C0 differ (100/83 kN vs 55.9/37.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-309-PHAS",
      "QJ 309 PHAS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-210-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 210 MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 65.5,
    "static_load_kN": 61,
    "fatigue_load_limit_kN": 2.6,
    "limiting_speed_rpm": 13000,
    "max_rpm": 13000,
    "weight_g": 590,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 210 MA is SKF's 50 mm-bore QJ four-point contact ball bearing of the QJ200 series, 50×90×20 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 50×90×20 mm (1.969×3.543×0.787 in), 20.0 mm radial section height, C 65.5 kN, C0 61 kN, Pu 2.6 kN.SKF publishes only the 13,000 r/min limiting speed for this execution, catalogue mass 590 g. Mass and section check: 590 g inside the 50×90×20 mm outline leaves a 20.0 mm radial section, and the 61 kN static rating is 0.93× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Load balance: C0 61 kN against C 65.5 kN gives a 0.93 ratio, typical of a four-point thrust-oriented design; Pu 2.6 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 13,000 r/min limiting value is the single published ceiling. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives",
      "pump thrust positions"
    ],
    "failure_modes": [
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Anti-rotation is NOT built into QJ-210-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-210-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 210 MA as the qj plain execution; the other order numbers of the QJ 210 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-210-MA?",
        "a": "QJ 210 MA measures 50 mm bore × 90 mm OD × 20 mm width (1.969 × 3.543 × 0.787 in), mass about 590 g. SKF 17000 ratings: C 65.5 kN, C0 61 kN, Pu 2.6 kN, SKF publishes only the 13,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      },
      {
        "q": "What minimum axial load does QJ-210-MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7210-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (65.5/61 kN vs 37.7/28.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (65.5/61 kN vs 37.7/28.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (65.5/61 kN vs 40/31 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (65.5/61 kN vs 40/31 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (65.5/61 kN vs 40/31 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (65.5/61 kN vs 41.5/33.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope, but catalogue C/C0 differ between executions (65.5/61 kN vs 45.5/35.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7210",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7210 BEP shares the 50×90×20 mm angular-contact envelope, but catalogue C/C0 differ (65.5/61 kN vs 37.7/28.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-210-MA",
      "QJ 210 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-310-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 310 MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 118,
    "static_load_kN": 100,
    "fatigue_load_limit_kN": 4.25,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 1350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 310 MA is SKF's 50 mm-bore QJ four-point contact ball bearing of the QJ300 series, 50×110×27 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 50×110×27 mm (1.969×4.331×1.063 in), 30.0 mm radial section height, C 118 kN, C0 100 kN, Pu 4.25 kN.SKF publishes only the 11,000 r/min limiting speed for this execution, catalogue mass 1350 g. Envelope economics: the 27 mm width over a 30.0 mm section yields 0.90 mm of ring width per section millimetre, and the bearing weighs 1350 g for 118 kN of dynamic capacity — about 11 g per rated kN. Mass and section check: 1350 g inside the 50×110×27 mm outline leaves a 30.0 mm radial section, and the 100 kN static rating is 0.85× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 11,000 r/min limiting value is the single published ceiling. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "clutch and brake assemblies",
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing"
    ],
    "failure_modes": [
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Without N2 slots, provide another positive anti-rotation feature for the radially loose outer ring",
      "Anti-rotation is NOT built into QJ-310-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-310-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 310 MA as the qj plain execution; the other order numbers of the QJ 310 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-310-MA?",
        "a": "QJ 310 MA measures 50 mm bore × 110 mm OD × 27 mm width (1.969 × 4.331 × 1.063 in), mass about 1350 g. SKF 17000 ratings: C 118 kN, C0 100 kN, Pu 4.25 kN, SKF publishes only the 11,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What does QJ mean in QJ 310 MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7310-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (118/100 kN vs 68.9/47.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (118/100 kN vs 75/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (118/100 kN vs 75/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (118/100 kN vs 75/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (118/100 kN vs 78/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (118/100 kN vs 83/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-310-PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; QJ 310 PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7310 BECBP shares the 50×110×27 mm angular-contact envelope, but catalogue C/C0 differ (118/100 kN vs 75/51 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-310-MA",
      "QJ 310 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-310-PHAS",
    "brand": "SKF",
    "manufacturer_designation": "QJ 310 PHAS",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 118,
    "static_load_kN": 100,
    "fatigue_load_limit_kN": 4.25,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 1350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 310 PHAS is SKF's 50 mm-bore QJ four-point contact ball bearing of the QJ300 series, 50×110×27 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication. Envelope 50×110×27 mm (1.969×4.331×1.063 in), 30.0 mm radial section height, C 118 kN, C0 100 kN, Pu 4.25 kN.SKF publishes only the 11,000 r/min limiting speed for this execution, catalogue mass 1350 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 11,000 r/min and no separate thermal reference is published; at dm ≈ 80.0 mm the corresponding dn is approximately 880k mm·r/min. At the printed limiting speed of 11,000 r/min the mean pitch diameter dm ≈ 80.0 mm implies a dn value around 880k mm·r/min; only the limiting speed is published for this execution. Bore-to-OD planning: OD 110 over bore 50 is a 2.20× step for this size, and the 27 mm width gives a bore/width ratio of 1.85; use these ratios when housing space around the 50 mm shaft is the first constraint. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "pump thrust positions",
      "clutch and brake assemblies",
      "textile machinery traverse drives"
    ],
    "failure_modes": [
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "The PHAS PEEK outer-ring-centred cage with lubrication grooves suits the highest speeds with oil-air lubrication",
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Anti-rotation is NOT built into QJ-310-PHAS: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The PHAS PEEK cage of QJ-310-PHAS is outer-ring-centred with lubrication grooves: feed clean oil-air or appropriate grease to the guide land and inspect groove filling at overhaul.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 310 PHAS as the qj plain execution; the other order numbers of the QJ 310 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-310-PHAS?",
        "a": "QJ 310 PHAS measures 50 mm bore × 110 mm OD × 27 mm width (1.969 × 4.331 × 1.063 in), mass about 1350 g. SKF 17000 ratings: C 118 kN, C0 100 kN, Pu 4.25 kN, SKF publishes only the 11,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the PHAS suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication."
      },
      {
        "q": "What minimum axial load does QJ-310-PHAS require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7310-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (118/100 kN vs 68.9/47.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (118/100 kN vs 75/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (118/100 kN vs 75/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (118/100 kN vs 75/51 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (118/100 kN vs 78/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7310-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope, but catalogue C/C0 differ between executions (118/100 kN vs 83/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-310-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope with catalogue ratings within 10 %; QJ 310 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7310",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7310 BECBP shares the 50×110×27 mm angular-contact envelope, but catalogue C/C0 differ (118/100 kN vs 75/51 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-310-PHAS",
      "QJ 310 PHAS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-211-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 211 N2MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 85,
    "static_load_kN": 83,
    "fatigue_load_limit_kN": 3.55,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 770,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 211 N2MA is SKF's 55 mm-bore QJ four-point contact ball bearing of the QJ200 series, 55×100×21 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 55×100×21 mm (2.165×3.937×0.827 in), 22.5 mm radial section height, C 85 kN, C0 83 kN, Pu 3.55 kN.SKF publishes only the 11,000 r/min limiting speed for this execution, catalogue mass 770 g. The 3.55 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 85/83 kN ratings and 770 g mass this execution carries about 1.55 kN of C per millimetre of bore. Selection figures for QJ 211 N2MA: the static-to-dynamic ratio C0/C is 0.98, Pu 3.55 kN is about 4 % of C, and catalogue mass works out to roughly 14 g per millimetre of bore. Bore-to-OD planning: OD 100 over bore 55 is a 1.82× step for this size, and the 21 mm width gives a bore/width ratio of 2.62; use these ratios when housing space around the 55 mm shaft is the first constraint. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "screw and worm drives",
      "pump thrust positions",
      "clutch and brake assemblies"
    ],
    "failure_modes": [
      "outer-ring creep and seat fretting where a N2-locating-slot bearing is not positively stopped",
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "raceway staining from water in the lubricant during idle periods",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Anti-rotation is built into QJ-211-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-211-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 211 N2MA as the qj slotted execution; the other order numbers of the QJ 211 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-211-N2MA?",
        "a": "QJ 211 N2MA measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 770 g. SKF 17000 ratings: C 85 kN, C0 83 kN, Pu 3.55 kN, SKF publishes only the 11,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      },
      {
        "q": "What does QJ mean in QJ 211 N2MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7211-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 51/42.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 57/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; QJ 211 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7211 BEP shares the 55×100×21 mm angular-contact envelope, but catalogue C/C0 differ (85/83 kN vs 46.2/36 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-211-N2MA",
      "QJ 211 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-211-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 211 MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 85,
    "static_load_kN": 83,
    "fatigue_load_limit_kN": 3.55,
    "limiting_speed_rpm": 11000,
    "max_rpm": 11000,
    "weight_g": 770,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 211 MA is SKF's 55 mm-bore QJ four-point contact ball bearing of the QJ200 series, 55×100×21 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 55×100×21 mm (2.165×3.937×0.827 in), 22.5 mm radial section height, C 85 kN, C0 83 kN, Pu 3.55 kN.SKF publishes only the 11,000 r/min limiting speed for this execution, catalogue mass 770 g. Selection figures for QJ 211 MA: the static-to-dynamic ratio C0/C is 0.98, Pu 3.55 kN is about 4 % of C, and catalogue mass works out to roughly 14 g per millimetre of bore. Load balance: C0 83 kN against C 85 kN gives a 0.98 ratio, typical of a four-point thrust-oriented design; Pu 3.55 kN enters the SKF adjusted-life equation rather than the basic rating life. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 11,000 r/min limiting value is the single published ceiling. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "clutch and brake assemblies",
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing"
    ],
    "failure_modes": [
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "outer-ring creep and seat fretting where a N2-locating-slot bearing is not positively stopped",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "brinelling from pressing the ring home through the balls or from static overload",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Without N2 slots, provide another positive anti-rotation feature for the radially loose outer ring",
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "Anti-rotation is NOT built into QJ-211-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-211-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 211 MA as the qj plain execution; the other order numbers of the QJ 211 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-211-MA?",
        "a": "QJ 211 MA measures 55 mm bore × 100 mm OD × 21 mm width (2.165 × 3.937 × 0.827 in), mass about 770 g. SKF 17000 ratings: C 85 kN, C0 83 kN, Pu 3.55 kN, SKF publishes only the 11,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What does QJ mean in QJ 211 MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7211-BE-2RZP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 46.2/36 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 49/40 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 51/42.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7211-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope, but catalogue C/C0 differ between executions (85/83 kN vs 57/45 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-211-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope with catalogue ratings within 10 %; QJ 211 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7211 BEP shares the 55×100×21 mm angular-contact envelope, but catalogue C/C0 differ (85/83 kN vs 46.2/36 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-211-MA",
      "QJ 211 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-311-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 311 N2MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 137,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 5,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 311 N2MA is SKF's 55 mm-bore QJ four-point contact ball bearing of the QJ300 series, 55×120×29 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 55×120×29 mm (2.165×4.724×1.142 in), 32.5 mm radial section height, C 137 kN, C0 118 kN, Pu 5 kN.SKF publishes only the 10,000 r/min limiting speed for this execution, catalogue mass 1750 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 10,000 r/min and no separate thermal reference is published; at dm ≈ 87.5 mm the corresponding dn is approximately 875k mm·r/min. At the printed limiting speed of 10,000 r/min the mean pitch diameter dm ≈ 87.5 mm implies a dn value around 875k mm·r/min; only the limiting speed is published for this execution. Bore-to-OD planning: OD 120 over bore 55 is a 2.18× step for this size, and the 29 mm width gives a bore/width ratio of 1.90; use these ratios when housing space around the 55 mm shaft is the first constraint. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "pump thrust positions",
      "clutch and brake assemblies",
      "textile machinery traverse drives"
    ],
    "failure_modes": [
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "outer-ring creep and seat fretting where a N2-locating-slot bearing is not positively stopped",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "Anti-rotation is built into QJ-311-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-311-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 311 N2MA as the qj slotted execution; the other order numbers of the QJ 311 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-311-N2MA?",
        "a": "QJ 311 N2MA measures 55 mm bore × 120 mm OD × 29 mm width (2.165 × 4.724 × 1.142 in), mass about 1750 g. SKF 17000 ratings: C 137 kN, C0 118 kN, Pu 5 kN, SKF publishes only the 10,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What minimum axial load does QJ-311-N2MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7311-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (137/118 kN vs 79.3/55 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (137/118 kN vs 85/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (137/118 kN vs 85/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (137/118 kN vs 85/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (137/118 kN vs 90/65.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (137/118 kN vs 96.5/67 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-311-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; QJ 311 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7311 BEP shares the 55×120×29 mm angular-contact envelope, but catalogue C/C0 differ (137/118 kN vs 79.3/55 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-311-N2MA",
      "QJ 311 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-311-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 311 MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 137,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 5,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 311 MA is SKF's 55 mm-bore QJ four-point contact ball bearing of the QJ300 series, 55×120×29 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 55×120×29 mm (2.165×4.724×1.142 in), 32.5 mm radial section height, C 137 kN, C0 118 kN, Pu 5 kN.SKF publishes only the 10,000 r/min limiting speed for this execution, catalogue mass 1750 g. Load balance: C0 118 kN against C 137 kN gives a 0.86 ratio, typical of a four-point thrust-oriented design; Pu 5 kN enters the SKF adjusted-life equation rather than the basic rating life. Mass and section check: 1750 g inside the 55×120×29 mm outline leaves a 32.5 mm radial section, and the 118 kN static rating is 0.86× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 10,000 r/min limiting value is the single published ceiling. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "textile machinery traverse drives",
      "gearbox shafts where one QJ locates axially in both directions beside a radial bearing",
      "screw and worm drives"
    ],
    "failure_modes": [
      "outer-ring creep and seat fretting where a N2-locating-slot bearing is not positively stopped",
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "electrical pitting on VFD-driven shafts without grounding protection",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Anti-rotation is NOT built into QJ-311-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-311-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 311 MA as the qj plain execution; the other order numbers of the QJ 311 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-311-MA?",
        "a": "QJ 311 MA measures 55 mm bore × 120 mm OD × 29 mm width (2.165 × 4.724 × 1.142 in), mass about 1750 g. SKF 17000 ratings: C 137 kN, C0 118 kN, Pu 5 kN, SKF publishes only the 10,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      },
      {
        "q": "What minimum axial load does QJ-311-MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7311-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (137/118 kN vs 79.3/55 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (137/118 kN vs 85/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (137/118 kN vs 85/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (137/118 kN vs 85/60 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (137/118 kN vs 90/65.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7311-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope, but catalogue C/C0 differ between executions (137/118 kN vs 96.5/67 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-311-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope with catalogue ratings within 10 %; QJ 311 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7311 BEP shares the 55×120×29 mm angular-contact envelope, but catalogue C/C0 differ (137/118 kN vs 79.3/55 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-311-MA",
      "QJ 311 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-212-N2PHAS",
    "brand": "SKF",
    "manufacturer_designation": "QJ 212 N2PHAS",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 96.5,
    "static_load_kN": 93,
    "fatigue_load_limit_kN": 4,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 990,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 212 N2PHAS is SKF's 60 mm-bore QJ four-point contact ball bearing of the QJ200 series, 60×110×22 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication. Envelope 60×110×22 mm (2.362×4.331×0.866 in), 25.0 mm radial section height, C 96.5 kN, C0 93 kN, Pu 4 kN.SKF publishes only the 10,000 r/min limiting speed for this execution, catalogue mass 990 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 10,000 r/min and no separate thermal reference is published; at dm ≈ 85.0 mm the corresponding dn is approximately 850k mm·r/min. Sizing arithmetic on the 60 mm bore: 96.5 kN C divided by the 25.0 mm radial section height gives 3.9 kN per section millimetre; the 990 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 110 over bore 60 is a 1.83× step for this size, and the 22 mm width gives a bore/width ratio of 2.73; use these ratios when housing space around the 60 mm shaft is the first constraint. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "screw conveyor and extruder thrust positions",
      "crane travel and hoist drives",
      "turret and slewing drives"
    ],
    "failure_modes": [
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Anti-rotation is built into QJ-212-N2PHAS: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The PHAS PEEK cage of QJ-212-N2PHAS is outer-ring-centred with lubrication grooves: feed clean oil-air or appropriate grease to the guide land and inspect groove filling at overhaul.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 212 N2PHAS as the qj slotted execution; the other order numbers of the QJ 212 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-212-N2PHAS?",
        "a": "QJ 212 N2PHAS measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 990 g. SKF 17000 ratings: C 96.5 kN, C0 93 kN, Pu 4 kN, SKF publishes only the 10,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2PHAS suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication."
      },
      {
        "q": "What minimum axial load does QJ-212-N2PHAS require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7212-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 57.2/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 69.5/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; QJ 212 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-212-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; QJ 212 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7212 BEP shares the 60×110×22 mm angular-contact envelope, but catalogue C/C0 differ (96.5/93 kN vs 57.2/45.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-212-N2PHAS",
      "QJ 212 N2PHAS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-212-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 212 N2MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 96.5,
    "static_load_kN": 93,
    "fatigue_load_limit_kN": 4,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 990,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 212 N2MA is SKF's 60 mm-bore QJ four-point contact ball bearing of the QJ200 series, 60×110×22 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 60×110×22 mm (2.362×4.331×0.866 in), 25.0 mm radial section height, C 96.5 kN, C0 93 kN, Pu 4 kN.SKF publishes only the 10,000 r/min limiting speed for this execution, catalogue mass 990 g. Selection figures for QJ 212 N2MA: the static-to-dynamic ratio C0/C is 0.96, Pu 4 kN is about 4 % of C, and catalogue mass works out to roughly 17 g per millimetre of bore. Envelope economics: the 22 mm width over a 25.0 mm section yields 0.88 mm of ring width per section millimetre, and the bearing weighs 990 g for 96.5 kN of dynamic capacity — about 10 g per rated kN. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 10,000 r/min limiting value is the single published ceiling. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "screw conveyor and extruder thrust positions",
      "crane travel and hoist drives",
      "turret and slewing drives"
    ],
    "failure_modes": [
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "outer-ring creep and seat fretting where a N2-locating-slot bearing is not positively stopped",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "brinelling from pressing the ring home through the balls or from static overload",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil"
    ],
    "pitfalls": [
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Anti-rotation is built into QJ-212-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-212-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 212 N2MA as the qj slotted execution; the other order numbers of the QJ 212 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-212-N2MA?",
        "a": "QJ 212 N2MA measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 990 g. SKF 17000 ratings: C 96.5 kN, C0 93 kN, Pu 4 kN, SKF publishes only the 10,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What does QJ mean in QJ 212 N2MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7212-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 57.2/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 69.5/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; QJ 212 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-212-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; QJ 212 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7212 BEP shares the 60×110×22 mm angular-contact envelope, but catalogue C/C0 differ (96.5/93 kN vs 57.2/45.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-212-N2MA",
      "QJ 212 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-212-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 212 MA",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 96.5,
    "static_load_kN": 93,
    "fatigue_load_limit_kN": 4,
    "limiting_speed_rpm": 10000,
    "max_rpm": 10000,
    "weight_g": 990,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 212 MA is SKF's 60 mm-bore QJ four-point contact ball bearing of the QJ200 series, 60×110×22 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 60×110×22 mm (2.362×4.331×0.866 in), 25.0 mm radial section height, C 96.5 kN, C0 93 kN, Pu 4 kN.SKF publishes only the 10,000 r/min limiting speed for this execution, catalogue mass 990 g. Sizing arithmetic on the 60 mm bore: 96.5 kN C divided by the 25.0 mm radial section height gives 3.9 kN per section millimetre; the 990 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. The 4 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 96.5/93 kN ratings and 990 g mass this execution carries about 1.61 kN of C per millimetre of bore. Bore-to-OD planning: OD 110 over bore 60 is a 1.83× step for this size, and the 22 mm width gives a bore/width ratio of 2.73; use these ratios when housing space around the 60 mm shaft is the first constraint. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "screw conveyor and extruder thrust positions",
      "crane travel and hoist drives",
      "turret and slewing drives"
    ],
    "failure_modes": [
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The MA machined brass cage is outer-ring-centred — inspect its guide clearance when servicing",
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Anti-rotation is NOT built into QJ-212-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-212-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 212 MA as the qj plain execution; the other order numbers of the QJ 212 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-212-MA?",
        "a": "QJ 212 MA measures 60 mm bore × 110 mm OD × 22 mm width (2.362 × 4.331 × 0.866 in), mass about 990 g. SKF 17000 ratings: C 96.5 kN, C0 93 kN, Pu 4 kN, SKF publishes only the 10,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      },
      {
        "q": "What does QJ mean in QJ 212 MA?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7212-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 57.2/45.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 61/50 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7212-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope, but catalogue C/C0 differ between executions (96.5/93 kN vs 69.5/56 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-212-N2PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; QJ 212 N2PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-212-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope with catalogue ratings within 10 %; QJ 212 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7212",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7212 BEP shares the 60×110×22 mm angular-contact envelope, but catalogue C/C0 differ (96.5/93 kN vs 57.2/45.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-212-MA",
      "QJ 212 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-312-N2MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 312 N2MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 156,
    "static_load_kN": 137,
    "fatigue_load_limit_kN": 5.85,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 2150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 312 N2MA is SKF's 60 mm-bore QJ four-point contact ball bearing of the QJ300 series, 60×130×31 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 60×130×31 mm (2.362×5.118×1.22 in), 35.0 mm radial section height, C 156 kN, C0 137 kN, Pu 5.85 kN.SKF publishes only the 9,000 r/min limiting speed for this execution, catalogue mass 2150 g. Mass and section check: 2150 g inside the 60×130×31 mm outline leaves a 35.0 mm radial section, and the 137 kN static rating is 0.88× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. At the printed limiting speed of 9,000 r/min the mean pitch diameter dm ≈ 95.0 mm implies a dn value around 855k mm·r/min; only the limiting speed is published for this execution. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 9,000 r/min limiting value is the single published ceiling. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "screw conveyor and extruder thrust positions",
      "crane travel and hoist drives",
      "turret and slewing drives"
    ],
    "failure_modes": [
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "raceway staining from water in the lubricant during idle periods"
    ],
    "pitfalls": [
      "Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Engage the N2 slots with housing dogs at assembly — a radially loose outer ring without positive anti-rotation creeps its seat",
      "Anti-rotation is built into QJ-312-N2MA: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The MA brass cage of QJ-312-N2MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 312 N2MA as the qj slotted execution; the other order numbers of the QJ 312 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-312-N2MA?",
        "a": "QJ 312 N2MA measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 2150 g. SKF 17000 ratings: C 156 kN, C0 137 kN, Pu 5.85 kN, SKF publishes only the 9,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      },
      {
        "q": "What minimum axial load does QJ-312-N2MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7312-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 95.6/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 116/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; QJ 312 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-312-PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; QJ 312 PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7312 BEP shares the 60×130×31 mm angular-contact envelope, but catalogue C/C0 differ (156/137 kN vs 95.6/69.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-312-N2MA",
      "QJ 312 N2MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-312-MA",
    "brand": "SKF",
    "manufacturer_designation": "QJ 312 MA",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 156,
    "static_load_kN": 137,
    "fatigue_load_limit_kN": 5.85,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 2150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 312 MA is SKF's 60 mm-bore QJ four-point contact ball bearing of the QJ300 series, 60×130×31 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls. Envelope 60×130×31 mm (2.362×5.118×1.22 in), 35.0 mm radial section height, C 156 kN, C0 137 kN, Pu 5.85 kN.SKF publishes only the 9,000 r/min limiting speed for this execution, catalogue mass 2150 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 9,000 r/min and no separate thermal reference is published; at dm ≈ 95.0 mm the corresponding dn is approximately 855k mm·r/min. Sizing arithmetic on the 60 mm bore: 156 kN C divided by the 35.0 mm radial section height gives 4.5 kN per section millimetre; the 2150 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 130 over bore 60 is a 2.17× step for this size, and the 31 mm width gives a bore/width ratio of 1.94; use these ratios when housing space around the 60 mm shaft is the first constraint. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "heavy gearbox locating positions",
      "screw conveyor and extruder thrust positions",
      "crane travel and hoist drives"
    ],
    "failure_modes": [
      "false brinelling while the shaft stands with pure radial load and no minimum axial load",
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "mounting score marks when the bearing is cocked over a burr or keyway",
      "mounting score marks when the bearing is cocked over a burr or keyway"
    ],
    "pitfalls": [
      "Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.",
      "Anti-rotation is NOT built into QJ-312-MA: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The MA brass cage of QJ-312-MA is outer-ring-centred: its guide land needs an uninterrupted oil film, so check lubricant reach when the bearing is used purely as a thrust location.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 312 MA as the qj plain execution; the other order numbers of the QJ 312 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-312-MA?",
        "a": "QJ 312 MA measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 2150 g. SKF 17000 ratings: C 156 kN, C0 137 kN, Pu 5.85 kN, SKF publishes only the 9,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the MA suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. machined brass cage, outer-ring-centred (suffix MA), which guides on the outer ring rather than on the balls."
      },
      {
        "q": "What minimum axial load does QJ-312-MA require?",
        "a": "Like angular-contact bearings the QJ needs a minimum axial load to keep the balls seated — spring preload against the outer ring is typical — and the load ratio Fa/Fr ≥ 1,27 keeps contact on one inner-ring raceway and the opposite outer-ring side."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7312-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 95.6/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 116/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; QJ 312 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-312-PHAS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; QJ 312 PHAS is the PEEK cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7312 BEP shares the 60×130×31 mm angular-contact envelope, but catalogue C/C0 differ (156/137 kN vs 95.6/69.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-312-MA",
      "QJ 312 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-312-PHAS",
    "brand": "SKF",
    "manufacturer_designation": "QJ 312 PHAS",
    "series": "QJ300-series",
    "type": "angular_contact",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 156,
    "static_load_kN": 137,
    "fatigue_load_limit_kN": 5.85,
    "limiting_speed_rpm": 9000,
    "max_rpm": 9000,
    "weight_g": 2150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 312 PHAS is SKF's 60 mm-bore QJ four-point contact ball bearing of the QJ300 series, 60×130×31 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication. Envelope 60×130×31 mm (2.362×5.118×1.22 in), 35.0 mm radial section height, C 156 kN, C0 137 kN, Pu 5.85 kN.SKF publishes only the 9,000 r/min limiting speed for this execution, catalogue mass 2150 g. Envelope economics: the 31 mm width over a 35.0 mm section yields 0.89 mm of ring width per section millimetre, and the bearing weighs 2150 g for 156 kN of dynamic capacity — about 14 g per rated kN. Selection figures for QJ 312 PHAS: the static-to-dynamic ratio C0/C is 0.88, Pu 5.85 kN is about 4 % of C, and catalogue mass works out to roughly 36 g per millimetre of bore. Speed-ratio note for this exact unit: no thermal reference speed is listed (seal/grease life governs), so the 9,000 r/min limiting value is the single published ceiling. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.",
    "applications": [
      "crane travel and hoist drives",
      "turret and slewing drives",
      "paper-machine calender stacks"
    ],
    "failure_modes": [
      "axial over-travel when the outer ring is clamped instead of left with radial clearance and a small end-play gap",
      "two-piece inner-ring separation damage if the split ring is pressed or heated unevenly during mounting",
      "outer-ring creep and seat fretting because the plain ring has no N2 slots and relies on housing-provided anti-rotation",
      "hard-particle indentation of the asymmetric raceway in unfiltered oil",
      "brinelling from pressing the ring home through the balls or from static overload"
    ],
    "pitfalls": [
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Without N2 slots, provide another positive anti-rotation feature for the radially loose outer ring",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "Anti-rotation is NOT built into QJ-312-PHAS: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.",
      "The PHAS PEEK cage of QJ-312-PHAS is outer-ring-centred with lubrication grooves: feed clean oil-air or appropriate grease to the guide land and inspect groove filling at overhaul.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 312 PHAS as the qj plain execution; the other order numbers of the QJ 312 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-312-PHAS?",
        "a": "QJ 312 PHAS measures 60 mm bore × 130 mm OD × 31 mm width (2.362 × 5.118 × 1.22 in), mass about 2150 g. SKF 17000 ratings: C 156 kN, C0 137 kN, Pu 5.85 kN, SKF publishes only the 9,000 r/min limiting speed for this execution."
      },
      {
        "q": "What does the PHAS suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication."
      },
      {
        "q": "What does QJ mean in QJ 312 PHAS?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      },
      {
        "q": "What are the N2 locating slots for?",
        "a": "The two slots, 180° apart in one outer-ring side face, engage housing dogs or pins to prevent the radially loose outer ring from creeping and fretting its seat. The non-N2 execution relies on other anti-rotation measures."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7312-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 95.6/69.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 104/76.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7312-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope, but catalogue C/C0 differ between executions (156/137 kN vs 116/85 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-312-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; QJ 312 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-312-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope with catalogue ratings within 10 %; QJ 312 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7312 BEP shares the 60×130×31 mm angular-contact envelope, but catalogue C/C0 differ (156/137 kN vs 95.6/69.5 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-312-PHAS",
      "QJ 312 PHAS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "QJ-213-N2PHAS",
    "brand": "SKF",
    "manufacturer_designation": "QJ 213 N2PHAS",
    "series": "QJ200-series",
    "type": "angular_contact",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer",
    "dynamic_load_kN": 110,
    "static_load_kN": 112,
    "fatigue_load_limit_kN": 4.75,
    "limiting_speed_rpm": 9500,
    "max_rpm": 9500,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "QJ 213 N2PHAS is SKF's 65 mm-bore QJ four-point contact ball bearing of the QJ200 series, 65×120×23 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication. Envelope 65×120×23 mm (2.559×4.724×0.906 in), 27.5 mm radial section height, C 110 kN, C0 112 kN, Pu 4.75 kN.SKF publishes only the 9,500 r/min limiting speed for this execution, catalogue mass 1200 g. The 4.75 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 110/112 kN ratings and 1200 g mass this execution carries about 1.69 kN of C per millimetre of bore. Sizing arithmetic on the 65 mm bore: 110 kN C divided by the 27.5 mm radial section height gives 4.0 kN per section millimetre; the 1200 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 120 over bore 65 is a 1.85× step for this size, and the 23 mm width gives a bore/width ratio of 2.83; use these ratios when housing space around the 65 mm shaft is the first constraint. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.",
    "applications": [
      "screw conveyor and extruder thrust positions",
      "crane travel and hoist drives",
      "turret and slewing drives"
    ],
    "failure_modes": [
      "cage wear from speed above the limiting value with thin or aged lubricant",
      "ball skidding when the Fa/Fr 1,27 load-ratio condition is not met and the balls contact both sides of one raceway",
      "locating-slot root fretting or dog wear when only one N2 notch carries the anti-rotation torque",
      "raceway staining from water in the lubricant during idle periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.",
      "Keep a small axial gap between the outer ring and the cover flange so it can accommodate thermal movement; never clamp the outer ring solid.",
      "The PHAS PEEK outer-ring-centred cage with lubrication grooves suits the highest speeds with oil-air lubrication",
      "Anti-rotation is built into QJ-213-N2PHAS: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.",
      "The PHAS PEEK cage of QJ-213-N2PHAS is outer-ring-centred with lubrication grooves: feed clean oil-air or appropriate grease to the guide land and inspect groove filling at overhaul.",
      "Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 213 N2PHAS as the qj slotted execution; the other order numbers of the QJ 213 size are different products and may carry different ratings — always quote the full designation when purchasing."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of QJ-213-N2PHAS?",
        "a": "QJ 213 N2PHAS measures 65 mm bore × 120 mm OD × 23 mm width (2.559 × 4.724 × 0.906 in), mass about 1200 g. SKF 17000 ratings: C 110 kN, C0 112 kN, Pu 4.75 kN, SKF publishes only the 9,500 r/min limiting speed for this execution."
      },
      {
        "q": "What does the N2PHAS suffix mean?",
        "a": "QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication."
      },
      {
        "q": "How is a QJ four-point bearing mounted?",
        "a": "As a thrust/locating bearing with radial clearance in the housing, paired with a separate radial bearing (commonly a cylindrical roller bearing): the QJ locates the shaft axially in both directions, the radial bearing carries radial load. Keep the outer ring unclamped with a small end-play gap; N2 slot executions use dogs to stop the outer ring turning."
      },
      {
        "q": "What does QJ mean in QJ 213 N2PHAS?",
        "a": "QJ is SKF's four-point contact design: a two-piece inner ring and gothic-arch raceways so each ball contacts at four points, giving bidirectional axial location with limited radial capacity — it must see Fa/Fr ≥ 1,27 for correct ball contact."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "7213-BEP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (110/112 kN vs 66.3/54 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213-BECBP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (110/112 kN vs 69.5/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213-BECBY",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (110/112 kN vs 69.5/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213-BEGAPH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (110/112 kN vs 69.5/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213-BECBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (110/112 kN vs 69.5/57 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "7213-ACCBM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope, but catalogue C/C0 differ between executions (110/112 kN vs 81.5/65.5 kN) — boundary dimensions match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "QJ-213-N2MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; QJ 213 N2MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "QJ-213-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope with catalogue ratings within 10 %; QJ 213 MA is the brass cage, open arrangement, four-point split-inner-ring execution of this size — boundary dimensions interchangeable, execution differs."
      },
      {
        "equiv_sku": "7213",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "SKF SKF 7213 BEP shares the 65×120×23 mm angular-contact envelope, but catalogue C/C0 differ (110/112 kN vs 66.3/54 kN) — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018)",
    "extracted_at": "2026-09-27",
    "last_verified": "2026-09-27",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "QJ-213-N2PHAS",
      "QJ 213 N2PHAS"
    ],
    "locale_variants": {}
  }
]